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  • 1.
    Bravo, Andrea G.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Bouchet, Sylvain
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Tolu, Julie
    Umea Univ, Dept Ecol & Environm Sci, SE-90187 Umea, Sweden..
    Bjorn, Erik
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Mateos-Rivera, Alejandro
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Molecular composition of organic matter controls methylmercury formation in boreal lakes2017In: Nature Communications, E-ISSN 2041-1723, Vol. 8, article id 14255Article in journal (Refereed)
    Abstract [en]

    A detailed understanding of the formation of the potent neurotoxic methylmercury is needed to explain the large observed variability in methylmercury levels in aquatic systems. While it is known that organic matter interacts strongly with mercury, the role of organic matter composition in the formation of methylmercury in aquatic systems remains poorly understood. Here we show that phytoplankton-derived organic compounds enhance mercury methylation rates in boreal lake sediments through an overall increase of bacterial activity. Accordingly, in situ mercury methylation defines methylmercury levels in lake sediments strongly influenced by planktonic blooms. In contrast, sediments dominated by terrigenous organic matter inputs have far lower methylation rates but higher concentrations of methylmercury, suggesting that methylmercury was formed in the catchment and imported into lakes. Our findings demonstrate that the origin and molecular composition of organic matter are critical parameters to understand and predict methylmercury formation and accumulation in boreal lake sediments.

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  • 2.
    Bravo, Andrea G.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Loizeau, Jean-Luc
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Dranguet, Perrine
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Makri, Stamatina
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Bjorn, Erik
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Ungureanu, Viorel Gh.
    Univ Bucharest, Fac Geol & Geophys, Bucharest, Romania.;GeoEcoMar, Natl Res & Dev Inst Marine Geol & Geoecol, Bucharest, Romania..
    Slaveykova, Vera I.
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Cosio, Claudia
    Univ Geneva, Inst FA Forel, Earth & Environm Sci, 10 Route Suisse, CH-1290 Versoix, Switzerland..
    Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)2016In: Environmental Science and Pollution Research, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 23, no 11, p. 10529-10541Article in journal (Refereed)
    Abstract [en]

    Chlor-alkali plants using mercury (Hg) cell technology are acute point sources of Hg pollution in the aquatic environment. While there have been recent efforts to reduce the use of Hg cells, some of the emitted Hg can be transformed to neurotoxic methylmercury (MeHg). Here, we aimed (i) to study the dispersion of Hg in four reservoirs located downstream of a chlor-alkali plant along the Olt River (Romania) and (ii) to track the activity of bacterial functional genes involved in Hg methylation. Total Hg (THg) concentrations in water and sediments decreased successively from the initial reservoir to downstream reservoirs. Suspended fine size particles and seston appeared to be responsible for the transport of THg into downstream reservoirs, while macrophytes reflected the local bioavailability of Hg. The concentration and proportion of MeHg were correlated with THg, but were not correlated with bacterial activity in sediments, while the abundance of hgcA transcript correlated with organic matter and Cl- concentration, indicating the importance of Hg bioavailability in sediments for Hg methylation. Our data clearly highlights the importance of considering Hg contamination as a legacy pollutant since there is a high risk of continued Hg accumulation in food webs long after Hg-cell phase out.

  • 3. Bravo, Andrea Garcia
    et al.
    Bouchet, Sylvain
    Guedron, Stephane
    Amouroux, David
    Dominik, Janusz
    Zopfi, Jakob
    High methylmercury production under ferruginous conditions in sediments impacted by sewage treatment plant discharges2015In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 80, p. 245-255Article in journal (Refereed)
    Abstract [en]

    Sewage treatment plants (STPs) are important point sources of mercury (Hg) to the environment. STPs are also significant sources of iron when hydrated ferric oxide (HFO) is used as a dephosphatation agent during water purification. In this study, we combined geochemical and microbiological characterization with Hg speciation and sediment amendments to evaluate the impact of STP's effluents on monomethylmercury (MMHg) production. The highest in-situ Hg methylation was found close to the discharge pipe in subsurface sediments enriched with Hg, organic matter, and iron. There, ferruginous conditions were prevailing with high concentrations of dissolved Fe2+ and virtually no free sulfide in the porewater. Sediment incubations demonstrated that the high MMHg production close to the discharge was controlled by low demethylation yields. Inhibition of dissimilatory sulfate reduction with molybdate led to increased iron reduction rates and Hg-methylation, suggesting that sulfate-reducing bacteria (SRB) may not have been the main Hg methylators under these conditions. However, Hg methylation in sediments amended with amorphous Fe(III)-oxides was only slightly higher than control conditions. Thus, in addition to iron-reducing bacteria, other non-SRB most likely contributed to Hg methylation. Overall, this study highlights that sediments impacted by STP discharges can become local hot-spots for Hg methylation due to the combined inputs of i) Hg, ii) organic matter, which fuels bacterial activities and iii) iron, which keeps porewater sulfide concentration low and hence Hg bioavailable.

  • 4.
    Bravo, Andrea Garcia
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab. Department of Marine Biology and Oceanography, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas, Barcelona, Catalonia, Spain.
    Peura, Sari
    Uppsala University, Science for Life Laboratory, SciLifeLab. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Osman, Omneya
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Mateos-Rivera, Alejandro
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Herrero Ortega, Sonia
    Uppsala University, Science for Life Laboratory, SciLifeLab. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Schaefer, Jeffra K.
    Bouchet, Sylvain
    Tolu, Julie
    Björn, Erik
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Methanogens and Iron-Reducing Bacteria: the Overlooked Members of Mercury-Methylating Microbial Communities in Boreal Lakes2018In: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 84, no 23, article id e01774-18Article in journal (Refereed)
    Abstract [en]

    Methylmercury is a potent human neurotoxin which biomagnifies in aquatic food webs. Although anaerobic microorganisms containing the hgcA gene potentially mediate the formation of methylmercury in natural environments, the di- versity of these mercury-methylating microbial communities remains largely unex- plored. Previous studies have implicated sulfate-reducing bacteria as the main mer- cury methylators in aquatic ecosystems. In the present study, we characterized the diversity of mercury-methylating microbial communities of boreal lake sediments us- ing high-throughput sequencing of 16S rRNA and hgcA genes. Our results show that in the lake sediments, Methanomicrobiales and Geobacteraceae also represent abun- dant members of the mercury-methylating communities. In fact, incubation experi- ments with a mercury isotopic tracer and molybdate revealed that only between 38% and 45% of mercury methylation was attributed to sulfate reduction. These re- sults suggest that methanogens and iron-reducing bacteria may contribute to more than half of the mercury methylation in boreal lakes.

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  • 5.
    Bravo, Andrea Garcia
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Zopfi, Jakob
    Aquatic and Stable Isotope Biogeochemistry, University of Basel, Basel CH-4056, Switzerland.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Jingying, Xu
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Schaefer, Jeffra K.
    Environmental Sciences, Rutgers University, New Brunswick, NJ 08901, USA.
    Poté, John
    Environmental Biogeochemistry and Ecotoxicology, University of Geneva, Geneva CH-1205, Switzerland.
    Cosio, Claudia
    Environmental Biogeochemistry and Ecotoxicology, University of Geneva, Geneva CH-1205, Switzerland.;Unité Stress Environnementaux et BIOSurveillance des Milieux Aquatiques UMR-I 02 (SEBIO), Université de Reims Champagne Ardenne, Reims F-51687, France.
    Geobacteraceae are important members of mercury-methylating microbial communities of sediments impacted by waste water releases2018In: The ISME Journal, ISSN 1751-7362, E-ISSN 1751-7370, Vol. 12, p. 802-812Article in journal (Refereed)
    Abstract [en]

    Microbial mercury (Hg) methylation in sediments can result in bioaccumulation of the neurotoxin methylmercury (MMHg) in aquatic food webs. Recently, the discovery of the gene hgcA, required for Hg methylation, revealed that the diversity of Hg methylators is much broader than previously thought. However, little is known about the identity of Hg-methylating microbial organisms and the environmental factors controlling their activity and distribution in lakes. Here, we combined high-throughput sequencing of 16S rRNA and hgcA genes with the chemical characterization of sediments impacted by a waste water treatment plant that releases significant amounts of organic matter and iron. Our results highlight that the ferruginous geochemical conditions prevailing at 1–2 cm depth are conducive to MMHg formation and that the Hgmethylating guild is composed of iron and sulfur-transforming bacteria, syntrophs, and methanogens. Deltaproteobacteria, notably Geobacteraceae, dominated the hgcA carrying communities, while sulfate reducers constituted only a minor component, despite being considered the main Hg methylators in many anoxic aquatic environments. Because iron is widely applied in waste water treatment, the importance of Geobacteraceae for Hg methylation and the complexity of Hgmethylating communities reported here are likely to occur worldwide in sediments impacted by waste water treatment plant discharges and in iron-rich sediments in general.

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  • 6.
    Catalán, Núria
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Herrero Ortega, S.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Gröntoft, H.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Hilmarsson, T. G.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Wu, Pianpian
    Levanoni, Oded
    Bishop, K.
    Garcia Bravo, Andrea
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Effects of beaver impoundments on dissolved organic matter quality and biodegradability in boreal riverine systems2017In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 793, no 1, p. 135-148Article in journal (Refereed)
    Abstract [en]

    Beaver impoundments modify the structure of river reaches and lead to changes in ecosystem function and biogeochemical processes. Here, we assessed the changes in dissolved organic matter (DOM) quality and the biodegradation patterns in a set of beaver systems across Sweden. As the effect of beaver impoundments might be transient and local, we compared DOM quality and biodegradability of both pond and upstream sections of differentially aged beaver systems. Newly established dams shifted the sources and DOM biodegradability patterns. In particular, humic-like DOM, most likely leached from surrounding soils, characterized upstream sections of new beaver impoundments. In contrast, autochthonous and processed compounds, with both higher biodegradation rates and a broader spectrum of reactivities, differentiated DOM in ponds. DOM in recently established ponds seemed to be more humic and less processed compared to older ponds, but system idiosyncrasies determined by catchment particularities influenced this ageing effect.

  • 7. Dominik, Janusz
    et al.
    Tagliapietra, Davide
    Garcia Bravo, Andrea G.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Sigovini, Marco
    Spangenberg, Jorge E.
    Amouroux, David
    Zonta, Roberto
    Mercury in the food chain of the Lagoon of Venice, Italy2014In: Marine Pollution Bulletin, ISSN 0025-326X, E-ISSN 1879-3363, Vol. 88, no 1-2, p. 194-206Article in journal (Refereed)
    Abstract [en]

    Sediments and biota samples were collected in a restricted area of the Lagoon of Venice and analysed for total mercury, monomethyl mercury (MMHg), and nitrogen and carbon isotopes. Results were used to examine mercury biomagnification in a complex food chain. Sedimentary organic matter (SOM) proved to be a major source of nutrients and mercury to primary consumers. Contrary to inorganic mercury, MMHg was strongly biomagnified along the food chain, although the lognormal relationship between MMHg and δ15N was less constrained than generally reported from lakes or coastal marine ecosystems. The relationship improved when log MMHg concentrations were plotted against trophic positions derived from baseline δ15N estimate for primary consumers. From the regression slope a mean MMHg trophic magnification factor of 10 was obtained. Filter-feeding benthic bivalves accumulated more MMHg than other primary consumers and were probably important in MMHg transfer from sediments to higher levels of the food chain.

