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The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic

The oceans teem with heterotrophic bacterioplankton that play an appreciable role in the uptake of dissolved organic carbon (DOC) derived from phytoplankton net primary production (NPP). As such, bacterioplankton carbon demand (BCD), or gross heterotrophic production, represents a major carbon pathw...

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Autores principales: Baetge, Nicholas, Behrenfeld, Michael J., Fox, James, Halsey, Kimberly H., Mojica, Kristina D. A., Novoa, Anai, Stephens, Brandon M., Carlson, Craig A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8249739/
https://www.ncbi.nlm.nih.gov/pubmed/34220753
http://dx.doi.org/10.3389/fmicb.2021.669883
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author Baetge, Nicholas
Behrenfeld, Michael J.
Fox, James
Halsey, Kimberly H.
Mojica, Kristina D. A.
Novoa, Anai
Stephens, Brandon M.
Carlson, Craig A.
author_facet Baetge, Nicholas
Behrenfeld, Michael J.
Fox, James
Halsey, Kimberly H.
Mojica, Kristina D. A.
Novoa, Anai
Stephens, Brandon M.
Carlson, Craig A.
author_sort Baetge, Nicholas
collection PubMed
description The oceans teem with heterotrophic bacterioplankton that play an appreciable role in the uptake of dissolved organic carbon (DOC) derived from phytoplankton net primary production (NPP). As such, bacterioplankton carbon demand (BCD), or gross heterotrophic production, represents a major carbon pathway that influences the seasonal accumulation of DOC in the surface ocean and, subsequently, the potential vertical or horizontal export of seasonally accumulated DOC. Here, we examine the contributions of bacterioplankton and DOM to ecological and biogeochemical carbon flow pathways, including those of the microbial loop and the biological carbon pump, in the Western North Atlantic Ocean (∼39–54°N along ∼40°W) over a composite annual phytoplankton bloom cycle. Combining field observations with data collected from corresponding DOC remineralization experiments, we estimate the efficiency at which bacterioplankton utilize DOC, demonstrate seasonality in the fraction of NPP that supports BCD, and provide evidence for shifts in the bioavailability and persistence of the seasonally accumulated DOC. Our results indicate that while the portion of DOC flux through bacterioplankton relative to NPP increased as seasons transitioned from high to low productivity, there was a fraction of the DOM production that accumulated and persisted. This persistent DOM is potentially an important pool of organic carbon available for export to the deep ocean via convective mixing, thus representing an important export term of the biological carbon pump.
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spelling pubmed-82497392021-07-03 The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic Baetge, Nicholas Behrenfeld, Michael J. Fox, James Halsey, Kimberly H. Mojica, Kristina D. A. Novoa, Anai Stephens, Brandon M. Carlson, Craig A. Front Microbiol Microbiology The oceans teem with heterotrophic bacterioplankton that play an appreciable role in the uptake of dissolved organic carbon (DOC) derived from phytoplankton net primary production (NPP). As such, bacterioplankton carbon demand (BCD), or gross heterotrophic production, represents a major carbon pathway that influences the seasonal accumulation of DOC in the surface ocean and, subsequently, the potential vertical or horizontal export of seasonally accumulated DOC. Here, we examine the contributions of bacterioplankton and DOM to ecological and biogeochemical carbon flow pathways, including those of the microbial loop and the biological carbon pump, in the Western North Atlantic Ocean (∼39–54°N along ∼40°W) over a composite annual phytoplankton bloom cycle. Combining field observations with data collected from corresponding DOC remineralization experiments, we estimate the efficiency at which bacterioplankton utilize DOC, demonstrate seasonality in the fraction of NPP that supports BCD, and provide evidence for shifts in the bioavailability and persistence of the seasonally accumulated DOC. Our results indicate that while the portion of DOC flux through bacterioplankton relative to NPP increased as seasons transitioned from high to low productivity, there was a fraction of the DOM production that accumulated and persisted. This persistent DOM is potentially an important pool of organic carbon available for export to the deep ocean via convective mixing, thus representing an important export term of the biological carbon pump. Frontiers Media S.A. 2021-06-18 /pmc/articles/PMC8249739/ /pubmed/34220753 http://dx.doi.org/10.3389/fmicb.2021.669883 Text en Copyright © 2021 Baetge, Behrenfeld, Fox, Halsey, Mojica, Novoa, Stephens and Carlson. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Microbiology
Baetge, Nicholas
Behrenfeld, Michael J.
Fox, James
Halsey, Kimberly H.
Mojica, Kristina D. A.
Novoa, Anai
Stephens, Brandon M.
Carlson, Craig A.
The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic
title The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic
title_full The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic
title_fullStr The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic
title_full_unstemmed The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic
title_short The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic
title_sort seasonal flux and fate of dissolved organic carbon through bacterioplankton in the western north atlantic
topic Microbiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8249739/
https://www.ncbi.nlm.nih.gov/pubmed/34220753
http://dx.doi.org/10.3389/fmicb.2021.669883
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