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More, smaller bacteria in response to ocean's warming?

Heterotrophic bacteria play a major role in organic matter cycling in the ocean. Although the high abundances and relatively fast growth rates of coastal surface bacterioplankton make them suitable sentinels of global change, past analyses have largely overlooked this functional group. Here, time se...

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Autores principales: Morán, Xosé Anxelu G., Alonso-Sáez, Laura, Nogueira, Enrique, Ducklow, Hugh W., González, Natalia, López-Urrutia, Ángel, Díaz-Pérez, Laura, Calvo-Díaz, Alejandra, Arandia-Gorostidi, Nestor, Huete-Stauffer, Tamara M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4590472/
https://www.ncbi.nlm.nih.gov/pubmed/26063843
http://dx.doi.org/10.1098/rspb.2015.0371
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author Morán, Xosé Anxelu G.
Alonso-Sáez, Laura
Nogueira, Enrique
Ducklow, Hugh W.
González, Natalia
López-Urrutia, Ángel
Díaz-Pérez, Laura
Calvo-Díaz, Alejandra
Arandia-Gorostidi, Nestor
Huete-Stauffer, Tamara M.
author_facet Morán, Xosé Anxelu G.
Alonso-Sáez, Laura
Nogueira, Enrique
Ducklow, Hugh W.
González, Natalia
López-Urrutia, Ángel
Díaz-Pérez, Laura
Calvo-Díaz, Alejandra
Arandia-Gorostidi, Nestor
Huete-Stauffer, Tamara M.
author_sort Morán, Xosé Anxelu G.
collection PubMed
description Heterotrophic bacteria play a major role in organic matter cycling in the ocean. Although the high abundances and relatively fast growth rates of coastal surface bacterioplankton make them suitable sentinels of global change, past analyses have largely overlooked this functional group. Here, time series analysis of a decade of monthly observations in temperate Atlantic coastal waters revealed strong seasonal patterns in the abundance, size and biomass of the ubiquitous flow-cytometric groups of low (LNA) and high nucleic acid (HNA) content bacteria. Over this relatively short period, we also found that bacterioplankton cells were significantly smaller, a trend that is consistent with the hypothesized temperature-driven decrease in body size. Although decadal cell shrinking was observed for both groups, it was only LNA cells that were strongly coherent, with ecological theories linking temperature, abundance and individual size on both the seasonal and interannual scale. We explain this finding because, relative to their HNA counterparts, marine LNA bacteria are less diverse, dominated by members of the SAR11 clade. Temperature manipulation experiments in 2012 confirmed a direct effect of warming on bacterial size. Concurrent with rising temperatures in spring, significant decadal trends of increasing standing stocks (3% per year) accompanied by decreasing mean cell size (−1% per year) suggest a major shift in community structure, with a larger contribution of LNA bacteria to total biomass. The increasing prevalence of these typically oligotrophic taxa may severely impact marine food webs and carbon fluxes by an overall decrease in the efficiency of the biological pump.
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spelling pubmed-45904722015-10-13 More, smaller bacteria in response to ocean's warming? Morán, Xosé Anxelu G. Alonso-Sáez, Laura Nogueira, Enrique Ducklow, Hugh W. González, Natalia López-Urrutia, Ángel Díaz-Pérez, Laura Calvo-Díaz, Alejandra Arandia-Gorostidi, Nestor Huete-Stauffer, Tamara M. Proc Biol Sci Research Articles Heterotrophic bacteria play a major role in organic matter cycling in the ocean. Although the high abundances and relatively fast growth rates of coastal surface bacterioplankton make them suitable sentinels of global change, past analyses have largely overlooked this functional group. Here, time series analysis of a decade of monthly observations in temperate Atlantic coastal waters revealed strong seasonal patterns in the abundance, size and biomass of the ubiquitous flow-cytometric groups of low (LNA) and high nucleic acid (HNA) content bacteria. Over this relatively short period, we also found that bacterioplankton cells were significantly smaller, a trend that is consistent with the hypothesized temperature-driven decrease in body size. Although decadal cell shrinking was observed for both groups, it was only LNA cells that were strongly coherent, with ecological theories linking temperature, abundance and individual size on both the seasonal and interannual scale. We explain this finding because, relative to their HNA counterparts, marine LNA bacteria are less diverse, dominated by members of the SAR11 clade. Temperature manipulation experiments in 2012 confirmed a direct effect of warming on bacterial size. Concurrent with rising temperatures in spring, significant decadal trends of increasing standing stocks (3% per year) accompanied by decreasing mean cell size (−1% per year) suggest a major shift in community structure, with a larger contribution of LNA bacteria to total biomass. The increasing prevalence of these typically oligotrophic taxa may severely impact marine food webs and carbon fluxes by an overall decrease in the efficiency of the biological pump. The Royal Society 2015-07-07 /pmc/articles/PMC4590472/ /pubmed/26063843 http://dx.doi.org/10.1098/rspb.2015.0371 Text en http://creativecommons.org/licenses/by/4.0/ © 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Research Articles
Morán, Xosé Anxelu G.
Alonso-Sáez, Laura
Nogueira, Enrique
Ducklow, Hugh W.
González, Natalia
López-Urrutia, Ángel
Díaz-Pérez, Laura
Calvo-Díaz, Alejandra
Arandia-Gorostidi, Nestor
Huete-Stauffer, Tamara M.
More, smaller bacteria in response to ocean's warming?
title More, smaller bacteria in response to ocean's warming?
title_full More, smaller bacteria in response to ocean's warming?
title_fullStr More, smaller bacteria in response to ocean's warming?
title_full_unstemmed More, smaller bacteria in response to ocean's warming?
title_short More, smaller bacteria in response to ocean's warming?
title_sort more, smaller bacteria in response to ocean's warming?
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4590472/
https://www.ncbi.nlm.nih.gov/pubmed/26063843
http://dx.doi.org/10.1098/rspb.2015.0371
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