  • 8.
    Donis, Daphne
    et al.
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, Geneva, Switzerland.;Univ Geneva, Inst Environm Sci, Geneva, Switzerland..
    Mantzouki, Evanthia
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, Geneva, Switzerland.;Univ Geneva, Inst Environm Sci, Geneva, Switzerland..
    McGinnis, Daniel F.
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, Geneva, Switzerland.;Univ Geneva, Inst Environm Sci, Geneva, Switzerland..
    Vachon, Dominic
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, Geneva, Switzerland.;Univ Geneva, Inst Environm Sci, Geneva, Switzerland.;Umeå Univ, Dept Ecol & Environm Sci, Umeå, Sweden..
    Gallego, Irene
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, Geneva, Switzerland.;Univ Geneva, Inst Environm Sci, Geneva, Switzerland.;Eawag, Dept Aquat Ecol, Uberlandstr, Dubendorf, Switzerland..
    Grossart, Hans-Peter
    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, Stechlin, Germany.;Potsdam Univ, Inst Biochem & Biol, Potsdam, Germany..
    Domis, Lisette N. de Senerpont
    Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, Wageningen, Netherlands.;Wageningen Univ, Dept Environm Sci, Aquat Ecol & Water Qual Management Grp, NL-6708 PB Wageningen, Netherlands..
    Teurlincx, Sven
    Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, Wageningen, Netherlands..
    Seelen, Laura
    Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, Wageningen, Netherlands.;Wageningen Univ, Dept Environm Sci, Aquat Ecol & Water Qual Management Grp, NL-6708 PB Wageningen, Netherlands..
    Lurling, Miquel
    Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, Wageningen, Netherlands.;Wageningen Univ & Res, Dept Environm Sci, Wageningen, Netherlands..
    Verstijnen, Yvon
    Wageningen Univ & Res, Dept Environm Sci, Wageningen, Netherlands..
    Maliaka, Valentini
    Wageningen Univ & Res, Dept Environm Sci, Wageningen, Netherlands.;Soc Protect Prespa, Agios Germanos, Greece.;Radboud Univ Nijmegen, Inst Water & Wetland Res, Dept Aquat Ecol & Environm Biol, Nijmegen, Netherlands..
    Fonvielle, Jeremy
    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, Stechlin, Germany..
    Visser, Petra M.
    Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, Dept Freshwater & Marine Ecol, Amsterdam, Netherlands..
    Verspagen, Jolanda
    Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, Dept Freshwater & Marine Ecol, Amsterdam, Netherlands..
    van Herk, Maria
    Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, Dept Freshwater & Marine Ecol, Amsterdam, Netherlands..
    Antoniou, Maria G.
    Cyprus Univ Technol, Dept Chem Engn, Lemesos, Cyprus..
    Tsiarta, Nikoletta
    Cyprus Univ Technol, Dept Chem Engn, Lemesos, Cyprus..
    McCarthy, Valerie
    Dundalk Inst Technol, Ctr Freshwater & Environm Studies, Dundalk, Ireland..
    Perello, Victor C.
    Dundalk Inst Technol, Ctr Freshwater & Environm Studies, Dundalk, Ireland..
    Machado-Vieira, Danielle
    Univ Fed Paraiba, Dept Sistemat & Ecol, Joao Pessoa, Paraiba, Brazil..
    de Oliveira, Alinne Gurjao
    Univ Fed Paraiba, Dept Sistemat & Ecol, Joao Pessoa, Paraiba, Brazil..
    Maronic, Dubravka Spoljaric
    Josip Juraj Strossmayer Univ Osijek, Dept Biol, Osijek, Croatia..
    Stevic, Filip
    Josip Juraj Strossmayer Univ Osijek, Dept Biol, Osijek, Croatia..
    Pfeiffer, Tanja Zuna
    Josip Juraj Strossmayer Univ Osijek, Dept Biol, Osijek, Croatia..
    Vucelic, Itana Bokan
    Teaching Inst Publ Hlth Primorje Gorski Kotar Cty, Dept Ecotoxicol, Rijeka, Croatia..
    Zutinic, Petar
    Univ Zagreb, Fac Sci, Dept Biol, Zagreb, Croatia..
    Udovic, Marija Gligora
    Univ Zagreb, Fac Sci, Dept Biol, Zagreb, Croatia..
    Blaha, Ludek
    Masaryk Univ, Fac Sci, RECETOX, Brno, Czech Republic..
    GeriS, Rodan
    Morava Board Author, Dept Hydrobiol, Brno, Czech Republic..
    Fankova, Marketa
    Czech Acad Sci, Inst Bot, Dept Paleoecol, Brno, Czech Republic..
    Christoffersen, Kirsten Seestern
    Univ Copenhagen, Dept Biol, Freshwater Biol Lab, Copenhagen, Denmark..
    Warming, Trine Perlt
    Univ Copenhagen, Dept Biol, Freshwater Biol Lab, Copenhagen, Denmark..
    Feldmann, Tonu
    Estonian Univ Life Sci, Inst Agr & Environm Sci, Tartu, Estonia..
    Laas, Alo
    Estonian Univ Life Sci, Inst Agr & Environm Sci, Tartu, Estonia..
    Panksep, Kristel
    Estonian Univ Life Sci, Inst Agr & Environm Sci, Tartu, Estonia..
    Tuvikene, Lea
    Estonian Univ Life Sci, Inst Agr & Environm Sci, Tartu, Estonia..
    Kangro, Kersti
    Estonian Univ Life Sci, Inst Agr & Environm Sci, Tartu, Estonia.;Univ Tartu, Fac Sci & Technol, Tartu Observ, Tartu, Estonia..
    Koreiviene, Judita
    Nat Res Ctr, Inst Bot, Vilnius, Lithuania..
    Karosiene, Jurate
    Nat Res Ctr, Inst Bot, Vilnius, Lithuania..
    Kasperoviciene, Jurate
    Nat Res Ctr, Inst Bot, Vilnius, Lithuania..
    Savadova-Ratkus, Ksenija
    Nat Res Ctr, Inst Bot, Vilnius, Lithuania..
    Vitonyte, Irma
    Nat Res Ctr, Inst Bot, Vilnius, Lithuania..
    Haggqvist, Kerstin
    Abo Akad Univ, Dept Sci & Engn, Turku, Finland..
    Salmi, Pauliina
    Univ Jyvaskyla, Dept Biol & Environm Sci, Jyvaskyla, Finland..
    Arvola, Lauri
    Univ Helsinki, Lammi Biol Stn, Lammi, Finland..
    Rothhaupt, Karl
    Univ Konstanz, Limnol Inst, Dept Biol, Constance, Germany..
    Avagianos, Christos
    Athens Water Supply & Sewerage Co, Water Qual Dept, Athens, Greece..
    Kaloudis, Triantafyllos
    Athens Water Supply & Sewerage Co, Water Qual Dept, Athens, Greece..
    Gkelis, Spyros
    Aristotle Univ Thessaloniki, Sch Biol, Dept Bot, Thessaloniki, Greece..
    Panou, Manthos
    Aristotle Univ Thessaloniki, Sch Biol, Dept Bot, Thessaloniki, Greece..
    Triantis, Theodoros
    Natl Ctr Sci Res DEMOKRITOS, Inst Nanosci & Nanotechnol, Athens, Greece..
    Zervou, Sevasti-Kiriaki
    Natl Ctr Sci Res DEMOKRITOS, Inst Nanosci & Nanotechnol, Athens, Greece..
    Hiskia, Anastasia
    Natl Ctr Sci Res DEMOKRITOS, Inst Nanosci & Nanotechnol, Athens, Greece..
    Obertegger, Ulrike
    Fdn Edmund Mach, Res & Innovat Ctr, I-38010 San Michele All Adige, Italy..
    Boscaini, Adriano
    Fdn Edmund Mach, Res & Innovat Ctr, I-38010 San Michele All Adige, Italy..
    Flaim, Giovanna
    Fdn Edmund Mach, Res & Innovat Ctr, I-38010 San Michele All Adige, Italy..
    Salmaso, Nico
    Fdn Edmund Mach, Res & Innovat Ctr, I-38010 San Michele All Adige, Italy..
    Cerasino, Leonardo
    Fdn Edmund Mach, Res & Innovat Ctr, I-38010 San Michele All Adige, Italy..
    Haande, Sigrid
    Norwegian Inst Water Res, Dept Freshwater Ecol, Oslo, Norway..
    Skjelbred, Birger
    Norwegian Inst Water Res, Dept Freshwater Ecol, Oslo, Norway..
    Grabowska, Magdalena
    Univ Bialystok, Dept Hydrobiol, Bialystok, Poland..
    Karpowicz, Maciej
    Univ Bialystok, Dept Hydrobiol, Bialystok, Poland..
    Chmura, Damian
    Univ Bielsko Biala, Inst Environm Protect & Engn, Bielsko Biala, Poland..
    Nawrocka, Lidia
    State Univ Appl Sci, Inst Technol, Elblag, Poland..
    Kobos, Justyna
    Univ Gdansk, Dept Marine Biotechnol, Gdynia, Poland..
    Mazur-Marzec, Hanna
    Univ Gdansk, Dept Marine Biotechnol, Gdynia, Poland..
    Alcaraz-Parraga, Pablo
    Univ Jaen, Dept Anim Biol Plant Biol & Ecol, Jaen, Spain..
    Wilk-Wozniak, Elzbieta
    Polish Acad Sci, Inst Nat Conservat, Krakow, Poland..
    Krzton, Wojciech
    Polish Acad Sci, Inst Nat Conservat, Krakow, Poland..
    Walusiak, Edward
    Polish Acad Sci, Inst Nat Conservat, Krakow, Poland..
    Gagala-Borowska, Ilona
    Polish Acad Sci, European Reg Ctr Ecohydrol, Lodz, Poland..
    Mankiewicz-Boczek, Joana
    Polish Acad Sci, European Reg Ctr Ecohydrol, Lodz, Poland..
    Toporowska, Magdalena
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, Lublin, Poland..
    Pawlik-Skowronska, Barbara
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, Lublin, Poland..
    Niedzwiecki, Michal
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, Lublin, Poland..
    Napiorkowska-Krzebietke, Agnieszka
    S Sakowicz Inland Fisheries Inst, Dept Ichthyol Hydrobiol & Aquat Ecol, PL-10719 Olsztyn, Poland..
    Dunalska, Julita
    Univ Warmia & Mazury, Dept Water Protect Engn, Olsztyn, Poland..
    Sienska, Justyna
    Univ Warmia & Mazury, Dept Water Protect Engn, Olsztyn, Poland..
    Szymanski, Daniel
    Univ Warmia & Mazury, Dept Water Protect Engn, Olsztyn, Poland..
    Kruk, Marek
    Univ Warmia & Mazury, Dept Appl Comp Sci & Math Modelling, PL-10710 Olsztyn, Poland..
    Budzynska, Agnieszka
    Adam Mickiewicz Univ, Fac Biol, Dept Water Protect, Poznan, Poland..
    Goldyn, Ryszard
    Adam Mickiewicz Univ, Fac Biol, Dept Water Protect, Poznan, Poland..
    Kozak, Anna
    Adam Mickiewicz Univ, Fac Biol, Dept Water Protect, Poznan, Poland..
    Rosinska, Joanna
    Adam Mickiewicz Univ, Fac Biol, Dept Water Protect, Poznan, Poland..
    Domek, Piotr
    Adam Mickiewicz Univ, Fac Biol, Dept Water Protect, Poznan, Poland..
    Jakubowska-Krepska, Natalia
    Adam Mickiewicz Univ, Fac Biol, Dept Water Protect, Poznan, Poland..
    Kwasizur, Kinga
    Adam Mickiewicz Univ, Fac Biol, Dept Hydrobiol, Poznan, Poland..
    Messyasz, Beata
    Adam Mickiewicz Univ, Fac Biol, Dept Hydrobiol, Poznan, Poland..
    Kokocinski, Mikolaj
    Adam Mickiewicz Univ, Fac Biol, Dept Hydrobiol, Poznan, Poland..
    Madrecka-Witkowska, Beata
    Poznan Univ Tech, Fac Environm Engn & Energy, Inst Environm Engn & Bldg Installat, PL-60965 Poznan, Poland..
    Kostrzewska-Szlakowska, Iwona
    Univ Warsaw, Fac Biol, Warsaw, Poland..
    Frak, Magdalena
    Warsaw Univ Life Sci SGGW, Inst Environm Engn, Dept Remote Sensing & Environm Assessment, Nowoursynowska Str 166, PL-02787 Warsaw, Poland..
    Bankowska-Sobczak, Agnieszka
    Warsaw Univ Life Sci SGGW, Fac Civil & Environm Engn, Dept Water Engn & Appl Geol, PL-02787 Warsaw, Poland..
    Wasilewicz, Michal
    Warsaw Univ Life Sci SGGW, Fac Civil & Environm Engn, Dept Water Engn & Appl Geol, PL-02787 Warsaw, Poland..
    Ochocka, Agnieszka
    Inst Environm Protect, Dept Freshwater Protect, Natl Res Inst, Warsaw, Poland..
    Pasztaleniec, Agnieszka
    Inst Environm Protect, Dept Freshwater Protect, Natl Res Inst, Warsaw, Poland..
    Jasser, Iwona
    Univ Warsaw, Fac Biol, Dept Plant Ecol & Environm Conservat, PL-02089 Warsaw, Poland..
    Antao-Geraldes, Ana M.
    Inst Politecn Braganca, Ctr Invest Montanha CIMO, Braganca, Portugal..
    Leira, Manel
    Univ A Coruna, Fac Sci, BioCost Res Grp, La Coruna 15071, Spain.;Univ A Coruna, Fac Sci, Dept Biol, Ctr Invest Cient Avanzadas CICA, La Coruna 15071, Spain..
    Vasconcelos, Vitor
    Univ Porto, Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal..
    Morais, Joao
    Univ Porto, Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal..
    Vale, Micaela
    Univ Porto, Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal..
    Raposeiro, Pedro M.
    Univ Azores, Fac Sci & Technol, Res Ctr Biodivers & Genet Resources CIBIO Azores, InBIO Associated Lab, P-9500321 Ponta Delgada, Portugal..
    Goncalves, Vitor
    Univ Azores, Fac Sci & Technol, Res Ctr Biodivers & Genet Resources CIBIO Azores, InBIO Associated Lab, P-9500321 Ponta Delgada, Portugal..
    Aleksovski, Boris
    SS Cyril & Methodius Univ, Fac Nat Sci & Math, Skopje, North Macedonia..
    Krstic, Svetislav
    SS Cyril & Methodius Univ, Fac Nat Sci & Math, Skopje, North Macedonia..
    Nemova, Hana
    Publ Hlth Author Slovak Republ, Natl Reference Ctr Hydrobiol, Bratislava, Slovakia..
    Drastichova, Iveta
    Publ Hlth Author Slovak Republ, Natl Reference Ctr Hydrobiol, Bratislava, Slovakia..
    Chomova, Lucia
    Publ Hlth Author Slovak Republ, Natl Reference Ctr Hydrobiol, Bratislava, Slovakia..
    Remec-Rekar, Spela
    Slovenian Environm Agcy, Dept Water Qual, Ljubljana, Slovenia..
    Elersek, Tina
    Natl Inst Biol, Dept Genet Toxicol & Canc Biol, Ljubljana, Slovenia..
    Hansson, Lars-Anders
    Lund Univ, Dept Biol, Lund, Sweden..
    Urrutia Cordero, Pablo
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Lund Univ, Dept Biol, Lund, Sweden..
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Colom-Montero, William
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Mustonen, Kristiina
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Pierson, Don
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Yang, Yang
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Richardson, Jessica
    Univ Stirling, Dept Biol & Environm Sci, Stirling, Scotland..
    Edwards, Christine
    Robert Gordon Univ, Sch Pharm & Life Sci, Aberdeen, Scotland..
    Cromie, Hannah
    Agrifood & Biosci Inst, Belfast, Antrim, North Ireland..
    Delgado-Martin, Jordi
    Univ A Coruna, Dept Civil Engn, La Coruna, Spain..
    Garcia, David
    Univ A Coruna, Dept Civil Engn, La Coruna, Spain..
    Luis Cereijo, Jose
    Univ A Coruna, Dept Civil Engn, La Coruna, Spain..
    Goma, Joan
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, Barcelona, Spain..
    Carmen Trapote, Mari
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, Barcelona, Spain..
    Vegas-Vilarrubia, Teresa
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, Barcelona, Spain..
    Obrador, Biel
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, Barcelona, Spain..
    Garcia-Murcia, Ana
    AECOM URS, Dept Limnol & Water Qual, Barcelona, Spain..
    Real, Monserrat
    AECOM URS, Dept Limnol & Water Qual, Barcelona, Spain..
    Romans, Elvira
    AECOM URS, Dept Limnol & Water Qual, Barcelona, Spain..
    Noguero-Ribes, Jordi
    AECOM URS, Dept Limnol & Water Qual, Barcelona, Spain..
    Duque, David Parreno
    AECOM URS, Dept Limnol & Water Qual, Barcelona, Spain..
    Fernandez-Moran, Elisabeth
    AECOM URS, Dept Limnol & Water Qual, Barcelona, Spain..
    Ubeda, Barbara
    Univ Cadiz, INMAR Marine Res Inst, Dept Biol, Puerto Real 11510, Spain..
    Galvez, Jose Angel
    Univ Cadiz, INMAR Marine Res Inst, Dept Biol, Puerto Real 11510, Spain..
    Catalan, Nuria
    Catalan Inst Water Res ICRA, Girona, Spain..
    Perez-Martinez, Carmen
    Univ Granada, Dept Ecol, Granada, Spain.;Univ Granada, Inst Water Res, Granada, Spain..
    Ramos-Rodriguez, Eloisa
    Univ Granada, Dept Ecol, Granada, Spain.;Univ Granada, Inst Water Res, Granada, Spain..
    Cillero-Castro, Carmen
    3Edata, R&D Dept Environm Engn, Lugo, Spain..
    Moreno-Ostos, Enrique
    Univ Malaga, Dept Ecol, Malaga, Spain..
    Maria Blanco, Jose
    Univ Malaga, Dept Ecol, Malaga, Spain..
    Rodriguez, Valeriano
    Univ Malaga, Dept Ecol, Malaga, Spain..
    Juan Montes-Perez, Jorge
    Univ Malaga, Dept Ecol, Malaga, Spain..
    Palomino, Roberto L.
    Univ Malaga, Dept Ecol, Malaga, Spain..
    Rodriguez-Perez, Estela
    Univ Malaga, Dept Ecol, Malaga, Spain..
    Hernandez, Armand
    CSIC, Inst Earth Sci Jaume Almera, ICTJA, Barcelona, Spain..
    Carballeira, Rafael
    Univ A Coruna, Fac Ciencias, Ctr Invest Cient Avanzadas CICA, La Coruna, Spain..
    Camacho, Antonio
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Valencia, Spain..
    Picazo, Antonio
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Valencia, Spain..
    Rochera, Carlos
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Valencia, Spain..
    Santamans, Anna C.
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Valencia, Spain..
    Ferriol, Carmen
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Valencia, Spain..
    Romo, Susana
    Univ Valencia, Dept Microbiol & Ecol, Burjassot, Spain..
    Miguel Soria, Juan
    Univ Valencia, Dept Microbiol & Ecol, Burjassot, Spain..
    Ozen, Arda
    Univ Cankiri Karatekin, Dept Forest Engn, Cankiri, Turkey..
    Karan, Tunay
    Yozgat Bozok Univ, Fac Vet Med, Dept Anim Nutr & Zootech, Yozgat, Turkey..
    Demir, Nilsun
    Ankara Univ, Dept Fisheries & Aquaculture Engn, TR-06110 Ankara, Turkey..
    Beklioglu, Meryem
    Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Ankara, Turkey..
    Filiz, Nur
    Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Ankara, Turkey..
    Levi, Eti
    Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Ankara, Turkey..
    Iskin, Ugur
    Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Ankara, Turkey..
    Bezirci, Gizem
    Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Ankara, Turkey..
    Tavsanoglu, Ulku Nihan
    Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Ankara, Turkey..
    Celik, Kemal
    Balikesir Univ, Dept Biol, Balikesir, Turkey..
    Ozhan, Koray
    Middle East Tech Univ, Inst Marine Sci, Dept Oceanog, Ankara, Turkey..
    Karakaya, Nusret
    Abant Izzet Baysal Univ, Dept Environm Engn, Bolu, Turkey..
    Kocer, Mehmet Ali Turan
    Mediterranean Fisheries Res Prod & Training Inst, Dept Environm & Resource Management, Antalya, Turkey..
    Yilmaz, Mete
    Bursa Tech Univ, Dept Bioengn, Bursa, Turkey..
    Maraslioglu, Faruk
    Hitit Univ, Dept Biol, Corum, Turkey..
    Soylu, Elif Neyran
    Giresun Univ, Dept Biol, Giresun, Turkey..
    Fakioglu, Ozden
    Ataturk Univ, Dept Basic Sci, Erzurum, Turkey..
    Yagci, Meral Apaydin
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Cinar, Sakir
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Capkin, Kadir
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Yagci, Abdulkadir
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Cesur, Mehmet
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Bilgin, Fuat
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Bulut, Cafer
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Uysal, Rahmi
    Republ Turkey Minist Food Agr, Fisheries Res Inst, Isparta, Turkey..
    Latife, Koker
    Istanbul Univ, Fac Aquat Sci, Dept Freshwater Resource & Management, Istanbul, Turkey..
    Akcaalan, Reyhan
    Istanbul Univ, Fac Aquat Sci, Dept Freshwater Resource & Management, Istanbul, Turkey..
    Albay, Meric
    Istanbul Univ, Fac Aquat Sci, Dept Freshwater Resource & Management, Istanbul, Turkey..
    Alp, Mehmet Tahir
    Mersin Univ, Fac Aquaculture, Mersin, Turkey..
    Ozkan, Korhan
    Middle East Tech Univ, Inst Marine Sci Marine Biol & Fisheries, Mersin, Turkey..
    Sevindik, Tugba Ongun
    Sakarya Univ, Dept Biol, Sakarya, Turkey..
    Tunca, Hatice
    Sakarya Univ, Dept Biol, Sakarya, Turkey..
    Onem, Burcin
    Sakarya Univ, Dept Biol, Sakarya, Turkey..
    Paerl, Hans
    Univ N Carolina, Inst Marine Sci, Chapel Hill, NC USA..
    Carey, Cayelan C.
    Virginia Tech, Dept Biol Sci, Blacksburg, VA USA..
    Ibelings, Bastiaan W.
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, Geneva, Switzerland.;Univ Geneva, Inst Environm Sci, Geneva, Switzerland..
    Stratification strength and light climate explain variation in chlorophyll a at the continental scale in a European multilake survey in a heatwave summer2021In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 66, no 12, p. 4314-4333Article in journal (Refereed)
    Abstract [en]

