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Título : Warming the phycosphere: Differential effect of temperature on the use of diatom-derived carbon by two copiotrophic bacterial taxa
Autor : Arandia-Gorostidi, Nestor; Alonso-Saez, Laura; Stryhanyuk, Hryhoriy; Richnow, Hans H.; Moran, Xose Anxelu G.; Musat, Niculina
Citación : ENVIRONMENTAL MICROBIOLOGY, 2020, 22, 1381-1396
Resumen : 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.
Palabras clave : MAJOR PHYLOGENETIC GROUPS; DISSOLVED ORGANIC-MATTER; HETEROTROPHIC BACTERIA; MARINE BACTERIOPLANKTON; COMMUNITY COMPOSITION; PHYTOPLANKTON BLOOMS; DYNAMICS; GROWTH; ASSIMILATION; ECOLOGY
Fecha de publicación : 2020
Editorial : WILEY
Tipo de documento: Article
Idioma: 
DOI: 10.1111/1462-2920.14954
URI : http://dspace.azti.es/handle/24689/1147
ISSN : 1462-2912
E-ISSN: 1462-2920
Patrocinador: Basque GovernmentBasque Government
Spanish Ministry of Economy and Competitiveness (MINECO) [RYC-2012-11404, CTM-2010-15840]
Aparece en las tipos de publicación: Artículos científicos



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