Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea
The Barents Sea is undergoing rapid ocean warming with less sea ice and increased Atlantic inflow, shifting the pelagic ecosystem towards a more boreal one, a process referred to as Atlantification. While such changes have already been documented in the southern and central Barents Sea, less is know...
Published in: | Progress in Oceanography |
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Online Access: | https://hdl.handle.net/11250/3096843 https://doi.org/10.1016/j.pocean.2023.103133 |
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ftimr:oai:imr.brage.unit.no:11250/3096843 2023-11-12T04:11:33+01:00 Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea Wold, Anette Hop, Haakon Svensen, Camilla Søreide, Janne Assmann, Karen Ormańczyk, M.R. Kwasniewski, S 2023 application/pdf https://hdl.handle.net/11250/3096843 https://doi.org/10.1016/j.pocean.2023.103133 eng eng Norges forskningsråd: 276730 urn:issn:0079-6611 https://hdl.handle.net/11250/3096843 https://doi.org/10.1016/j.pocean.2023.103133 cristin:2185188 Progress in Oceanography Peer reviewed Journal article 2023 ftimr https://doi.org/10.1016/j.pocean.2023.103133 2023-10-18T22:47:26Z The Barents Sea is undergoing rapid ocean warming with less sea ice and increased Atlantic inflow, shifting the pelagic ecosystem towards a more boreal one, a process referred to as Atlantification. While such changes have already been documented in the southern and central Barents Sea, less is known about the degree of Atlantification in the northern Barents Sea and Arctic Ocean. In this seasonal study, we identified the mesozooplankton biodiversity, abundance and biomass in the Northern Barents Sea along a transect with seven stations stretching from the central Barents Sea (76°N) across the shelf break and into the Arctic Ocean (82°N) in August and December 2019, and March, May and July 2021. The broad range of mesozooplankton taxa and sizes were collected by conducting duplicate depth-stratified tows using alternate nets of mesh-sizes 64 µm and 180 µm. The majority of zooplankton taxa were ubiquitous in the study area, but the abundances and life stages varied depending on the season, region and the dominant water mass. We identified three distinct biogeographical regions with different zooplankton diversity and seasonal dynamics; (i) south of the Polar Front, (ii) northern Barents Sea shelf, and (iii) shelf slope and Arctic Ocean. During summer, high abundances of Atlantic/boreal and cosmopolitan zooplankton, mainly Calanus finmarchicus, Metridia longa, Oithona similis and Microsetella norvegica were found just south of the Polar Front in the central Barents Sea. On the shelf, Arctic species, such as Calanus glacialis, Pseudocalanus spp., and Limacina helicina dominated year-round with relatively high and stable biomass. At the northernmost stations, peaks of C. finmarchicus and Oncaeidae (Triconia borealis and Oncaea spp.) occurred in winter, combined with bathypelagic species such as Paraeuchaeta spp., Scaphocalanus brevicornis, Spinocalanus spp., Gaetanus brevispinus and Heterorhabdus norvegicus. Hence, when comparing the mesozooplankton communities at the different locations and seasons, four distinct ... Article in Journal/Newspaper Arctic Arctic Ocean Barents Sea Calanus finmarchicus Calanus glacialis Limacina helicina Mesozooplankton Sea ice Zooplankton Institute for Marine Research: Brage IMR Arctic Arctic Ocean Barents Sea Progress in Oceanography 219 103133 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
The Barents Sea is undergoing rapid ocean warming with less sea ice and increased Atlantic inflow, shifting the pelagic ecosystem towards a more boreal one, a process referred to as Atlantification. While such changes have already been documented in the southern and central Barents Sea, less is known about the degree of Atlantification in the northern Barents Sea and Arctic Ocean. In this seasonal study, we identified the mesozooplankton biodiversity, abundance and biomass in the Northern Barents Sea along a transect with seven stations stretching from the central Barents Sea (76°N) across the shelf break and into the Arctic Ocean (82°N) in August and December 2019, and March, May and July 2021. The broad range of mesozooplankton taxa and sizes were collected by conducting duplicate depth-stratified tows using alternate nets of mesh-sizes 64 µm and 180 µm. The majority of zooplankton taxa were ubiquitous in the study area, but the abundances and life stages varied depending on the season, region and the dominant water mass. We identified three distinct biogeographical regions with different zooplankton diversity and seasonal dynamics; (i) south of the Polar Front, (ii) northern Barents Sea shelf, and (iii) shelf slope and Arctic Ocean. During summer, high abundances of Atlantic/boreal and cosmopolitan zooplankton, mainly Calanus finmarchicus, Metridia longa, Oithona similis and Microsetella norvegica were found just south of the Polar Front in the central Barents Sea. On the shelf, Arctic species, such as Calanus glacialis, Pseudocalanus spp., and Limacina helicina dominated year-round with relatively high and stable biomass. At the northernmost stations, peaks of C. finmarchicus and Oncaeidae (Triconia borealis and Oncaea spp.) occurred in winter, combined with bathypelagic species such as Paraeuchaeta spp., Scaphocalanus brevicornis, Spinocalanus spp., Gaetanus brevispinus and Heterorhabdus norvegicus. Hence, when comparing the mesozooplankton communities at the different locations and seasons, four distinct ... |
format |
Article in Journal/Newspaper |
author |
Wold, Anette Hop, Haakon Svensen, Camilla Søreide, Janne Assmann, Karen Ormańczyk, M.R. Kwasniewski, S |
spellingShingle |
Wold, Anette Hop, Haakon Svensen, Camilla Søreide, Janne Assmann, Karen Ormańczyk, M.R. Kwasniewski, S Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea |
author_facet |
Wold, Anette Hop, Haakon Svensen, Camilla Søreide, Janne Assmann, Karen Ormańczyk, M.R. Kwasniewski, S |
author_sort |
Wold, Anette |
title |
Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea |
title_short |
Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea |
title_full |
Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea |
title_fullStr |
Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea |
title_full_unstemmed |
Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea |
title_sort |
atlantification influences zooplankton communities seasonally in the northern barents sea and arctic ocea |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3096843 https://doi.org/10.1016/j.pocean.2023.103133 |
geographic |
Arctic Arctic Ocean Barents Sea |
geographic_facet |
Arctic Arctic Ocean Barents Sea |
genre |
Arctic Arctic Ocean Barents Sea Calanus finmarchicus Calanus glacialis Limacina helicina Mesozooplankton Sea ice Zooplankton |
genre_facet |
Arctic Arctic Ocean Barents Sea Calanus finmarchicus Calanus glacialis Limacina helicina Mesozooplankton Sea ice Zooplankton |
op_source |
Progress in Oceanography |
op_relation |
Norges forskningsråd: 276730 urn:issn:0079-6611 https://hdl.handle.net/11250/3096843 https://doi.org/10.1016/j.pocean.2023.103133 cristin:2185188 |
op_doi |
https://doi.org/10.1016/j.pocean.2023.103133 |
container_title |
Progress in Oceanography |
container_volume |
219 |
container_start_page |
103133 |
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1782330607228944384 |