Bacterioplankton response to physical stratification following deep convection
Dissolved organic carbon (DOC) produced by primary production in the sunlit ocean can be physically transported to the mesopelagic zone. The majority of DOC exported to this zone is remineralized by heterotrophic microbes over a range of timescales. Capturing a deep convective mixing event is rare,...
Published in: | Elementa: Science of the Anthropocene |
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University of California Press
2022
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crunicaliforniap:10.1525/elementa.2021.00078 2023-08-27T04:10:51+02:00 Bacterioplankton response to physical stratification following deep convection Baetge, Nicholas Bolaños, Luis M. Penna, Alice Della Gaube, Peter Liu, Shuting Opalk, Keri Graff, Jason R. Giovannoni, Stephen J. Behrenfeld, Michael J. Carlson, Craig A. 2022 http://dx.doi.org/10.1525/elementa.2021.00078 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00078/737244/elementa.2021.00078.pdf en eng University of California Press http://creativecommons.org/licenses/by/4.0/ Elementa: Science of the Anthropocene volume 10, issue 1 ISSN 2325-1026 Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography journal-article 2022 crunicaliforniap https://doi.org/10.1525/elementa.2021.00078 2023-08-04T13:18:28Z Dissolved organic carbon (DOC) produced by primary production in the sunlit ocean can be physically transported to the mesopelagic zone. The majority of DOC exported to this zone is remineralized by heterotrophic microbes over a range of timescales. Capturing a deep convective mixing event is rare, as is observing how microbes respond in situ to the exported DOC. Here, we report ship and Argo float observations from hydrostation North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) 2 Station 4 (N2S4; 47.46°N, 38.72°W), a retentive anticyclonic eddy in the subtropical region of the western North Atlantic. Changes in biogeochemistry and bacterioplankton responses were tracked as the water column mixed to approximately 230 m and restratified over the subsequent 3 days. Over this period, rapid changes in bacterioplankton production (BP) and cell abundance were observed throughout the water column. BP increased by 91% in the euphotic zone (0–100 m) and 55% in the upper mesopelagic zone (100–200 m), corresponding to 33% and 103% increases in cell abundance, respectively. Within the upper mesopelagic, BP upon the occupation of N2S4 (20 ± 4.7 nmol C L–1 d–1) was significantly greater than the average upper mesopelagic BP rate (2.0 ± 1.6 nmol C L–1 h–1) at other stations that had been stratified for longer periods of time. BP continued to increase to 31 ± 3.0 nmol C L–1 d–1 over the 3-day occupation of N2S4. The rapid changes in BP in the upper mesopelagic did not coincide with rapid changes in community composition, but the taxa that increased in their relative contribution included those typically observed in the epipelagic zone. We interpret the subtle but significant community structure dynamics at N2S4 to reflect how injection of labile organic matter into the upper mesopelagic zone by physical mixing supports continued growth of euphotic zone-associated bacterioplankton lineages on a timescale of days. Article in Journal/Newspaper North Atlantic University of California Press (via Crossref) Elementa: Science of the Anthropocene 10 1 |
institution |
Open Polar |
collection |
University of California Press (via Crossref) |
op_collection_id |
crunicaliforniap |
language |
English |
topic |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
spellingShingle |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Baetge, Nicholas Bolaños, Luis M. Penna, Alice Della Gaube, Peter Liu, Shuting Opalk, Keri Graff, Jason R. Giovannoni, Stephen J. Behrenfeld, Michael J. Carlson, Craig A. Bacterioplankton response to physical stratification following deep convection |
topic_facet |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
description |
Dissolved organic carbon (DOC) produced by primary production in the sunlit ocean can be physically transported to the mesopelagic zone. The majority of DOC exported to this zone is remineralized by heterotrophic microbes over a range of timescales. Capturing a deep convective mixing event is rare, as is observing how microbes respond in situ to the exported DOC. Here, we report ship and Argo float observations from hydrostation North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) 2 Station 4 (N2S4; 47.46°N, 38.72°W), a retentive anticyclonic eddy in the subtropical region of the western North Atlantic. Changes in biogeochemistry and bacterioplankton responses were tracked as the water column mixed to approximately 230 m and restratified over the subsequent 3 days. Over this period, rapid changes in bacterioplankton production (BP) and cell abundance were observed throughout the water column. BP increased by 91% in the euphotic zone (0–100 m) and 55% in the upper mesopelagic zone (100–200 m), corresponding to 33% and 103% increases in cell abundance, respectively. Within the upper mesopelagic, BP upon the occupation of N2S4 (20 ± 4.7 nmol C L–1 d–1) was significantly greater than the average upper mesopelagic BP rate (2.0 ± 1.6 nmol C L–1 h–1) at other stations that had been stratified for longer periods of time. BP continued to increase to 31 ± 3.0 nmol C L–1 d–1 over the 3-day occupation of N2S4. The rapid changes in BP in the upper mesopelagic did not coincide with rapid changes in community composition, but the taxa that increased in their relative contribution included those typically observed in the epipelagic zone. We interpret the subtle but significant community structure dynamics at N2S4 to reflect how injection of labile organic matter into the upper mesopelagic zone by physical mixing supports continued growth of euphotic zone-associated bacterioplankton lineages on a timescale of days. |
format |
Article in Journal/Newspaper |
author |
Baetge, Nicholas Bolaños, Luis M. Penna, Alice Della Gaube, Peter Liu, Shuting Opalk, Keri Graff, Jason R. Giovannoni, Stephen J. Behrenfeld, Michael J. Carlson, Craig A. |
author_facet |
Baetge, Nicholas Bolaños, Luis M. Penna, Alice Della Gaube, Peter Liu, Shuting Opalk, Keri Graff, Jason R. Giovannoni, Stephen J. Behrenfeld, Michael J. Carlson, Craig A. |
author_sort |
Baetge, Nicholas |
title |
Bacterioplankton response to physical stratification following deep convection |
title_short |
Bacterioplankton response to physical stratification following deep convection |
title_full |
Bacterioplankton response to physical stratification following deep convection |
title_fullStr |
Bacterioplankton response to physical stratification following deep convection |
title_full_unstemmed |
Bacterioplankton response to physical stratification following deep convection |
title_sort |
bacterioplankton response to physical stratification following deep convection |
publisher |
University of California Press |
publishDate |
2022 |
url |
http://dx.doi.org/10.1525/elementa.2021.00078 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00078/737244/elementa.2021.00078.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Elementa: Science of the Anthropocene volume 10, issue 1 ISSN 2325-1026 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1525/elementa.2021.00078 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
10 |
container_issue |
1 |
_version_ |
1775353194598105088 |