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Title: Warming the phycosphere: Differential effect of temperature on the use of diatom-derived carbon by two copiotrophic bacterial taxa
Authors: Arandia-Gorostidi, Nestor; Alonso-Saez, Laura; Stryhanyuk, Hryhoriy; Richnow, Hans H.; Moran, Xose Anxelu G.; Musat, Niculina
Citation: ENVIRONMENTAL MICROBIOLOGY, 2020, 22, 1381-1396
Abstract: Heterotrophic bacteria associated with microphytoplankton, particularly those colonizing the phycosphere, are major players in the remineralization of algal-derived carbon. Ocean warming might impact dissolved organic carbon (DOC) uptake by microphytoplankton-associated bacteria with unknown biogeochemical implications. Here, by incubating natural seawater samples at three different temperatures, we analysed the effect of experimental warming on the abundance and C and N uptake activity of Rhodobacteraceae and Flavobacteria, two bacterial groups typically associated with microphytoplankton. Using a nano-scale secondary ion mass spectrometry (nanoSIMS) single-cell analysis, we quantified the temperature sensitivity of these two taxonomic groups to the uptake of algal-derived DOC in the microphytoplankton associated fraction with C-13-bicarbonate and N-15-leucine as tracers. We found that cell-specific C-13 uptake was similar for both groups (similar to 0.42 fg C h(-1) mu m(-3)), but Rhodobacteraceae were more active in N-15-leucine uptake. Due to the higher abundance of Flavobacteria associated with microphytoplankton, this group incorporated fourfold more carbon than Rhodobacteraceae. Cell-specific C-13 uptake was influenced by temperature, but no significant differences were found for N-15-leucine uptake. Our results show that the contribution of Flavobacteria and Rhodobacteraceae to C assimilation increased up to sixfold and twofold, respectively, with an increase of 3 degrees C above ambient temperature, suggesting that warming may differently affect the contribution of distinct copiotrophic bacterial taxa to carbon cycling.
Issue Date: 2020
Publisher: WILEY
Type: Article
DOI: 10.1111/1462-2920.14954
ISSN: 1462-2912
E-ISSN: 1462-2920
Funder: Basque GovernmentBasque Government
Spanish Ministry of Economy and Competitiveness (MINECO) [RYC-2012-11404, CTM-2010-15840]
Appears in Publication types:Artículos científicos

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