    To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L-1), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chlorophyll a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the warmest yet most weakly stratified and had significantly less Chl a than Boreal lakes, where the temperature anomaly from the long-term average, during a summer heatwave was the highest (+4 degrees C) and showed a significant, exponential relationship with stratification strength. This European survey represents a summer snapshot of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both affected by climate change, are better predictors for phytoplankton biomass in nutrient-rich lakes than nutrient concentrations and surface temperature.

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  • 9.
    Eklöf, Karin
    et al.
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, SE-75007 Uppsala, Sweden.
    Bishop, Kevin
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, SE-75007 Uppsala, Swede.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Björn, Erik
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Umea Univ, Dept Chem, SE-90187 Umea, Sweden.; National Bioinformatics Infrastructure Sweden, Uppsala SE-75236, Sweden.
    Skyllberg, Ulf
    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden.
    Osman, Omneya
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Kronberg, Rose Marie
    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Formation of mercury methylation hotspots as a consequence of forestry operations2018In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 613-614, p. 1069-1078Article in journal (Refereed)
    Abstract [en]

    Earlier studies have shown that boreal forest logging can increase the concentration and export of methylmercury (MeHg) in stream runoff. Here we test whether forestry operations create soil environments of high MeHg net formation associated with distinct microbial communities. Furthermore, we test the hypothesis that Hg methylation hotspots are more prone to form after stump harvest than stem-only harvest, because of more severe soil compaction and soil disturbance. Concentrations of MeHg, percent MeHg of total Hg (THg), and bacterial community composition were determined at 200 soil sampling positions distributed across eight catchments. Each catchment was either stem-only harvested (n = 3), stem- and stump-harvested (n = 2) or left undisturbed (n = 3). In support of our hypothesis, higher MeHg to THg ratios was observed in one of the stump-harvested catchments. While the effects of natural variation could not be ruled out, we noted that most of the highest % MeHg was observed in water-filled cavities created by stump removal or driving damage. This catchment also featured the highest bacterial diversity and highest relative abundance of bacterial families known to include Hg methylators. We propose that water-logged and disturbed soil environments associated with stump harvest can favor methylating microorganisms, which also enhance MeHg formation.

  • 10.
    Garcia Bravo, Andrea
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Cosio, Claudia
    Amouroux, David
    Zopfi, Jakob
    Chevalley, Pierre-Alain
    Spangenberg, Jorge E.
    Ungureanu, Viorel-Gheorghe
    Dominik, Janusz
    Extremely elevated methyl mercury levels in water, sediment and organisms in a Romanian reservoir affected by release of mercury from a chlor-alkali plant2014In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 49, p. 391-405Article in journal (Refereed)
    Abstract [en]

    We examined mercury (Hg) biogeochemistry and biomagnification in the Babeni Reservoir, a system strongly affected by the release of Hg from a chlor-alkali plant. Total mercury (THg) concentrations in river water reached 88 ng L−1 but decreased rapidly in the reservoir (to 9 ng L−1). In contrast, monomethylmercury (MMHg) concentrations increased from the upstream part of the reservoir to the central part (0.7 ng L−1), suggesting high methylation within the reservoir. Moreover, vertical water column profiles of THg and MMHg indicated that Hg methylation mainly occurred deep in the water column and at the sediment–water interface. The discharge of Hg from a chlor-alkali plant in Valcea region caused the highest MMHg concentrations ever found in non-piscivorous fish worldwide. MMHg concentrations and bioconcentration factors (BCF) of plankton and macrophytes revealed that the highest biomagnification of MMHg takes place in primary producers.

  • 11.
    Garcia Bravo, Andrea
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    LeFaucheur, S.
    Monperrus, M.
    Slaveykova, V.
    Species-specific isotope tracers to study the accumulation and biotransformation of mixtures of inorganic and methyl mercury by the microalga Chlamydomonas reinhardtii2014In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 192, p. 212-215Article in journal (Refereed)
    Abstract [en]

    The present study demonstrates that species-specific isotope tracing is an useful tool to precisely measure Hg accumulation and transformations capabilities of living organisms at concentrations naturally encountered in the environment. To that end, a phytoplanktonic green alga Chlamydomonas reinhardtii Dangeard (Chlamydomonadales, Chlorophyceae) was exposed to mixtures of (199)-isotopically enriched inorganic mercury ((IHg)-I-199) and of (201)-isotopically enriched monomethylmercury ((CH3Hg)-C-201) at a concentration range between less than 1 pM to 4 nM. Additionally, one exposure concentration of both mercury species was also studied separately to evaluate possible interactive effects. No difference in the intracellular contents was observed for algae exposed to (IHg)-I-199 and (CH3Hg)-C-201 alone or in their mixture, suggesting similar accumulation capacity for both species at the studied concentrations. Demethylation of (CH3Hg)-C-201 was observed at the highest exposure concentrations, whereas no methylation was detected.

  • 12. Gascon Diez, Elena
    et al.
    Garcia Bravo, Andrea
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    à Porta, Natacha
    Masson, Matthieu
    Graham, Neil D.
    Stoll, Serge
    Akhtman, Yosef
    Amouroux, David
    Loizeau, Jean-Luc
    Influence of a wastewater treatment plant on mercury contamination and sediment characteristics in Vidy Bay (Lake Geneva, Switzerland)2014In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 76, no S1, p. S21-S32Article in journal (Refereed)
    Abstract [en]

    Previous direct observations of the sediment surface in Vidy Bay, Lake Geneva (Switzerland), revealed a range of sediment characteristics in terms of colour, texture and morphology. Dives with the MIR submersibles during the éLEMO project permitted the exploration of a large portion of Vidy Bay. It is the most contaminated part of Lake Geneva, due to inputs of treated and untreated waters from a large wastewater treatment plant (WWTP). To evaluate the influence of WWTP effluent on mercury contamination and sediment characteristics, 14 sediment cores were retrieved in the vicinity of the wastewater treatment plant effluent. Total mercury concentrations in sediments ranged between 0.32 and 10.1 mg/kg. Inorganic mercury and monomethylmercury concentrations in overlying and pore waters were also measured. The total partition coefficients of mercury (logK d) ranged from 3.6 to 5.8. The monomethylmercury concentration in pore waters of surface sediments was a large proportion of the total mercury concentration (44 ± 25 %). A Spearman test showed a negative correlation between the distance to the wastewater treatment plant outlet and the concentrations of total mercury in sediments and pore waters. Visual observations from the submersible allowed recognizing six different types of sediment. The areal distribution of these different sediment types clearly showed the influence of the wastewater treatment plant outlet on the sediment surface patterns. However, no relationship with mercury concentrations could be established.

  • 13.
    Gascon Diez, Elena
    et al.
    Univ Geneva, Dept FA Forel Environm & Water Sci, Blvd Carl Vogt 66, CH-1211 Geneva 4, Switzerland.
    Loizeau, Jean-Luc
    Univ Geneva, Dept FA Forel Environm & Water Sci, Blvd Carl Vogt 66, CH-1211 Geneva 4, Switzerland.
    Cosio, Claudia
    Univ Geneva, Dept FA Forel Environm & Water Sci, Blvd Carl Vogt 66, CH-1211 Geneva 4, Switzerland.
    Bouchet, Sylvain
    Univ Pau & Pays Adour, Lab Chim Analyt Bioinorgan & Environm, Inst Sci Analyt & Physicochim Environm & Mat, CNRS,UMR 5254, Helioparc, F-64053 Pau, France.
    Adatte, Thierry
    Univ Lausanne, Inst Earth Sci ISTE, CH-1015 Lausanne, Switzerland.
    Amouroux, David
    Univ Pau & Pays Adour, Lab Chim Analyt Bioinorgan & Environm, Inst Sci Analyt & Physicochim Environm & Mat, CNRS,UMR 5254, Helioparc, F-64053 Pau, France.
    Bravo, Andrea G.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Role of settling particles on mercury methylation in the oxic water 1 column of freshwater systems2016In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 50, no 21, p. 11672-11679Article in journal (Refereed)
    Abstract [en]

    As the methylation of inorganic divalent mercury (HgII) to neurotoxic methylmercury (MeHg) has been attributed to the activity of anaerobic bacteria, the formation of MeHg in the oxic water column of marine ecosystems has puzzled scientists over the past years. Here we show for the first time that MeHg can be produced in particles sinking through oxygenated water column of lakes. Total mercury (THg) and MeHg concentrations were measured in settling particles and in surface sediments of the largest freshwater lake in Western Europe (Lake Geneva). Whilst THg concentration differences between sediments and settling particles were not significant, MeHg concentrations were up to ten-fold greater in settling particles. MeHg demethylation rate constants (kd) were of similar magnitude in both compartments. In contrast, Hg methylation rate constants (km) were one order of magnitude greater in settling particles. The net potential for MeHg formation, assessed by the ratio between the two rate constants (km kd-1), was therefore up to ten times higher in settling particles, denoting that in situ transformations likely contributed to the high MeHg concentrations found in settling particles. Hg methylation was inhibited ( 80 %) in settling particles amended with molybdate, demonstrating the prominent role of biological sulfate-reduction in the process.

  • 14.
    Habiba, G.
    et al.
    Univ Addis Ababa, Ethiopian Inst Water Resources, Addis Ababa, Ethiopia.
    Abebe, G.
    Univ Addis Ababa, Dept Zool Sci, Addis Ababa, Ethiopia.
    Bravo, Andrea G.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Ermias, D.
    Hawassa Univ, Addis Ababa, Ethiopia.
    Staffan, Ǻ.
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Bishop, Kevin
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Mercury Human Exposure in Populations Living Around Lake Tana (Ethiopia)2017In: Biological Trace Element Research, ISSN 0163-4984, E-ISSN 1559-0720, Vol. 175, no 2, p. 237-243Article in journal (Refereed)
    Abstract [en]

    A survey carried out in Lake Tana in 2015 found that Hg levels in some fish species exceeded internationally accepted safe levels for fish consumption. The current study assesses human exposure to Hg through fish consumption around the Lake Tana. Of particular interest was that a dietary intake of fishes is currently a health risk for Bihar Dar residents and anglers. Hair samples were collected from three different groups: anglers, college students and teachers, and daily laborers. A questionary includes gender, age, weight, activity. Frequency of fish consumption and origin of the eaten fish were completed by each participant. Mercury concentrations in hair were significantly higher (P value <0.05) for anglers (mean ± standard deviation 0.120 ± 0.199 μg/g) than college students (mean ± standard deviation 0.018 ± 0.039 μg/g) or daily workers (mean ± standard deviation 16 ± 9.5 ng/g). Anglers consumed fish more often than daily workers and college group. Moreover, there was also a strong correlation (P value <0.05) between the logarithms of total mercury and age associated with mercury concentration in scalp hair. Mercury concentrations in the hair of men were on average twice the value of the women. Also, users of skin lightening soap on a daily basis had 2.5 times greater mercury in scalp hair than non-users. Despite the different sources of mercury exposure mentioned above, the mercury concentrations of the scalp hair of participants of this study were below levels deemed to pose a threat to health.

  • 15.
    Herrero Ortega, Sonia
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab. Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Expt Limnol, Stechlin, Germany.
    Catalán, Núria
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab. Catalan Inst Water Res ICRA, Girona, Spain.
    Björn, Erik
    Gröntoft, Hannes
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Hilmarsson, Torfi Geir
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Wu, Pianpian
    Bishop, Kevin
    Levanoni, Oded
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    High methylmercury formation in ponds fueled by fresh humic and algal derived organic matter2018In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 63, no S1, p. S44-S53Article in journal (Refereed)
    Abstract [en]

    Neurotoxic methylmercury causes adverse effects to ecosystem viability and human health. Previous studies have revealed that ponding alters natural organic matter (NOM) composition and increase methylmercury concentrations in rivers, especially in the first years after flooding. Here, we investigate the influence of NOM composition (i.e., sources and degradation status) on mercury methylation rate constants in nine boreal beaver ponds of different ages across Sweden.We show that increased methylmercury concentrations in surface waters is a consequence of enhanced mercury methylation in the pond sediments. Moreover, our results reveal that during the first years after the initial flooding, mercury methylation rates are fueled by the amount of fresh humic substances released from the flooded soils and by an increased production of algal-derived NOM triggered by enhanced nutrient availability. Our findings indicate that impoundment-induced changes in NOM composition control mercury methylation processes, causing the raise in MeHg levels in ponds.

