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Distinct Coastal Microbiome Populations Associated With Autochthonous- and Allochthonous-Like Dissolved Organic Matter
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Linnaeus University, Sweden.ORCID iD: 0000-0001-9005-5168
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2019 (English)In: Frontiers in Microbiology, ISSN 1664-302X, E-ISSN 1664-302X, Vol. 10, article id 2579Article in journal (Refereed) Published
Abstract [en]

Coastal zones are important transitional areas between the land and sea, where both terrestrial and phytoplankton supplied dissolved organic matter (DOM) are respired or transformed. As climate change is expected to increase river discharge and water temperatures, DOM from both allochthonous and autochthonous sources is projected to increase. As these transformations are largely regulated by bacteria, we analyzed microbial community structure data in relation to a 6-month long time-series dataset of DOM characteristics from Roskilde Fjord and adjacent streams, Denmark. The results showed that the microbial community composition in the outer estuary (closer to the sea) was largely associated with salinity and nutrients, while the inner estuary formed two clusters linked to either nutrients plus allochthonous DOM or autochthonous DOM characteristics. In contrast, the microbial community composition in the streams was found to be mainly associated with allochthonous DOM characteristics. A general pattern across the land-to-sea interface was that Betaproteobacteria were strongly associated with humic-like DOM [operational taxonomic units (OTUs) belonging to family Comamonadaceae], while distinct populations were instead associated with nutrients or abiotic variables such as temperature (Cyanobacteria genusĀ Synechococcus) and salinity (Actinobacteria family Microbacteriaceae). Furthermore, there was a stark shift in the relative abundance of OTUs between stream and marine stations. This indicates that as DOM travels through the land-to-sea interface, different bacterial guilds continuously degrade it.

Place, publisher, year, edition, pages
2019. Vol. 10, article id 2579
Keywords [en]
16S rRNA gene, DOM, estuarial and coastal areas, DNA, water
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-175633DOI: 10.3389/fmicb.2019.02579ISI: 000498524600001OAI: oai:DiVA.org:su-175633DiVA, id: diva2:1368409
Available from: 2019-11-07 Created: 2019-11-07 Last updated: 2019-12-09Bibliographically approved

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Broman, EliasAsmala, EeroCarstensen, JacobPinhassi, JaroneDopson, Mark
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