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  • 1. Catalán, N.
    et al.
    Casas-Ruiz, J. P.
    Arce, M. I.
    Abril, M.
    Bravo, A. G.
    del Campo, R.
    Estévez, E.
    Freixa, A.
    Giménez-Grau, P.
    González-Ferreras, A. M.
    Gómez-Gener, Luís
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Lupon, A.
    Martinez, A.
    Palacin-Lizarbe, C.
    Poblador, S.
    Rasines-Ladero, R.
    Reyes, M.
    Rodriguez-Castillo, T.
    Rodriguez-Lozano, P.
    Sanpera-Calbet, I.
    Tornero, I.
    Pastor, A.
    Behind the Scenes: mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams2018In: Global Biogeochemical Cycles, ISSN 0886-6236, E-ISSN 1944-9224, Vol. 32, no 10, p. 1528-1541Article in journal (Refereed)
    Abstract [en]

    Large variability in dissolved organic carbon (DOC) uptake rates has been reported for headwater streams, but the causes of this variability are still not well understood. Here we assessed acetate uptake rates across 11 European streams comprising different ecoregions by using whole-reach pulse acetate additions. We evaluated the main climatic and biogeochemical drivers of acetate uptake during two seasonal periods. Our results show a minor influence of sampling periods but a strong effect of climate and dissolved organic matter (DOM) composition on acetate uptake. In particular, mean annual precipitation explained half of the variability of the acetate uptake velocities (Vf(Acetate)) across streams. Temperate streams presented the lowest Vf(Acetate), together with humic-like DOM and the highest stream respiration rates. In contrast, higher Vf(Acetate) were found in semiarid streams, with protein-like DOM, indicating a dominance of reactive, labile compounds. This, together with lower stream respiration rates and molar ratios of DOC to nitrate, suggests a strong C limitation in semiarid streams, likely due to reduced inputs from the catchment. Overall, this study highlights the interplay of climate and DOM composition and its relevance to understand the biogeochemical mechanisms controlling DOC uptake in streams. Plain Language Summary Headwater streams receive and degrade organic carbon and nutrients from the surrounding catchments. That degradation can be assessed by measuring the uptake of simple compounds of carbon or nitrogen such as acetate or nitrate. Here we determine the variability in acetate and nitrate uptake rates across headwater streams and elucidate the mechanisms behind that variability. The balance between nutrients, the composition of the organic materials present in the streams, and the climatic background is at interplay.

  • 2. Datry, T.
    et al.
    Foulquier, A.
    Corti, R.
    von Schiller, D.
    Tockner, K.
    Mendoza-Lera, C.
    Clement, J. C.
    Gessner, M. O.
    Moleon, M.
    Stubbington, R.
    Gucker, B.
    Albarino, R.
    Allen, D. C.
    Altermatt, F.
    Arce, M. I.
    Arnon, S.
    Banas, D.
    Banegas-Medina, A.
    Beller, E.
    Blanchette, M. L.
    Blanco-Libreros, J. F.
    Blessing, J. J.
    Boechat, I. G.
    Boersma, K. S.
    Bogan, M. T.
    Bonada, N.
    Bond, N. R.
    Brintrup Barria, K. C.
    Bruder, A.
    Burrows, R. M.
    Cancellario, T.
    Canhoto, C.
    Carlson, S. M.
    Cauvy-Fraunie, S.
    Cid, N.
    Danger, M.
    Terra, Bianca de Freitas
    De Girolamo, A. M.
    de La Barra, Evans
    del Campo, R.
    Diaz-Villanueva, V. D.
    Dyer, F.
    Elosegi, A.
    Faye, E.
    Febria, C.
    Four, B.
    Gafny, S.
    Ghate, S. D.
    Gomez, R.
    Gómez-Gener, Lluís
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Graca, M. A. S.
    Guareschi, S.
    Hoppeler, F.
    Hwan, J. L.
    Jones, J. , I
    Kubheka, S.
    Laini, A.
    Langhans, S. D.
    Leigh, C.
    Little, C. J.
    Lorenz, S.
    Marshall, J. C.
    Martin, E.
    McIntosh, A. R.
    Meyer, E. , I
    Milisa, M.
    Mlambo, M. C.
    Morais, M.
    Moya, N.
    Negus, P. M.
    Niyogi, D. K.
    Papatheodoulou, A.
    Pardo, I
    Paril, P.
    Pauls, S. U.
    Pesic, V
    Polasek, M.
    Robinson, C. T.
    Rodriguez-Lozano, P.
    Rolls, R. J.
    Sanchez-Montoya, M. M.
    Savic, A.
    Shumilova, O.
    Sridhar, K. R.
    Steward, A. L.
    Storey, R.
    Taleb, A.
    Uzan, A.
    Vander Vorste, Ross
    Waltham, N. J.
    Woelfle-Erskine, C.
    Zak, D.
    Zarfl, C.
    Zoppini, A.
    A global analysis of terrestrial plant litter dynamics in non-perennial waterways2018In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 11, no 7, p. 497-503Article in journal (Refereed)
    Abstract [en]