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  • 16.
    Isidorova, Anastasija
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bravo, Andrea G.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Riise, Gunnhild
    Norwegian Univ Life Sci, Dept Environm Sci, Akershus, Norway..
    Bouchet, Sylvain
    Umea Univ, Dept Chem, Umea, Sweden..
    Björn, Erik
    Umea Univ, Dept Chem, Umea, Sweden..
    Sobek, Sebastian
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    The effect of lake browning and respiration mode on the burial and fate of carbon and mercury in the sediment of two boreal lakes2016In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 121, no 1, p. 233-245Article in journal (Refereed)
    Abstract [en]

    In many northern temperate regions, the water color of lakes has increased over the past decades (lake browning), probably caused by an increased export of dissolved organic matter from soils. We investigated if the increase in water color in two lakes in Norway has resulted in increased burial of organic carbon (OC) and mercury (Hg) in the sediments and if the Hg was prone to methylation. Lake Solbergvann experienced a threefold water color increase, and OC burial increased approximately twofold concomitant to the water color increase. This lake had prolonged periods of anoxic bottom water, and anoxic OC mineralization rates were only about half of the oxic OC mineralization rates (7.7 and 17.5g C m(-2)yr(-1), respectively), contributing to an efficient OC burial. In Lake Elvaga, where water color increase was only approximately twofold and bottom water was oxygenated, no recent increase in OC burial could be observed. Hg burial increased strongly in both lakes (threefold and 1.6-fold in Lake Solbergvann and Lake Elvaga, respectively), again concomitant to the recent water color increase. The proportion of methylated Hg (MeHg) in surficial sediment was 1 order of magnitude higher in Lake Elvaga (up to 6% MeHg) than in Lake Solbergvann (0.2-0.6% MeHg), probably related to the different oxygenation regimes. We conclude that lake browning can result in increased OC and Hg burial in lake sediments, but the extent of browning and the dominating mode of sediment respiration (aerobic or anaerobic) strongly affect burial and fate of OC and Hg in sediments.

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  • 17.
    Jingying, Xu
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Eklöf, Karin
    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, SE-75007, Uppsala, Sweden.
    Ahmed Osman, Omneya
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Schaefer, Jeffra K.
    Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey 08901, USA.
    Bishop, Kevin
    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Skyllberg, Ulf
    Department of Forest Ecology and Management, Swedish University of Agricultural Science, Umeå, Sweden.
    Björn, Erik
    epartment of Forest Ecology and Management, Swedish University of Agricultural Science, Umeå, Sweden.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Department of Marine Biology and Oceanography, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas, Barcelona, Catalunya, Spain.
    Mercury methylating microbial communities of boreal forest soils2019In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, article id 518Article in journal (Refereed)
    Abstract [en]

    The formation of the potent neurotoxic methylmercury (MeHg) is a microbially mediated process that has raised much concern because MeHg poses threats to wildlife and human health. Since boreal forest soils can be a source of MeHg in aquatic networks, it is crucial to understand the biogeochemical processes involved in the formation of this pollutant. High-throughput sequencing of 16S rRNA and the mercury methyltransferase, hgcA, combined with geochemical characterisation of soils, were used to determine the microbial populations contributing to MeHg formation in forest soils across Sweden. The hgcA sequences obtained were distributed among diverse clades, including Proteobacteria, Firmicutes, and Methanomicrobia, with Deltaproteobacteria, particularly Geobacteraceae, dominating the libraries across all soils examined. Our results also suggest that MeHg formation is linked to the composition of also non-mercury methylating bacterial communities, likely providing growth substrate (e.g. acetate) for the hgcA-carrying microorganisms responsible for the actual methylation process. While previous research focused on mercury methylating microbial communities of wetlands, this study provides some first insights into the diversity of mercury methylating microorganisms in boreal forest soils.

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  • 18.
    Jingying, Xu
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Liem-Nguyen, Van
    School of Science and Technology, Örebro University, Örebro, Sweden.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Björn, Erik
    Faculty of Science and Technology, Department of Chemistry, Umeå University, Sweden.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish National Research Council (CSIC), Barcelona, Spain.
    Mercury methylating microbial communities in boreal wetlandsManuscript (preprint) (Other academic)
    Abstract [en]

    Understanding the formation of the potent neurotoxic methylmercury (MeHg) is a major concern due to its threats to wildlife and human health. As boreal wetlands play a crucial role for Hg cycling on a global scale, it is crucial to understand the biogeochemical processes involved in MeHg formation in this landscape. A strategy combining high-throughput hgcA amplicon sequencing with molecular barcoding was used to revealed diverse clades of Hg(II) methylators in a wide range of wetland soils. Our results confirms a predominant role of Deltaproteobacteria, and in particular Geobacteraceae, as important Hg(II) methylators in boreal wetland soils. Firmicutes, and in particular Ruminococcaceae, were also abundant members of the Hg(II) methylating microbial communities. Our survey highlight the importance of nutrient status for the shaping of Hg(II) methylating communities across the four wetlands and reveal that water content and prevailing redox states are key factors determining the local variation in Hg(II) methylating community composition within individual wetlands. Also, our study suggests that high nutrient levels linked to low redox potential seemed to favour Hg(II) methylating methanogens within the Methanoregulaceae. Our findings expand the current knowledge on the Hg(II) methylating microbial community composition in wetland soils and the geochemical factors underpinning spatial heterogeity in such communities.  

  • 19.
    Jingying, Xu
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Liem-Nguyen, Van
    Umeå Univ, Dept Chem, Umeå, Sweden..
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Swedish Univ Agr Sci, Uppsala, Sweden..
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Swedish Univ Agr Sci, Uppsala, Sweden..
    Björn, Erik
    Umeå Univ, Dept Chem, Umeå, Sweden..
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Spanish Natl Res Council, Inst Marine Sci, Madrid, Spain..
    Mercury Methylating Microbial Community Structure in Boreal Wetlands Explained by Local Physicochemical Conditions2021In: Frontiers in Environmental Science, E-ISSN 2296-665X, Vol. 8, article id 518662Article in journal (Refereed)
    Abstract [en]

    The potent neurotoxin methylmercury (MeHg) is a major concern due to its negative effects on wildlife and human health. Boreal wetlands play a crucial role in Hg cycling on a global scale, and therefore, it is crucial to understand the biogeochemical processes involved in MeHg formation in this landscape element. By combining high-throughput hgcA amplicon sequencing with molecular barcoding, we reveal diverse clades of potential Hg-II methylators in a wide range of wetland soils. Among Bacteria, Desulfuromonadota (14% of total reads), Desulfurobacterota_A, and Desulfurobacterota (up to 6% of total reads), previously classified as Deltaproteobacteria, were important members of the hgcA+ microbial community in the studied wetlands. We also identified Actinobacteriota (9.4% of total reads), Bacteroidota (2% of total reads), and Firmicutes (1.2% of total reads) as members of the hgcA+ microbial community. Within Archaea, Methanosarcinales represented up to 2.5% of the total reads. However, up to half of the hgcA+ community could not be resolved beyond domain Bacteria. Our survey also shows that local physicochemical conditions, such as pH, nutrient concentrations, water content, and prevailing redox states, are important for shaping the hgcA+ microbial community structure across the four studied wetlands. Furthermore, we observed a significant correlation between Hg-II methylation rate constants and the structure of the hgcA+ microbial community. Our findings expand the current knowledge on the hgcA+ microbial community composition in wetlands and the physicochemical factors underpinning spatial heterogeneity in such communities.

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  • 20. Mantzouki, Evanthia
    et al.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Urrutia Cordero, Pablo
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Colom-Montero, William
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Pierson, Don
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    A European Multi Lake Survey dataset of environmental variables , phytoplankton pigments and cyanotoxins2018In: Scientific Data, E-ISSN 2052-4463, Vol. 5, no October, p. 1-13Article in journal (Refereed)
    Abstract [en]

    Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.

