Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth
Arctic Ocean surface sea-ice conditions are linked with the deep sea benthic oxygen fluxes via a cascade of interdependencies across ecosystem components such as primary production, food supply, activity of the benthic community, and their functions. Additionally, each ecosystem component is influen...
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ftpubman:oai:pure.mpg.de:item_3031385 2023-08-20T04:04:14+02:00 Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth Hoffmann, R. Braeckman, U. Hasemann, C. Wenzhöfer, F. 2018 application/pdf http://hdl.handle.net/21.11116/0000-0003-B881-B http://hdl.handle.net/21.11116/0000-0003-B883-9 unknown info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-15-4849-2018 http://hdl.handle.net/21.11116/0000-0003-B881-B http://hdl.handle.net/21.11116/0000-0003-B883-9 info:eu-repo/semantics/openAccess Biogeosciences info:eu-repo/semantics/article 2018 ftpubman https://doi.org/10.5194/bg-15-4849-2018 2023-08-01T23:54:42Z Arctic Ocean surface sea-ice conditions are linked with the deep sea benthic oxygen fluxes via a cascade of interdependencies across ecosystem components such as primary production, food supply, activity of the benthic community, and their functions. Additionally, each ecosystem component is influenced by abiotic factors such as light availability, temperature, water depth, and grain size structure. In this study, we investigated the coupling between surface sea-ice conditions and deep-sea benthic remineralization processes through a cascade of interdependencies in the Fram Strait. We measured sea-ice concentrations, a variety of different sediment characteristics, benthic community parameters, and oxygen fluxes at 12 stations of the LTER HAUSGARTEN observatory, Fram Strait, at water depths of 275-2500 m. Our investigations reveal that the Fram Strait is bisected into two long-lasting and stable regions: (i) a permanently and highly sea-ice-covered area and (ii) a seasonally and low sea-icecovered area. Within the Fram Strait ecosystem, sea-ice concentration and water depth are two independent abiotic factors, controlling the deep-sea benthos. Sea-ice concentration correlated with the available food and water depth with the oxygen flux. In addition, both abiotic factors sea-ice concentration and water depth correlate with the macrofauna biomass. However, at water depths > 1500m the influence of the surface sea-ice cover is minimal with water depth becoming more dominant. Benthic remineralization across the Fram Strait on average is similar to 1 mmol C m(-2)d(-1). Our data indicate that the portion of newly produced carbon that is remineralized by the benthos is 5 % in the seasonally low seaice-covered eastern part of Fram Strait but can be 14 % in the permanently high sea-ice-covered western part of Fram Strait. Here, by comparing a permanently sea-ice-covered area with a seasonally sea-ice-covered area, we discuss a potential scenario for the deep-sea benthic ecosystem in the future Arctic Ocean, in which an ... Article in Journal/Newspaper Arctic Arctic Ocean Fram Strait Sea ice Max Planck Society: MPG.PuRe Arctic Arctic Ocean Biogeosciences 15 16 4849 4869 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
unknown |
description |
Arctic Ocean surface sea-ice conditions are linked with the deep sea benthic oxygen fluxes via a cascade of interdependencies across ecosystem components such as primary production, food supply, activity of the benthic community, and their functions. Additionally, each ecosystem component is influenced by abiotic factors such as light availability, temperature, water depth, and grain size structure. In this study, we investigated the coupling between surface sea-ice conditions and deep-sea benthic remineralization processes through a cascade of interdependencies in the Fram Strait. We measured sea-ice concentrations, a variety of different sediment characteristics, benthic community parameters, and oxygen fluxes at 12 stations of the LTER HAUSGARTEN observatory, Fram Strait, at water depths of 275-2500 m. Our investigations reveal that the Fram Strait is bisected into two long-lasting and stable regions: (i) a permanently and highly sea-ice-covered area and (ii) a seasonally and low sea-icecovered area. Within the Fram Strait ecosystem, sea-ice concentration and water depth are two independent abiotic factors, controlling the deep-sea benthos. Sea-ice concentration correlated with the available food and water depth with the oxygen flux. In addition, both abiotic factors sea-ice concentration and water depth correlate with the macrofauna biomass. However, at water depths > 1500m the influence of the surface sea-ice cover is minimal with water depth becoming more dominant. Benthic remineralization across the Fram Strait on average is similar to 1 mmol C m(-2)d(-1). Our data indicate that the portion of newly produced carbon that is remineralized by the benthos is 5 % in the seasonally low seaice-covered eastern part of Fram Strait but can be 14 % in the permanently high sea-ice-covered western part of Fram Strait. Here, by comparing a permanently sea-ice-covered area with a seasonally sea-ice-covered area, we discuss a potential scenario for the deep-sea benthic ecosystem in the future Arctic Ocean, in which an ... |
format |
Article in Journal/Newspaper |
author |
Hoffmann, R. Braeckman, U. Hasemann, C. Wenzhöfer, F. |
spellingShingle |
Hoffmann, R. Braeckman, U. Hasemann, C. Wenzhöfer, F. Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth |
author_facet |
Hoffmann, R. Braeckman, U. Hasemann, C. Wenzhöfer, F. |
author_sort |
Hoffmann, R. |
title |
Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth |
title_short |
Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth |
title_full |
Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth |
title_fullStr |
Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth |
title_full_unstemmed |
Deep-sea benthic communities and oxygen fluxes in the Arctic Fram Strait controlled by sea-ice cover and water depth |
title_sort |
deep-sea benthic communities and oxygen fluxes in the arctic fram strait controlled by sea-ice cover and water depth |
publishDate |
2018 |
url |
http://hdl.handle.net/21.11116/0000-0003-B881-B http://hdl.handle.net/21.11116/0000-0003-B883-9 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Fram Strait Sea ice |
genre_facet |
Arctic Arctic Ocean Fram Strait Sea ice |
op_source |
Biogeosciences |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-15-4849-2018 http://hdl.handle.net/21.11116/0000-0003-B881-B http://hdl.handle.net/21.11116/0000-0003-B883-9 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-15-4849-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
16 |
container_start_page |
4849 |
op_container_end_page |
4869 |
_version_ |
1774714637417185280 |