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...
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ftdoajarticles:oai:doaj.org/article:bbbbb0fd9fda444cbd36e151a7df3938 2023-05-15T17:31:31+02:00 Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic Q. Devresse K. W. Becker A. Bendinger J. Hahn A. Engel 2022-11-01T00:00:00Z https://doi.org/10.5194/bg-19-5199-2022 https://doaj.org/article/bbbbb0fd9fda444cbd36e151a7df3938 EN eng Copernicus Publications https://bg.copernicus.org/articles/19/5199/2022/bg-19-5199-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-5199-2022 1726-4170 1726-4189 https://doaj.org/article/bbbbb0fd9fda444cbd36e151a7df3938 Biogeosciences, Vol 19, Pp 5199-5219 (2022) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/bg-19-5199-2022 2022-12-30T21:20:31Z 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 Directory of Open Access Journals: DOAJ Articles Biogeosciences 19 22 5199 5219 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 Q. Devresse K. W. Becker A. Bendinger J. Hahn A. Engel Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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 |
Q. Devresse K. W. Becker A. Bendinger J. Hahn A. Engel |
author_facet |
Q. Devresse K. W. Becker A. Bendinger J. Hahn A. Engel |
author_sort |
Q. Devresse |
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 |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-5199-2022 https://doaj.org/article/bbbbb0fd9fda444cbd36e151a7df3938 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 19, Pp 5199-5219 (2022) |
op_relation |
https://bg.copernicus.org/articles/19/5199/2022/bg-19-5199-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-5199-2022 1726-4170 1726-4189 https://doaj.org/article/bbbbb0fd9fda444cbd36e151a7df3938 |
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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1766129147866775552 |