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  • 21.
    Mantzouki, Evanthia
    et al.
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, CH-1205 Geneva, Switzerland.
    Lurling, Miquel
    Wageningen Univ & Res, Dept Environm Sci, NL-6700 Wageningen, Netherlands;Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, NL-6700 Wageningen, Netherlands.
    Fastner, Jutta
    German Environm Agcy, Unit Drinking Water Resources & Water Treatment, Correnspl 1, D-14195 Berlin, Germany.
    Domis, Lisette de Senerpont
    Wageningen Univ & Res, Dept Environm Sci, NL-6700 Wageningen, Netherlands;Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, NL-6700 Wageningen, Netherlands.
    Wilk-Wozniak, Elzbieta
    Polish Acad Sci, Inst Nat Conservat, PL-31120 Krakow, Poland.
    Koreiviene, Judita
    Nat Res Ctr, Inst Bot, LT-08412 Vilnius, Lithuania.
    Seelen, Laura
    Wageningen Univ & Res, Dept Environm Sci, NL-6700 Wageningen, Netherlands;Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, NL-6700 Wageningen, Netherlands.
    Teurlincx, Sven
    Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, NL-6700 Wageningen, Netherlands.
    Verstijnen, Yvon
    Wageningen Univ & Res, Dept Environm Sci, NL-6700 Wageningen, Netherlands.
    Krzton, Wojciech
    Polish Acad Sci, Inst Nat Conservat, PL-31120 Krakow, Poland.
    Walusiak, Edward
    Polish Acad Sci, Inst Nat Conservat, PL-31120 Krakow, Poland.
    Karosiene, Jurate
    Nat Res Ctr, Inst Bot, LT-08412 Vilnius, Lithuania.
    Kasperoviciene, Jurate
    Nat Res Ctr, Inst Bot, LT-08412 Vilnius, Lithuania.
    Savadova, Ksenija
    Nat Res Ctr, Inst Bot, LT-08412 Vilnius, Lithuania.
    Vitonyte, Irma
    Nat Res Ctr, Inst Bot, LT-08412 Vilnius, Lithuania.
    Cillero-Castro, Carmen
    3Edata, R&D Dept Environm Engn, Lugo 27004, Spain.
    Budzynska, Agnieszka
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Goldyn, Ryszard
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Kozak, Anna
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Rosinska, Joanna
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Szelag-Wasielewska, Elzbieta
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Domek, Piotr
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Jakubowska-Krepska, Natalia
    Adam Mickiewicz Univ, Dept Water Protect, PL-61614 Poznan, Poland.
    Kwasizur, Kinga
    Adam Mickiewicz Univ, Dept Hydrobiol, PL-61614 Poznan, Poland.
    Messyasz, Beata
    Adam Mickiewicz Univ, Dept Hydrobiol, PL-61614 Poznan, Poland.
    Pelechata, Aleksandra
    Adam Mickiewicz Univ, Dept Hydrobiol, PL-61614 Poznan, Poland.
    Pelechaty, Mariusz
    Adam Mickiewicz Univ, Dept Hydrobiol, PL-61614 Poznan, Poland.
    Kokocinski, Mikolaj
    Adam Mickiewicz Univ, Dept Hydrobiol, PL-61614 Poznan, Poland.
    Garcia-Murcia, Ana
    AECOM URS, Dept Limnol & Water Qual, Barcelona 08036, Spain.
    Real, Monserrat
    AECOM URS, Dept Limnol & Water Qual, Barcelona 08036, Spain.
    Romans, Elvira
    AECOM URS, Dept Limnol & Water Qual, Barcelona 08036, Spain.
    Noguero-Ribes, Jordi
    AECOM URS, Dept Limnol & Water Qual, Barcelona 08036, Spain.
    Parreno Duque, David
    AECOM URS, Dept Limnol & Water Qual, Barcelona 08036, Spain.
    Fernandez-Moran, Elisabeth
    AECOM URS, Dept Limnol & Water Qual, Barcelona 08036, Spain.
    Karakaya, Nusret
    Abant Izzet Baysal Univ, Dept Environm Engn, TR-14280 Bolu, Turkey.
    Haggqvist, Kerstin
    Abo Akad Univ, Dept Sci & Engn, FIN-20520 Turku, Finland.
    Demir, Nilsun
    Ankara Univ, Dept Fisheries & Aquaculture, TR-6100 Ankara, Turkey.
    Beklioglu, Meryem
    Middle East Tech Univ, Dept Biol, TR-6800 Ankara, Turkey.
    Filiz, Nur
    Middle East Tech Univ, Dept Biol, TR-6800 Ankara, Turkey.
    Levi, Eti E.
    Middle East Tech Univ, Dept Biol, TR-6800 Ankara, Turkey.
    Iskin, Ugur
    Middle East Tech Univ, Dept Biol, TR-6800 Ankara, Turkey.
    Bezirci, Gizem
    Middle East Tech Univ, Dept Biol, TR-6800 Ankara, Turkey.
    Tavsanoglu, Ulku Nihan
    Middle East Tech Univ, Dept Biol, TR-6800 Ankara, Turkey.
    Ozhan, Koray
    Middle East Tech Univ, Dept Oceanog, Inst Marine Sci, TR-06800 Ankara, Turkey.
    Gkelis, Spyros
    Aristotle Univ Thessaloniki, Dept Bot, Thessaloniki 54124, Greece.
    Panou, Manthos
    Aristotle Univ Thessaloniki, Dept Bot, Thessaloniki 54124, Greece.
    Fakioglu, Ozden
    Ataturk Univ, Dept Basic Sci, TR-25240 Erzurum, Turkey.
    Avagianos, Christos
    Athens Water Supply & Sewerage Co, Water Qual Dept, Athens 11146, Greece.
    Kaloudis, Triantafyllos
    Athens Water Supply & Sewerage Co, Water Qual Dept, Athens 11146, Greece.
    Celik, Kemal
    Balikesir Univ, Dept Biol, TR-10145 Balikesir, Turkey.
    Yilmaz, Mete
    Bursa Tech Univ, Dept Bioengn, TR-16310 Bursa, Turkey.
    Marce, Rafael
    Catalan Inst Water Res ICRA, Girona 17003, Spain.
    Catalán, Núria
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Catalan Inst Water Res ICRA, Girona 17003, Spain.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Buck, Moritz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Colom-Montero, William
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Mustonen, Kristiina
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Pierson, Don
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Yang, Yang
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Raposeiro, Pedro M.
    Univ Azores, Fac Sci & Technol, InBIO Associated Lab, Res Ctr Biodivers & Genet Resources CIBIO Azores, P-9501801 Ponta Delgada, Portugal.
    Goncalves, Vitor
    Univ Azores, Fac Sci & Technol, InBIO Associated Lab, Res Ctr Biodivers & Genet Resources CIBIO Azores, P-9501801 Ponta Delgada, Portugal.
    Antoniou, Maria G.
    Cyprus Univ Technol, Dept Environm Sci & Technol, CY-3036 Lemesos, Cyprus.
    Tsiarta, Nikoletta
    Cyprus Univ Technol, Dept Environm Sci & Technol, CY-3036 Lemesos, Cyprus.
    McCarthy, Valerie
    Dundalk Inst Technol, Ctr Freshwater & Environm Studies, Dundalk A91 K584, Ireland.
    Perello, Victor C.
    Dundalk Inst Technol, Ctr Freshwater & Environm Studies, Dundalk A91 K584, Ireland.
    Feldmann, Tonu
    Estonian Univ Life Sci, Inst Agr & Environm Sci, EE-51014 Tartu, Estonia.
    Laas, Alo
    Estonian Univ Life Sci, Inst Agr & Environm Sci, EE-51014 Tartu, Estonia.
    Panksep, Kristel
    Estonian Univ Life Sci, Inst Agr & Environm Sci, EE-51014 Tartu, Estonia.
    Tuvikene, Lea
    Estonian Univ Life Sci, Inst Agr & Environm Sci, EE-51014 Tartu, Estonia.
    Gagala, Ilona
    Polish Acad Sci, European Reg Ctr Ecohydrol, PL-90364 Lodz, Poland.
    Mankiewicz-Boczek, Joana
    Polish Acad Sci, European Reg Ctr Ecohydrol, PL-90364 Lodz, Poland.
    Yagci, Meral Apaydin
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Cinar, Sakir
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Capkin, Kadir
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Yagci, Abdulkadir
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Cesur, Mehmet
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Bilgin, Fuat
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Bulut, Cafer
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Uysal, Rahmi
    Republ Turkey Minist Food Agr, Fisheries Res Inst, TR-32500 Isparta, Turkey.
    Obertegger, Ulrike
    Fdn Edmund Mach, Dept Sustainable Ecosyst & Bioresources, I-38010 San Michele All Adige, Italy.
    Boscaini, Adriano
    Fdn Edmund Mach, Dept Sustainable Ecosyst & Bioresources, I-38010 San Michele All Adige, Italy.
    Flaim, Giovanna
    Fdn Edmund Mach, Dept Sustainable Ecosyst & Bioresources, I-38010 San Michele All Adige, Italy.
    Salmaso, Nico
    Fdn Edmund Mach, Dept Sustainable Ecosyst & Bioresources, I-38010 San Michele All Adige, Italy.
    Cerasino, Leonardo
    Fdn Edmund Mach, Dept Sustainable Ecosyst & Bioresources, I-38010 San Michele All Adige, Italy.
    Richardson, Jessica
    Univ Stirling, Dept Biol & Environm Sci, Stirling FK9 4LA, Scotland.
    Visser, Petra M.
    Univ Amsterdam, Dept Freshwater & Marine Ecol, NL-1090 GE Amsterdam, Netherlands.
    Verspagen, Jolanda M. H.
    Univ Amsterdam, Dept Freshwater & Marine Ecol, NL-1090 GE Amsterdam, Netherlands.
    Karan, Tunay
    Gaziosmanpasa Univ, Dept Mol Biol & Genet, TR-60250 Merkez, Turkey.
    Soylu, Elif Neyran
    Giresun Univ, Dept Biol, TR-28100 Giresun, Turkey.
    Maraslioglu, Faruk
    Hitit Univ, Dept Biol, TR-19040 Corum, Turkey.
    Napiorkowska-Krzebietke, Agnieszka
    Inland Fisheries Inst, Dept Icthyol Hydrobiol & Aquat Ecol, PL-10719 Olsztyn, Poland.
    Ochocka, Agnieszka
    Natl Res Inst, Dept Freshwater Protect, Inst Environm Protect, PL-01692 Warsaw, Poland.
    Pasztaleniec, Agnieszka
    Natl Res Inst, Dept Freshwater Protect, Inst Environm Protect, PL-01692 Warsaw, Poland.
    Antao-Geraldes, Ana M.
    Inst Politecn Braganca, Ctr Invest Montanha, Campus Santa Apolonia, P-5300253 Braganca, Portugal.
    Vasconcelos, Vitor
    Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal;Univ Porto, P-4450208 Matosinhos, Portugal.
    Morais, Joao
    Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal;Univ Porto, P-4450208 Matosinhos, Portugal.
    Vale, Micaela
    Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal;Univ Porto, P-4450208 Matosinhos, Portugal.
    Koker, Latife
    Istanbul Univ, Fac Aquat Sci, Dept Freshwater Resource & Management, TR-34134 Istanbul, Turkey.
    Akcaalan, Reyhan
    Istanbul Univ, Fac Aquat Sci, Dept Freshwater Resource & Management, TR-34134 Istanbul, Turkey.
    Albay, Meric
    Istanbul Univ, Fac Aquat Sci, Dept Freshwater Resource & Management, TR-34134 Istanbul, Turkey.
