Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean
We investigated dinitrogen (N2) fixation activity and diazotroph community composition across the Cape Verde Frontal Zone (CVFZ), from photic epipelagic waters (0-200 m) to aphotic meso- (200–1000 m) and bathypelagic (> 1000 m) waters. The highest N2 fixation rates of 4.1 ± 2.2 nmol N l− 1 day− 1...
Published in: | Biogeochemistry |
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Language: | English |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/activity-and-distribution-of-diazotrophic-communities-across-the-cape-verde-frontal-zone-in-the-northeast-atlantic-ocean(8d94f877-335a-48c9-9d88-904f73d1ab1f).html https://doi.org/10.1007/s10533-022-00940-w https://curis.ku.dk/ws/files/316148186/Hallstrom_et_al_2022.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/8d94f877-335a-48c9-9d88-904f73d1ab1f 2023-05-15T17:41:36+02:00 Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean Hallstrøm, Søren Benavides, Mar Salamon, Ellen R. Arístegui, Javier Riemann, Lasse 2022 application/pdf https://curis.ku.dk/portal/da/publications/activity-and-distribution-of-diazotrophic-communities-across-the-cape-verde-frontal-zone-in-the-northeast-atlantic-ocean(8d94f877-335a-48c9-9d88-904f73d1ab1f).html https://doi.org/10.1007/s10533-022-00940-w https://curis.ku.dk/ws/files/316148186/Hallstrom_et_al_2022.pdf eng eng info:eu-repo/semantics/openAccess Hallstrøm , S , Benavides , M , Salamon , E R , Arístegui , J & Riemann , L 2022 , ' Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean ' , Biogeochemistry , vol. 160 , no. 1 , pp. 49-67 . https://doi.org/10.1007/s10533-022-00940-w article 2022 ftcopenhagenunip https://doi.org/10.1007/s10533-022-00940-w 2022-09-28T22:52:41Z We investigated dinitrogen (N2) fixation activity and diazotroph community composition across the Cape Verde Frontal Zone (CVFZ), from photic epipelagic waters (0-200 m) to aphotic meso- (200–1000 m) and bathypelagic (> 1000 m) waters. The highest N2 fixation rates of 4.1 ± 2.2 nmol N l− 1 day− 1 and 7.8 ± 2.3 nmol N l− 1 day− 1 were in epipelagic waters south of the front. We detected aphotic N2 fixation in 5 out of 32 samples, primarily south of the front, and sporadically down to 3,000 m, with rates ranging from 0.03 ± 0.01 nmol N l− 1 day− 1 to 0.07 ± 0.01 nmol N l− 1 day− 1. Cyanobacteria dominated the diazotroph community and nitrogenase gene (nifH) expression profiles in surface waters and, surprisingly, in aphotic waters. The detection of cyanobacterial nifH genes by DNA sequencing and quantitative PCR in the aphotic zone, together with nifH expression in meso- and bathypelagic waters, indicates a downward flux of metabolically active cyanobacteria, and points to a contribution to the observed aphotic N2 fixation rates. In the photic zone, UCYN-A dominated north of the front, whereas Trichodesmium was mainly found in the southern region. However, our results also show that cross-frontal advection of cyanobacterial diazotrophs can occur via intrusions of surface water. Salinity, temperature, and mixed layer depth were the main determinants of the diazotroph composition and distribution of the key cyanobacteria. Thus, the front appeared to act as a dynamic barrier controlling the distribution of cyanobacterial diazotrophs. Article in Journal/Newspaper Northeast Atlantic University of Copenhagen: Research Biogeochemistry 160 1 49 67 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
We investigated dinitrogen (N2) fixation activity and diazotroph community composition across the Cape Verde Frontal Zone (CVFZ), from photic epipelagic waters (0-200 m) to aphotic meso- (200–1000 m) and bathypelagic (> 1000 m) waters. The highest N2 fixation rates of 4.1 ± 2.2 nmol N l− 1 day− 1 and 7.8 ± 2.3 nmol N l− 1 day− 1 were in epipelagic waters south of the front. We detected aphotic N2 fixation in 5 out of 32 samples, primarily south of the front, and sporadically down to 3,000 m, with rates ranging from 0.03 ± 0.01 nmol N l− 1 day− 1 to 0.07 ± 0.01 nmol N l− 1 day− 1. Cyanobacteria dominated the diazotroph community and nitrogenase gene (nifH) expression profiles in surface waters and, surprisingly, in aphotic waters. The detection of cyanobacterial nifH genes by DNA sequencing and quantitative PCR in the aphotic zone, together with nifH expression in meso- and bathypelagic waters, indicates a downward flux of metabolically active cyanobacteria, and points to a contribution to the observed aphotic N2 fixation rates. In the photic zone, UCYN-A dominated north of the front, whereas Trichodesmium was mainly found in the southern region. However, our results also show that cross-frontal advection of cyanobacterial diazotrophs can occur via intrusions of surface water. Salinity, temperature, and mixed layer depth were the main determinants of the diazotroph composition and distribution of the key cyanobacteria. Thus, the front appeared to act as a dynamic barrier controlling the distribution of cyanobacterial diazotrophs. |
format |
Article in Journal/Newspaper |
author |
Hallstrøm, Søren Benavides, Mar Salamon, Ellen R. Arístegui, Javier Riemann, Lasse |
spellingShingle |
Hallstrøm, Søren Benavides, Mar Salamon, Ellen R. Arístegui, Javier Riemann, Lasse Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean |
author_facet |
Hallstrøm, Søren Benavides, Mar Salamon, Ellen R. Arístegui, Javier Riemann, Lasse |
author_sort |
Hallstrøm, Søren |
title |
Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean |
title_short |
Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean |
title_full |
Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean |
title_fullStr |
Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean |
title_full_unstemmed |
Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean |
title_sort |
activity and distribution of diazotrophic communities across the cape verde frontal zone in the northeast atlantic ocean |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/activity-and-distribution-of-diazotrophic-communities-across-the-cape-verde-frontal-zone-in-the-northeast-atlantic-ocean(8d94f877-335a-48c9-9d88-904f73d1ab1f).html https://doi.org/10.1007/s10533-022-00940-w https://curis.ku.dk/ws/files/316148186/Hallstrom_et_al_2022.pdf |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Hallstrøm , S , Benavides , M , Salamon , E R , Arístegui , J & Riemann , L 2022 , ' Activity and distribution of diazotrophic communities across the Cape Verde Frontal Zone in the Northeast Atlantic Ocean ' , Biogeochemistry , vol. 160 , no. 1 , pp. 49-67 . https://doi.org/10.1007/s10533-022-00940-w |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s10533-022-00940-w |
container_title |
Biogeochemistry |
container_volume |
160 |
container_issue |
1 |
container_start_page |
49 |
op_container_end_page |
67 |
_version_ |
1766143241561833472 |