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Titel (primär) Warming the phycosphere: Differential effect of temperature on the use of diatom‐derived carbon by two copiotrophic bacterial taxa
Autor Arandia‐Gorostidi, N.; Alonso‐Sáez, L.; Stryhanyuk, H.; Richnow, H.H.; Morán, X.A.G.; Musat, N.;
Journal / Serie Environmental Microbiology
Erscheinungsjahr 2020
Department ISOBIO;
Band/Volume 22
Heft 4
Sprache englisch;
POF III (gesamt) T41;
Supplements https://sfamjournals.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2F1462-2920.14954&file=emi14954-sup-0001-supinfo.docx
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 DOC uptake by microphytoplankton‐associated bacteria with unknown biogeochemical implications. Here, by incubating natural seawater samples at 3 different temperatures we analyzed 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 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 13C‐bicarbonate and 15N‐leucine as tracers. We found that cell‐specific 13C uptake was similar for both groups (~0.42 fg C h−1 μm−3), but Rhodobacteraceae were more active in 15N‐leucine uptake. Due to the higher abundance of Flavobacteria associated with microphytoplankton, this group incorporated 4‐fold more carbon than Rhodobacteraceae. Cell‐specific 13C uptake was influenced by temperature, but no significant differences were found for 15N‐leucine uptake. Our results show that the contribution of Flavobacteria and Rhodobacteraceae to C assimilation increased up to 6‐fold and 2‐fold, respectively, with an increase of 3°C above ambient temperature, suggesting that warming may differently affect the contribution of distinct copiotrophic bacterial taxa to carbon cycling.
ID 22861
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=22861
Arandia‐Gorostidi, N., Alonso‐Sáez, L., Stryhanyuk, H., Richnow, H.H., Morán, X.A.G., Musat, N. (2020):
Warming the phycosphere: Differential effect of temperature on the use of diatom‐derived carbon by two copiotrophic bacterial taxa
Environ. Microbiol. 22 (4), 1381 - 1396