Linking shifts in bacterial community with changes in dissolved organic matter pool in a tropical lake

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Avila , M P , Brandao , L P M , Brighenti , L S , Tonetta , D , Reis , M P , Staehr , P A , Asmala , E , Amado , A M , Barbosa , F A R , Bezerra-Neto , J F & Nascimento , A M A 2019 , ' Linking shifts in bacterial community with changes in dissolved organic matter pool in a tropical lake ' , The Science of the Total Environment , vol. 672 , pp. 990-1003 .

Title: Linking shifts in bacterial community with changes in dissolved organic matter pool in a tropical lake
Author: Avila, Marcelo P.; Brandao, Luciana P. M.; Brighenti, Ludmila S.; Tonetta, Denise; Reis, Mariana P.; Staehr, Peter A.; Asmala, Eero; Amado, Andre M.; Barbosa, Francisco A. R.; Bezerra-Neto, Jose F.; Nascimento, Andrea M. A.
Contributor organization: Ecosystems and Environment Research Programme
Marine Ecosystems Research Group
Tvärminne Zoological Station
Aquatic Biogeochemistry Research Unit (ABRU)
Date: 2019-07-01
Language: eng
Number of pages: 14
Belongs to series: The Science of the Total Environment
ISSN: 0048-9697
Abstract: Bacterioplankton communities have a pivotal role in the global carbon cycle. Still the interaction between microbial community and dissolved organic matter (DOM) in freshwater ecosystems remains poorly understood. Here, we report results from a 12-day mesocosm study performed in the epilimnion of a tropical lake, in which inorganic nutrients and allochthonous DOM were supplemented under full light and shading. Although the production of autochthonous DOM triggered by nutrient addition was the dominant driver of changes in bacterial community structure, temporal covariations between DOM optical proxies and bacterial community structure revealed a strong influence of community shifts on DOM fate. Community shifts were coupled to a successional stepwise alteration of the DOM pool, with different fractions being selectively consumed by specific taxa Typical freshwater clades as Limnohabitans and Sporichthyaceae were associated with consumption of low molecular weight carbon, whereas Gammaproteobacteria and Flavobacteria utilized higher molecular weight carbon, indicating differences in DOM preference among Glades. Importantly. Verrucomicrobiaceae were important in the turnover of freshly produced autochthonous DOM, ultimately affecting light availability and dissolved organic carbon concentrations. Our findings suggest that taxonomically defined bacterial assemblages play definite roles when influencing DOM fate, either by changing specific fractions of the DOM pool or by regulating light availability and DOC levels. (C) 2019 Elsevier B.V. All rights reserved.
Subject: Community structure
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion

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