    Maronic, Dubravka Spoljaric
    Josip Juraj Strossmayer Univ Osijek, Dept Biol, Osijek 31000, Croatia.
    Stevic, Filip
    Josip Juraj Strossmayer Univ Osijek, Dept Biol, Osijek 31000, Croatia.
    Pfeiffer, Tanja Zuna
    Josip Juraj Strossmayer Univ Osijek, Dept Biol, Osijek 31000, Croatia.
    Fonvielle, Jeremy
    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, D-16775 Stechlin, Germany.
    Straile, Dietmar
    Univ Konstanz, Limnol Inst, Dept Biol, D-78464 Constance, Germany.
    Rothhaupt, Karl-Otto
    Univ Konstanz, Limnol Inst, Dept Biol, D-78464 Constance, Germany.
    Hansson, Lars-Anders
    Lund Univ, Dept Biol, S-22362 Lund, Sweden.
    Urrutia Cordero, Pablo
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Lund Univ, Dept Biol, S-22362 Lund, Sweden.
    Blaha, Ludek
    Masaryk Univ, RECETOX, Fac Sci, Brno 62500, Czech Republic.
    Geris, Rodan
    Morava Board Author, Dept Hydrobiol, Brno 60200, Czech Republic.
    Frankova, Marketa
    Czech Acad Sci, Inst Bot, Lab Paleoecol, Brno 60200, Czech Republic.
    Kocer, Mehmet Ali Turan
    Mediterranean Fisheries Res Prod & Training Inst, Dept Environm & Resource Management, TR-7090 Antalya, Turkey.
    Alp, Mehmet Tahir
    Mersin Univ, Fac Aquaculture, TR-33160 Mersin, Turkey.
    Remec-Rekar, Spela
    Slovenian Environm Agcy, Water Qual Dept, Ljubljana 1000, Slovenia.
    Elersek, Tina
    Natl Inst Biol, Dept Genet Toxicol & Canc Biol, Ljubljana 1000, Slovenia.
    Triantis, Theodoros
    Natl Ctr Sci Res Demokritos, Inst Nanosci & Nanotechnol, Attiki 15341, Greece.
    Zervou, Sevasti-Kiriaki
    Natl Ctr Sci Res Demokritos, Inst Nanosci & Nanotechnol, Attiki 15341, Greece.
    Hiskia, Anastasia
    Natl Ctr Sci Res Demokritos, Inst Nanosci & Nanotechnol, Attiki 15341, Greece.
    Haande, Sigrid
    Norwegian Inst Water Res, Dept Freshwater Ecol, N-0349 Oslo, Norway.
    Skjelbred, Birger
    Norwegian Inst Water Res, Dept Freshwater Ecol, N-0349 Oslo, Norway.
    Madrecka, Beata
    Poznan Univ Tech, Inst Environm Engn, PL-60965 Poznan, Poland.
    Nemova, Hana
    Publ Hlth Author Slovak Republ, Natl Reference Ctr Hydrobiol, Bratislava 82645, Slovakia.
    Drastichova, Iveta
    Publ Hlth Author Slovak Republ, Natl Reference Ctr Hydrobiol, Bratislava 82645, Slovakia.
    Chomova, Lucia
    Publ Hlth Author Slovak Republ, Natl Reference Ctr Hydrobiol, Bratislava 82645, Slovakia.
    Edwards, Christine
    Robert Gordon Univ, Sch Pharm & Life Sci, Aberdeen AB10 7GJ, Scotland.
    Sevindik, Tugba Ongun
    Sakarya Univ, Dept Biol, TR-54187 Sakarya, Turkey.
    Tunca, Hatice
    Sakarya Univ, Dept Biol, TR-54187 Sakarya, Turkey.
    OEnem, Burcin
    Sakarya Univ, Dept Biol, TR-54187 Sakarya, Turkey.
    Aleksovski, Boris
    SS Cyril & Methodius Univ, Fac Nat Sci & Math, Skopje 1000, Macedonia.
    Krstic, Svetislav
    SS Cyril & Methodius Univ, Fac Nat Sci & Math, Skopje 1000, Macedonia.
    Vucelic, Itana Bokan
    Teaching Inst Publ Hlth Primorje Gorski Kotar Cty, Dept Ecotoxicol, Rijeka 51000, Croatia.
    Nawrocka, Lidia
    State Univ Appl Sci, Inst Technol, PL-82300 Elblag, Poland.
    Salmi, Pauliina
    Univ Jyvaskyla, Dept Biol & Environm Sci, Jyvaskyla 40014, Finland.
    Machado-Vieira, Danielle
    Univ Fed Paraiba, Dept Sistemat & Ecol, BR-58059970 Joao Pessoa, Paraiba, Brazil.
    de Oliveira, Alinne Gurjao
    Univ Fed Paraiba, Dept Sistemat & Ecol, BR-58059970 Joao Pessoa, Paraiba, Brazil.
    Delgado-Martin, Jordi
    Univ A Coruna, Dept Civil Engn, La Coruna 15192, Spain.
    Garcia, David
    Univ A Coruna, Dept Civil Engn, La Coruna 15192, Spain.
    Cereijo, Jose Luis
    Univ A Coruna, Dept Civil Engn, La Coruna 15192, Spain.
    Goma, Joan
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, E-08028 Barcelona, Spain.
    Trapote, Mari Carmen
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, E-08028 Barcelona, Spain.
    Vegas-Vilarrubia, Teresa
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, E-08028 Barcelona, Spain.
    Obrador, Biel
    Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, E-08028 Barcelona, Spain.
    Grabowska, Magdalena
    Univ Bialystok, Dept Hydrobiol, PL-15245 Bialystok, Poland.
    Karpowicz, Maciej
    Univ Bialystok, Dept Hydrobiol, PL-15245 Bialystok, Poland.
    Chmura, Damian
    Univ Bielsko Biala, Inst Environm Protect & Engn, PL-43309 Bielsko Biala, Poland.
    Ubeda, Barbara
    Univ Cadiz, Dept Biol, Puerto Real 11510, Spain.
    Angel Galvez, Jose
    Univ Cadiz, Dept Biol, Puerto Real 11510, Spain.
    Ozen, Arda
    Univ Cankiri Karatekin, Dept Forest Engn, TR-18200 Cankiri, Turkey.
    Christoffersen, Kirsten Seestern
    Univ Copenhagen, Dept Biol, Freshwater Biol Lab, DK-2100 Copenhagen, Denmark.
    Warming, Trine Perlt
    Univ Copenhagen, Dept Biol, Freshwater Biol Lab, DK-2100 Copenhagen, Denmark.
    Kobos, Justyna
    Univ Gdansk, Dept Marine Biotechnol, PL-81378 Gdynia, Poland.
    Mazur-Marzec, Hanna
    Univ Gdansk, Dept Marine Biotechnol, PL-81378 Gdynia, Poland.
    Perez-Martinez, Carmen
    Univ Granada, Dept Ecol, E-18071 Granada, Spain.
    Ramos-Rodriguez, Eloisa
    Univ Granada, Dept Ecol, E-18071 Granada, Spain.
    Arvola, Lauri
    Univ Helsinki, Lammi Biol Stn, Lammi 16900, Finland.
    Alcaraz-Parraga, Pablo
    Univ Jaen, Dept Anim Biol Plant Biol & Ecol, Jaen 23701, Spain.
    Toporowska, Magdalena
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, PL-20262 Lublin, Poland.
    Pawlik-Skowronska, Barbara
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, PL-20262 Lublin, Poland.
    Niedzwiecki, Michal
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, PL-20262 Lublin, Poland.
    Peczula, Wojciech
    Univ Life Sci Lublin, Dept Hydrobiol & Protect Ecosyst, PL-20262 Lublin, Poland.
    Leira, Manel
    Univ Lisbon, Inst Dom Luiz, P-1749016 Lisbon, Portugal.
    Hernandez, Armand
    CSIC, ICTJA, Inst Earth Sci Jaume Almera, Barcelona 08028, Spain.
    Moreno-Ostos, Enrique
    Univ Malaga, Dept Ecol, E-29071 Malaga, Spain.
    Maria Blanco, Jose
    Univ Malaga, Dept Ecol, E-29071 Malaga, Spain.
    Rodriguez, Valeriano
    Univ Malaga, Dept Ecol, E-29071 Malaga, Spain.
    Juan Montes-Perez, Jorge
    Univ Malaga, Dept Ecol, E-29071 Malaga, Spain.
    Palomino, Roberto L.
    Univ Malaga, Dept Ecol, E-29071 Malaga, Spain.
    Rodriguez-Perez, Estela
    Univ Malaga, Dept Ecol, E-29071 Malaga, Spain.
    Carballeira, Rafael
    Univ A Coruna, Fac Ciencias, CICA, La Coruna 15071, Spain.
    Camacho, Antonio
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Paterna Valencia 46980, Spain.
    Picazo, Antonio
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Paterna Valencia 46980, Spain.
    Rochera, Carlos
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Paterna Valencia 46980, Spain.
    Santamans, Anna C.
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Paterna Valencia 46980, Spain.
    Ferriol, Carmen
    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol, Paterna Valencia 46980, Spain.
    Romo, Susana
    Univ Valencia, Dept Microbiol & Ecol, E-46100 Burjassot, Spain.
    Miguel Soria, Juan
    Univ Valencia, Dept Microbiol & Ecol, E-46100 Burjassot, Spain.
    Dunalska, Julita
    Univ Warmia & Mazury, Dept Water Protect Engn, PL-10720 Olsztyn, Poland.
    Sienska, Justyna
    Univ Warmia & Mazury, Dept Water Protect Engn, PL-10720 Olsztyn, Poland.
    Szymanski, Daniel
    Univ Warmia & Mazury, Dept Water Protect Engn, PL-10720 Olsztyn, Poland.
    Kruk, Marek
    Univ Warmia & Mazury, Dept Tourism Recreat & Ecol, PL-10720 Olsztyn, Poland.
    Kostrzewska-Szlakowska, Iwona
    Univ Warsaw, Fac Biol, PL-02096 Warsaw, Poland.
    Jasser, Iwona
    Univ Warsaw, Dept Plant Ecol & Environm Conservat, Fac Biol, PL-02089 Warsaw, Poland.
    Zutinic, Petar
    Univ Zagreb, Dept Biol, Fac Sci, Zagreb 10000, Croatia.
    Udovic, Marija Gligora
    Univ Zagreb, Dept Biol, Fac Sci, Zagreb 10000, Croatia.
    Plenkovic-Moraj, Andelka
    Univ Zagreb, Dept Biol, Fac Sci, Zagreb 10000, Croatia.
    Frak, Magdalena
    Warsaw Univ Life Sci SGGW, Fac Civil & Environm Engn, Dept Environm Improvement, PL-02787 Warsaw, Poland.
    Bankowska-Sobczak, Agnieszka
    Warsaw Univ Life Sci SGGW, Fac Civil & Environm Engn, Dept Hydraul Engn, PL-02787 Warsaw, Poland.
    Wasilewicz, Michal
    Warsaw Univ Life Sci SGGW, Fac Civil & Environm Engn, Dept Hydraul Engn, PL-02787 Warsaw, Poland.
    Ozkan, Korhan
    Middle East Tech Univ, Inst Marine Sci Marine Biol & Fisheries, TR-06800 Ankara, Turkey.
    Maliaka, Valentini
    Wageningen Univ & Res, Dept Environm Sci, NL-6700 Wageningen, Netherlands;Soc Protect Prespa, Agios Germanos 53077, Greece;Radboud Univ Nijmegen, Dept Aquat Ecol & Environm Biol, Inst Water & Wetland Res, NL-6525 AJ Nijmegen, Netherlands.
    Kangro, Kersti
    Estonian Univ Life Sci, Inst Agr & Environm Sci, EE-51014 Tartu, Estonia;Univ Tartu, Fac Sci & Technol, Tartu Observ, EE-61602 Tartu, Estonia.
    Grossart, Hans-Peter
    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, D-16775 Stechlin, Germany;Univ Potsdam, Inst Biochem & Biol, D-14469 Potsdam, Germany.
    Paerl, Hans W.
    Univ N Carolina, Inst Marine Sci, Chapel Hill, NC 28557 USA.
    Carey, Cayelan C.
    Virginia Tech, Dept Biol Sci, Blacksburg, VA 24061 USA.
    Ibelings, Bas W.
    Univ Geneva, Dept FA Forel Environm & Aquat Sci, CH-1205 Geneva, Switzerland.
    Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins2018In: Toxins, ISSN 2072-6651, E-ISSN 2072-6651, Vol. 10, no 4, article id 156Article in journal (Refereed)
    Abstract [en]

    Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.

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  • 22.
    Pastor, Ada
    et al.
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain.;Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain..
    Lupon, Anna
    Swedish Univ Agr Sci SLU, Dept Forest Ecol & Management, S-90183 Umea, Sweden..
    Gomez-Gener, Lluis
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain..
    Rodriguez-Castillo, Tamara
    Univ Cantabria Avda, Environm Hydraul Inst, Isabel Torres 15,Parque Cientif Tecnol Cantabria, Santander 39011, Spain..
    Abril, Meritxell
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain..
    Arce, Maria Isabel
    Leibniz Inst Freshwater Ecol & Inland Fisheries I, Muggelseedamm 310, D-12587 Berlin, Germany..
    Aristi, Ibon
    Univ Basque Country, Dept Plant Biol & Ecol, Lab Stream Ecol, POB 644, Bilbao 48080, Spain..
    Arroita, Maite
    Univ Basque Country, Dept Plant Biol & Ecol, Lab Stream Ecol, POB 644, Bilbao 48080, Spain..
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    de Castro-Catala, Nuria
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain..
    del Campo, Ruben
    Univ Murcia, Fac Biol, Dept Ecol & Hydrol, Reg Campus Int Excellence Campus Mare Nostrum, E-30100 Murcia, Spain..
    Pere Casas-Ruiz, Joan
    Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain..
    Estevez, Edurne
    Univ Cantabria Avda, Environm Hydraul Inst, Isabel Torres 15,Parque Cientif Tecnol Cantabria, Santander 39011, Spain..
    Fernandez, Diego
    Univ Koblenz Landau, Inst Environm Sci, Fortstr, D-776829 Landau, Germany..
    Fillol, Mireia
    Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain..
    Flores, Lorea
    INRA, UMR 1224, Ecol Comportementale & Biol Populat Poissons, Aquapole, F-64310 St Pee Sur Nivelle, France..
    Freixa, Anna
    Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain.;Univ Girona, Fac Ciencies, Inst Aquat Ecol, Campus Montilivi S-N, Girona 17071, Spain..
    Gimenez-Grau, Pau
    Ctr Ecol Res & Forestry Applicat CREAF, Cerdanyola Del Valles 08193, Spain..
    Maria Gonzalez-Ferreras, Alexia
    Univ Cantabria Avda, Environm Hydraul Inst, Isabel Torres 15,Parque Cientif Tecnol Cantabria, Santander 39011, Spain..
    Hernandez-del Amo, Elena
    Univ Girona, Fac Ciencies, Inst Aquat Ecol, Campus Montilivi S-N, Girona 17071, Spain..
    Martin, Eduardo J.
    Swiss Fed Inst Aquat Sci & Technol EAWAG, CH-8600 Dubendorf, Switzerland..
    Martinez, Aingeru
    Univ Basque Country, Dept Plant Biol & Ecol, Lab Stream Ecol, POB 644, Bilbao 48080, Spain..
    Monroy, Silvia
    Univ Basque Country, Dept Plant Biol & Ecol, Lab Stream Ecol, POB 644, Bilbao 48080, Spain..
    Mora-Gomez, Juanita
    Univ Girona, Fac Ciencies, Inst Aquat Ecol, Campus Montilivi S-N, Girona 17071, Spain..
    Palacin-Lizarbe, Carlos
    Ctr Ecol Res & Forestry Applicat CREAF, Cerdanyola Del Valles 08193, Spain..
    Pereda, Olatz
    Univ Basque Country, Dept Plant Biol & Ecol, Lab Stream Ecol, POB 644, Bilbao 48080, Spain..
    Poblador, Silvia
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain..
    Rasines-Ladero, Ruben
    Univ Alcala De Henares, IMDEA Water Inst, Av Punto Com 2,Sci Technol Pk, Alcala De Henares 28805, Spain..
    Reyes, Marta
    Swiss Fed Inst Aquat Sci & Technol EAWAG, CH-8600 Dubendorf, Switzerland..
    Rodriguez-Lozano, Pablo
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain.;Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA..
    Ruiz, Celia
    IMDEA Natl Museum Nat Sci MNCN CSIC, Jose Gutierrez Abascal 2, Madrid 28006, Spain..
    Sanpera-Calbet, Isis
    Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain..
    Solagaistua, Libe
    Univ Basque Country, Dept Plant Biol & Ecol, Lab Stream Ecol, POB 644, Bilbao 48080, Spain..
    Tornero, Irene
    Univ Girona, Fac Ciencies, Inst Aquat Ecol, Campus Montilivi S-N, Girona 17071, Spain..
    Catalán, Núria
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain..
    Local and regional drivers of headwater streams metabolism: insights from the first AIL collaborative project2017In: LIMNETICA, ISSN 0213-8409, Vol. 36, no 1, p. 67-85Article in journal (Refereed)
    Abstract [en]

