Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic
Mesoscale eddies modulate the ocean's physical, chemical, and biological properties. In cyclonic eddies (CEs), nutrient upwelling can stimulate primary production by phytoplankton. Yet, how this locally enhanced autotrophic production affects heterotrophy and consequently the metabolic balance...
Published in: | Biogeosciences |
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Language: | English |
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Copernicus Publications (EGU)
2022
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Online Access: | https://oceanrep.geomar.de/id/eprint/55319/ https://oceanrep.geomar.de/id/eprint/55319/7/bg-19-5199-2022.pdf https://oceanrep.geomar.de/id/eprint/55319/8/bg-19-5199-2022-supplement.pdf https://bg.copernicus.org/articles/19/5199/2022/ https://doi.org/10.5194/bg-19-5199-2022 |
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ftoceanrep:oai:oceanrep.geomar.de:55319 2024-02-11T10:06:19+01:00 Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic Devresse, Quentin Becker, Kevin W. Bendinger, Arne Hahn, Johannes Engel, Anja 2022-11-17 text https://oceanrep.geomar.de/id/eprint/55319/ https://oceanrep.geomar.de/id/eprint/55319/7/bg-19-5199-2022.pdf https://oceanrep.geomar.de/id/eprint/55319/8/bg-19-5199-2022-supplement.pdf https://bg.copernicus.org/articles/19/5199/2022/ https://doi.org/10.5194/bg-19-5199-2022 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/55319/7/bg-19-5199-2022.pdf https://oceanrep.geomar.de/id/eprint/55319/8/bg-19-5199-2022-supplement.pdf Devresse, Q., Becker, K. W. , Bendinger, A., Hahn, J. and Engel, A. (2022) Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic. Open Access Biogeosciences (BG), 19 . pp. 5199-5219. DOI 10.5194/bg-19-5199-2022 <https://doi.org/10.5194/bg-19-5199-2022>. doi:10.5194/bg-19-5199-2022 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2022 ftoceanrep https://doi.org/10.5194/bg-19-5199-2022 2024-01-15T00:25:07Z Mesoscale eddies modulate the ocean's physical, chemical, and biological properties. In cyclonic eddies (CEs), nutrient upwelling can stimulate primary production by phytoplankton. Yet, how this locally enhanced autotrophic production affects heterotrophy and consequently the metabolic balance between the synthesis and the consumption of dissolved organic matter (DOM) remains largely unknown. To fill this gap, we investigated the horizontal and vertical variability in auto- and heterotrophic microbial activity (biomass production and respiration) within a CE that formed off Mauritania and along the ∼ 900 km zonal corridor between Mauritania and the Cape Verde islands in the Eastern Tropical North Atlantic (ETNA). Our results show how the physical disturbances caused by the CE affected the biomass distribution of phyto- and bacterioplankton and their metabolic activities. The injection of nutrients into the sunlit surface resulted in enhanced autotrophic pico- and nanoplankton abundance and generally increased autotrophic activity as indicated by chlorophyll a (Chl a) concentration, primary production (PP), and extracellular release rates. However, the detailed eddy survey also revealed an uneven distribution of these variables with, for example, the highest Chl a concentrations and PP rates occurring near and just beyond the CE's periphery. The heterotrophic bacterial activity was similarly variable. Optode-based community respiration (CR), bacterial respiration (BR) estimates, and bacterial biomass production (BP) largely followed the trends of PP and Chl a. Thus, a submesoscale spatial mosaic of heterotrophic bacterial abundance and activities occurred within the CE that was closely related to variability in autotrophic production. Consistent with this, we found a significant positive correlation between concentrations of semi-labile dissolved organic carbon (SL-DOC; here the sum of dissolved hydrolysable amino acids and dissolved combined carbohydrates) and BR estimates. Extracellular release of carbon as ... Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Biogeosciences 19 22 5199 5219 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Mesoscale eddies modulate the ocean's physical, chemical, and biological properties. In cyclonic eddies (CEs), nutrient upwelling can stimulate primary production by phytoplankton. Yet, how this locally enhanced autotrophic production affects heterotrophy and consequently the metabolic balance between the synthesis and the consumption of dissolved organic matter (DOM) remains largely unknown. To fill this gap, we investigated the horizontal and vertical variability in auto- and heterotrophic microbial activity (biomass production and respiration) within a CE that formed off Mauritania and along the ∼ 900 km zonal corridor between Mauritania and the Cape Verde islands in the Eastern Tropical North Atlantic (ETNA). Our results show how the physical disturbances caused by the CE affected the biomass distribution of phyto- and bacterioplankton and their metabolic activities. The injection of nutrients into the sunlit surface resulted in enhanced autotrophic pico- and nanoplankton abundance and generally increased autotrophic activity as indicated by chlorophyll a (Chl a) concentration, primary production (PP), and extracellular release rates. However, the detailed eddy survey also revealed an uneven distribution of these variables with, for example, the highest Chl a concentrations and PP rates occurring near and just beyond the CE's periphery. The heterotrophic bacterial activity was similarly variable. Optode-based community respiration (CR), bacterial respiration (BR) estimates, and bacterial biomass production (BP) largely followed the trends of PP and Chl a. Thus, a submesoscale spatial mosaic of heterotrophic bacterial abundance and activities occurred within the CE that was closely related to variability in autotrophic production. Consistent with this, we found a significant positive correlation between concentrations of semi-labile dissolved organic carbon (SL-DOC; here the sum of dissolved hydrolysable amino acids and dissolved combined carbohydrates) and BR estimates. Extracellular release of carbon as ... |
format |
Article in Journal/Newspaper |
author |
Devresse, Quentin Becker, Kevin W. Bendinger, Arne Hahn, Johannes Engel, Anja |
spellingShingle |
Devresse, Quentin Becker, Kevin W. Bendinger, Arne Hahn, Johannes Engel, Anja Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
author_facet |
Devresse, Quentin Becker, Kevin W. Bendinger, Arne Hahn, Johannes Engel, Anja |
author_sort |
Devresse, Quentin |
title |
Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
title_short |
Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
title_full |
Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
title_fullStr |
Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
title_full_unstemmed |
Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
title_sort |
eddy-enhanced primary production sustains heterotrophic microbial activities in the eastern tropical north atlantic |
publisher |
Copernicus Publications (EGU) |
publishDate |
2022 |
url |
https://oceanrep.geomar.de/id/eprint/55319/ https://oceanrep.geomar.de/id/eprint/55319/7/bg-19-5199-2022.pdf https://oceanrep.geomar.de/id/eprint/55319/8/bg-19-5199-2022-supplement.pdf https://bg.copernicus.org/articles/19/5199/2022/ https://doi.org/10.5194/bg-19-5199-2022 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/55319/7/bg-19-5199-2022.pdf https://oceanrep.geomar.de/id/eprint/55319/8/bg-19-5199-2022-supplement.pdf Devresse, Q., Becker, K. W. , Bendinger, A., Hahn, J. and Engel, A. (2022) Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic. Open Access Biogeosciences (BG), 19 . pp. 5199-5219. DOI 10.5194/bg-19-5199-2022 <https://doi.org/10.5194/bg-19-5199-2022>. doi:10.5194/bg-19-5199-2022 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-19-5199-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
22 |
container_start_page |
5199 |
op_container_end_page |
5219 |
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1790603959242588160 |