    Perennial rivers and streams make a disproportionate contribution to global carbon (C) cycling. However, the contribution of intermittent rivers and ephemeral streams (IRES), which sometimes cease to flow and can dry completely, is largely ignored although they represent over half the global river network. Substantial amounts of terrestrial plant litter (TPL) accumulate in dry riverbeds and, upon rewetting, this material can undergo rapid microbial processing. We present the results of a global research collaboration that collected and analysed TPL from 212 dry riverbeds across major environmental gradients and climate zones. We assessed litter decomposability by quantifying the litter carbon-to-nitrogen ratio and oxygen (O2) consumption in standardized assays and estimated the potential short-term CO2 emissions during rewetting events. Aridity, cover of riparian vegetation, channel width and dry-phase duration explained most variability in the quantity and decomposability of plant litter in IRES. Our estimates indicate that a single pulse of CO2 emission upon litter rewetting contributes up to 10% of the daily CO2 emission from perennial rivers and stream, particularly in temperate climates. This indicates that the contributions of IRES should be included in global C-cycling assessments.

  • 3. Marcé, Rafael
    et al.
    Obrador, Biel
    Gómez-Gener, Lluís
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Catalan, Nuria
    Koschorreck, Matthias
    Arce, María Isabel
    Singer, Gabriel
    von Schiller, Daniel
    Emissions from dry inland waters are a blind spot in the global carbon cycle2019In: Earth-Science Reviews, ISSN 0012-8252, E-ISSN 1872-6828, Vol. 188, p. 240-248Article, review/survey (Refereed)
    Abstract [en]

    A large part of the world's inland waters, including streams, rivers, ponds, lakes and reservoirs is subject to occasional, recurrent or even permanent drying. Moreover, the occurrence and intensity of drying events are increasing in many areas of the world because of climate change, water abstraction, and land use alteration. Yet, information on the gaseous carbon (C) fluxes from dry inland waters is scarce, thus precluding a comprehensive assessment of C emissions including all, also intermittently dry, inland waters. Here, we review current knowledge on gaseous C fluxes from lotic (streams and rivers) and lentic (ponds, lakes, and reservoirs) inland waters during dry phases and the response to rewetting, considering controls and sources as well as implications of including 'dry' fluxes for local and global scale estimates. Moreover, knowledge gaps and research needs are discussed. Our conservative estimates indicate that adding emissions from dry inland waters to current global estimates of CO2 emissions from inland waters could result in an increase of 0.22 Pg C year(-1), or similar to 10% of total fluxes. We outline the necessary conceptual understanding to successfully include dry phases in a more complete picture of inland water C emissions and identify potential implications for global C cycle feedbacks.

  • 4. Obrador, Biel
    et al.
    von Schiller, Daniel
    Marcé, Rafael
    Gómez-Gener, Lluís
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain.
    Koschorreck, Matthias
    Borrego, Carles
    Catalán, Núria
    Dry habitats sustain high CO2 emissions from temporary ponds across seasons2018In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 3015Article in journal (Refereed)
    Abstract [en]

    Despite the increasing understanding of the magnitude and drivers of carbon gas emissions from inland waters, the relevance of water fluctuation and associated drying on their dynamics is rarely addressed. Here, we quantified CO2 and CH4 fluxes from a set of temporary ponds across seasons. The ponds were in all occasion net CO2 emitters irrespective of the presence or absence of water. While the CO2 fluxes were in the upper range of emissions for freshwater lentic systems, CH4 fluxes were mostly undetectable. Dry habitats substantially contributed to these emissions and were always a source of CO2, whereas inundated habitats acted either as a source or a sink of atmospheric CO2 along the year. Higher concentrations of coloured and humic organic matter in water and sediment were linked to higher CO2 emissions. Composition of the sediment microbial community was related both to dissolved organic matter concentration and composition, but we did not find a direct link with CO2 fluxes. The presence of methanogenic archaea in most ponds suggested the potential for episodic CH4 production and emission. Our results highlight the need for spatially and temporally inclusive approaches that consider the dry phases and habitats to characterize carbon cycling in temporary systems.