    Streams play a key role in the global biogeochemical cycles, processing material from adjacent terrestrial systems and transporting it downstream. However, the drivers of stream metabolism, especially those acting at broad spatial scales, are still not well understood. Moreover, stream metabolism can be affected by hydrological changes associated with seasonality, and thus, assessing the temporality of metabolic rates is a key question to understand stream function. This study aims to analyse the geographical and temporal patterns in stream metabolism and to identify the main drivers regulating the whole ecosystem metabolic rates at local and regional scales. Using a coordinated distributed experiment, we studied ten headwaters streams located across five European ecoregions during summer and fall 2014. We characterized the magnitude and variability of gross primary production (GPP) and ecosystem respiration (ER) with the open-channel method. Moreover, we examined several climatic, geographical, hydrological, morphological, and physicochemical variables that can potentially control stream metabolic rates. Daily rates of stream metabolism varied considerately across streams, with GPP and ER ranging from 0.06 to 4.33 g O-2 m(-2) d(-1) and from 0.72 to 14.20 g O-2 m(-2) d(-1), respectively. All streams were highly heterotrophic (P/R < 1), except the southernmost one. We found that the drier climates tended to have the highest GPP, while humid regions presented the highest ER. Between the sampling periods no statistical differences were found. Partial-least squares models (PLS) explained similar to 80% of the variance in GPP and ER rates across headwater streams and included both local and regional variables. Rates of GPP varied primarily in response to the local variables, such as streambed substrate and stream water temperature. In contrast, regional variables, such as the mean annual temperature or the land use of the catchment, had more relevance to explain ER. Overall, our results highlight that stream metabolism depends on both local and regional drivers and show the positive experience of a young network of researchers to assess scientific challenges across large-scale geographic areas.

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  • 23. Regier, N.
    et al.
    Larras, F.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Ungureanu, V. -G
    Amouroux, D.
    Cosio, C.
    Mercury bioaccumulation in the aquatic plant Elodea nuttallii in the field and in microcosm: Accumulation in shoots from the water might involve copper transporters2013In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 90, no 2, p. 595-602Article in journal (Refereed)
    Abstract [en]

    Previous studies suggest that macrophytes might participate in bioaccumulation and biomagnification of toxic mercury (Hg) in aquatic environment. Hg bioaccumulation and uptake mechanisms in macrophytes need therefore to be studied. Amongst several macrophytes collected in an Hg contaminated reservoir in Romania, Elodea nuttallii showed a high organic and inorganic Hg accumulation and was then further studied in the laboratory.Tolerance and accumulation of Hg of this plant was also high in the microcosm. Basipetal transport of inorganic Hg was predominant, whereas acropetal transport of methyl-Hg was observed with apparently negligible methylation or demethylation in planta. Hg concentrations were higher in roots&gt;leaves&gt;stems and in top&gt;middle&gt;bottom of shoots. In shoots, more than 60% Hg was found intracellularly where it is believed to be highly available to predators. Accumulation in shoots was highly reduced by cold, death and by competition with Cu+.Hg in E. nuttallii shoots seems to mainly originate from the water column, but methyl-Hg could also be remobilized from the sediments and might drive in part its entry in the food web. At the cellular level, uptake of Hg into the cell sap of shoots seems linked to the metabolism and to copper transporters. The present work highlights an important breakthrough in our understanding of Hg accumulation and biomagnifications: the remobilization of methyl-Hg from sediments to aquatic plants and differences in uptake mechanisms of inorganic and methyl-Hg in a macrophyte.

  • 24.
    Wu, Pianpian
    et al.
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Kainz, Martin J.
    Interuniv Ctr Aquat Ecosyst Res, WasserCluster Biol Stn Lunz, Lunz, Austria.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Åkerblom, Staffan
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Sonesten, Lars
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Bishop, Kevin
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    The importance of bioconcentration into the pelagic food web base for methylmercury biomagnification: A meta-analysis2019In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 646, p. 357-367Article, review/survey (Refereed)
    Abstract [en]

    Methylmercury (MeHg) transfer from water into the base of the food web (bioconcentration) and subsequent biomagnification in the aquatic food web leads to most of the MeHg in fish. But how important is bioconcentration compared to biomagnification in predicting MeHg in fish? To answer this question we reviewed articles in which MeHg concentrations in water, plankton (seston and/or zooplankton), as well as fish (planktivorous and small omnivorous fish) were reported. This yielded 32 journal articles with data from 59 aquatic ecosystems at 22 sites around the world. Although there are many case studies of particular aquatic habitats and specific geographic areas that have examined MeHg bioconcentration and biomagnification, we performed a meta-analysis of such studies. Aqueous MeHg was not a significant predictor of MeHg in fish, but MeHg in seston i.e., the base of the aquatic food web, predicted 63% of the variability in fish MeHg. The MeHg bioconcentration factors (i.e., transfer of MeHg from water to seston; BCFw-s) varied from 3 to 7 orders of magnitude across sites and correlated significantly with MeHg in fish. The MeHg biomagnification factors from zooplankton to fish varied much less (logBMFz-f, 0.75 ± 0.31), and did not significantly correlate with fish MeHg, suggesting that zooplanktivory is not as important as bioconcentration in the biomagnification of fish MeHg across the range of ecosystems represented in our meta-analysis. Partial least square (PLS) and linear regression analyses identified several environmental factors associated with increased BCF, including low dissolved organic carbon, low pH, and oligotrophy. Our study reveals the widespread importance of MeHg bioconcentration into the base of the aquatic food web for MeHg at higher trophic levels in aquatic food webs, as well as the major influences on the variability in this bioconcentration.

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  • 25.
    Wu, Pianpian
    et al.
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Kainz, Martin
    Interuniv Ctr Aquat Ecosyst Res, WasserCluster Biol Stn Lunz, Lunz Am See, Austria.
    Åkerblom, Staffan
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden;Stat Sweden, Stockholm, Sweden.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab. Spanish Natl Res Council, Madrid, Spain.
    Sonesten, Lars
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Branfireun, Brian
    Western Univ, Dept Biol, London, ON, Canada;Western Univ, Ctr Environm & Sustainabil, London, ON, Canada.
    Deininger, Anne
    Univ Agder, Dept Nat Sci, Kristiansand, Norway;Norwegian Inst Water Res NIVA, Grimstad, Norway.
    Bergström, Ann-Kristin
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Bishop, Kevin
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Terrestrial diet influences mercury bioaccumulation in zooplankton and macroinvertebrates in lakes with differing dissolved organic carbon concentrations2019In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 669, p. 821-832Article in journal (Refereed)
    Abstract [en]

    Dietary uptake is a key step in conveying both toxic mercury (Hg; particularly as highly bioavailable methylmercury, MeHg) and essential dietary biochemicals, such as polyunsaturated fatty acids (PUFA), across trophic levels within aquatic food webs. Using stable isotopes and fatty acids we evaluated the role of food sources in size-fractioned plankton and littoral macroinvertebrates for the bioaccumulation of total Hg and MeHg in six oligotrophic and one mesotrophic Swedish lakes with differing concentrations of dissolved organic carbon (DOC). We found that the consumption of both algal and terrestrial diets (assessed by PUFA and long-chain saturated fatty acids, respectively) predicted >66% of the Hg concentration variability in meso- (100-500 mu m) and macrozooplankton (>500 mu m) in oligotrophic lakes. In the mesotrophic lake, total Hg bioaccumulation in higher trophic level biota, carnivorous macroinvertebrates was also significantly related to terrestrial diet sources (R-2 = 0.65, p < 0.01). However, lake pH and DOC correlated to total Hg bioaccumulation and bioconcentration across all lakes, suggesting the consumption of different diet sources is mediated by the influence of lake characteristics. This field study reveals that using dietary biomarkers (stable isotopes and fatty acids) together with the physico-chemical lake parameters pH and nutrients together improve our ability to predict Hg bioaccumulation in aquatic food webs. Fatty acids used as dietary biomarkers provide correlative evidence of specific diet source retention in consumers and their effect on Hg bioaccumulation, while pH and nutrients are the underlying physico-chemical lake parameters controlling differences in Hg bioaccumulation between lakes.

  • 26.
    Xu, Jingying
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Lulea Univ Technol, Dept Civil Environm & Nat gesources Engn, S-97187 Lulea, Sweden.
    Bravo, Andrea Garcia
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Lagerkvist, Anders
    Lulea Univ Technol, Dept Civil Environm & Nat gesources Engn, S-97187 Lulea, Sweden.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Sjöblom, Rolf
    Lulea Univ Technol, Dept Civil Environm & Nat gesources Engn, S-97187 Lulea, Sweden.
    Kumpiene, Jurate
    Lulea Univ Technol, Dept Civil Environm & Nat gesources Engn, S-97187 Lulea, Sweden.
    Sources and remediation techniques for mercury contaminated soil2015In: Environment International, ISSN 0160-4120, E-ISSN 1873-6750, Vol. 74, p. 42-53Article, review/survey (Refereed)
    Abstract [en]

    Mercury (Hg) in soils has increased by a factor of 3 to 10 in recent times mainly due to combustion of fossil fuels combined with long-range atmospheric transport processes. Other sources as chlor-alkali plants, gold mining and cement production can also be significant, at least locally. This paper summarizes the natural and anthropogenic sources that have contributed to the increase of Hg concentration in soil and reviews major remediation techniques and their applications to control soil Hg contamination. The focus is on soil washing, stabilisation/solidification, thermal treatment and biological techniques; but also the factors that influence Hg mobilisation in soil and therefore are crucial for evaluating and optimizing remediation techniques are discussed. Further research on bioremediation is encouraged and future study should focus on the implementation of different remediation techniques under field conditions.

1 - 26 of 26
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