Distinct Coastal Microbiome Populations Associated With Autochthonous- and Allochthonous-Like Dissolved Organic Matter

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http://hdl.handle.net/10138/307006

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Broman , E , Asmala , E , Carstensen , J , Pinhassi , J & Dopson , M 2019 , ' Distinct Coastal Microbiome Populations Associated With Autochthonous- and Allochthonous-Like Dissolved Organic Matter ' , Frontiers in Microbiology , vol. 10 , 2579 . https://doi.org/10.3389/fmicb.2019.02579

Title: Distinct Coastal Microbiome Populations Associated With Autochthonous- and Allochthonous-Like Dissolved Organic Matter
Author: Broman, Elias; Asmala, Eero; Carstensen, Jacob; Pinhassi, Jarone; Dopson, Mark
Contributor: University of Helsinki, Marine Ecosystems Research Group
Date: 2019-11-07
Language: eng
Number of pages: 15
Belongs to series: Frontiers in Microbiology
ISSN: 1664-302X
URI: http://hdl.handle.net/10138/307006
Abstract: 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 genus 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.
Subject: 1181 Ecology, evolutionary biology
1183 Plant biology, microbiology, virology
16S rRNA gene
DOM
estuarial and coastal areas
DNA
water
WATER TEMPERATURE
PELAGIC BACTERIA
MARINE
BACTERIOPLANKTON
PHYTOPLANKTON
ESTUARINE
COMMUNITIES
ENRICHMENT
SOFTWARE
CLIMATE
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