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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ftdoajarticles:oai:doaj.org/article:54ae72ab72d54f9e9b602cad47ee9d40 2023-05-15T17:31:06+02:00 The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic Nicholas Baetge Michael J. Behrenfeld James Fox Kimberly H. Halsey Kristina D. A. Mojica Anai Novoa Brandon M. Stephens Craig A. Carlson 2021-06-01T00:00:00Z https://doi.org/10.3389/fmicb.2021.669883 https://doaj.org/article/54ae72ab72d54f9e9b602cad47ee9d40 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmicb.2021.669883/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2021.669883 https://doaj.org/article/54ae72ab72d54f9e9b602cad47ee9d40 Frontiers in Microbiology, Vol 12 (2021) bioavailability bacterioplankton carbon demand dissolved organic carbon NAAMES biological carbon pump Microbiology QR1-502 article 2021 ftdoajarticles https://doi.org/10.3389/fmicb.2021.669883 2022-12-31T06:53:07Z 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. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Frontiers in Microbiology 12 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
bioavailability bacterioplankton carbon demand dissolved organic carbon NAAMES biological carbon pump Microbiology QR1-502 |
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bioavailability bacterioplankton carbon demand dissolved organic carbon NAAMES biological carbon pump Microbiology QR1-502 Nicholas Baetge Michael J. Behrenfeld James Fox Kimberly H. Halsey Kristina D. A. Mojica Anai Novoa Brandon M. Stephens Craig A. Carlson The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic |
topic_facet |
bioavailability bacterioplankton carbon demand dissolved organic carbon NAAMES biological carbon pump Microbiology QR1-502 |
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. |
format |
Article in Journal/Newspaper |
author |
Nicholas Baetge Michael J. Behrenfeld James Fox Kimberly H. Halsey Kristina D. A. Mojica Anai Novoa Brandon M. Stephens Craig A. Carlson |
author_facet |
Nicholas Baetge Michael J. Behrenfeld James Fox Kimberly H. Halsey Kristina D. A. Mojica Anai Novoa Brandon M. Stephens Craig A. Carlson |
author_sort |
Nicholas Baetge |
title |
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_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_sort |
seasonal flux and fate of dissolved organic carbon through bacterioplankton in the western north atlantic |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmicb.2021.669883 https://doaj.org/article/54ae72ab72d54f9e9b602cad47ee9d40 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Frontiers in Microbiology, Vol 12 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmicb.2021.669883/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2021.669883 https://doaj.org/article/54ae72ab72d54f9e9b602cad47ee9d40 |
op_doi |
https://doi.org/10.3389/fmicb.2021.669883 |
container_title |
Frontiers in Microbiology |
container_volume |
12 |
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1766128430749843456 |