  • 5. Shumilova, Oleksandra
    et al.
    Zak, Dominik
    Datry, Thibault
    von Schiller, Daniel
    Corti, Roland
    Foulquier, Arnaud
    Obrador, Biel
    Tockner, Klement
    Allan, Daniel C.
    Altermatt, Florian
    Isabel Arce, Maria
    Arnon, Shai
    Banas, Damien
    Banegas-Medina, Andy
    Beller, Erin
    Blanchette, Melanie L.
    Blanco-Libreros, Juan F.
    Blessing, Joanna
    Boechat, Iola Goncalves
    Boersma, Kate
    Bogan, Michael T.
    Bonada, Nuria
    Bond, Nick R.
    Brintrup, Kate
    Bruder, Andreas
    Burrows, Ryan
    Cancellario, Tommaso
    Carlson, Stephanie M.
    Cauvy-Fraunie, Sophie
    Cid, Nuria
    Danger, Michael
    de Freitas Terra, Bianca
    De Girolamo, Anna Maria
    del Campo, Ruben
    Dyer, Fiona
    Elosegi, Arturo
    Faye, Emile
    Febria, Catherine
    Figueroa, Ricardo
    Four, Brian
    Gessner, Mark O.
    Gnohossou, Pierre
    Cerezo, Rosa Gomez
    Gómez-Gener, Lluís
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Graca, Manuel A. S.
    Guareschi, Simone
    Guecker, Bjoern
    Hwan, Jason L.
    Kubheka, Skhumbuzo
    Langhans, Simone Daniela
    Leigh, Catherine
    Little, Chelsea J.
    Lorenz, Stefan
    Marshall, Jonathan
    McIntosh, Angus
    Mendoza-Lera, Clara
    Meyer, Elisabeth Irmgard
    Milisa, Marko
    Mlambo, Musa C.
    Moleon, Marcos
    Negus, Peter
    Niyogi, Dev
    Papatheodoulou, Athina
    Pardo, Isabel
    Paril, Petr
    Pesic, Vladimir
    Rodriguez-Lozano, Pablo
    Rolls, Robert J.
    Sanchez-Montoya, Maria Mar
    Savic, Ana
    Steward, Alisha
    Stubbington, Rachel
    Taleb, Amina
    Vander Vorste, Ross
    Waltham, Nathan
    Zoppini, Annamaria
    Zarfl, Christiane
    Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter2019In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 25, no 5, p. 1591-1611Article in journal (Refereed)
    Abstract [en]

    Climate change and human pressures are changing the global distribution and the extent of intermittent rivers and ephemeral streams (IRES), which comprise half of the global river network area. IRES are characterized by periods of flow cessation, during which channel substrates accumulate and undergo physico-chemical changes (preconditioning), and periods of flow resumption, when these substrates are rewetted and release pulses of dissolved nutrients and organic matter (OM). However, there are no estimates of the amounts and quality of leached substances, nor is there information on the underlying environmental constraints operating at the global scale. We experimentally simulated, under standard laboratory conditions, rewetting of leaves, riverbed sediments, and epilithic biofilms collected during the dry phase across 205 IRES from five major climate zones. We determined the amounts and qualitative characteristics of the leached nutrients and OM, and estimated their areal fluxes from riverbeds. In addition, we evaluated the variance in leachate characteristics in relation to selected environmental variables and substrate characteristics. We found that sediments, due to their large quantities within riverbeds, contribute most to the overall flux of dissolved substances during rewetting events (56%-98%), and that flux rates distinctly differ among climate zones. Dissolved organic carbon, phenolics, and nitrate contributed most to the areal fluxes. The largest amounts of leached substances were found in the continental climate zone, coinciding with the lowest potential bioavailability of the leached OM. The opposite pattern was found in the arid zone. Environmental variables expected to be modified under climate change (i.e. potential evapotranspiration, aridity, dry period duration, land use) were correlated with the amount of leached substances, with the strongest relationship found for sediments. These results show that the role of IRES should be accounted for in global biogeochemical cycles, especially because prevalence of IRES will increase due to increasing severity of drying events.

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