Acoustic scattering layers reveal a faunal connection across the Fram Strait
Acoustic scattering layers (SL) at various depths are common phenomena in most oceans, but the organisms that make up these layers vary and so does their density, and hence the backscattered energy. During two crossings of the deep Fram Strait between the shelves at Svalbard and Northeast Greenland...
Published in: | Progress in Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://research.abo.fi/en/publications/6f05ec04-1a91-4d77-916d-aedabbc5c85d https://doi.org/10.1016/j.pocean.2020.102348 https://research.abo.fi/ws/files/27183403/Gj_s_ter_et_al._2020.pdf http://www.sciencedirect.com/science/article/pii/S0079661120300872 https://urn.fi/URN:NBN:fi-fe202201148144 |
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ftaboakademicris:oai:pure.atira.dk:publications/6f05ec04-1a91-4d77-916d-aedabbc5c85d 2024-05-12T08:00:17+00:00 Acoustic scattering layers reveal a faunal connection across the Fram Strait Gjøsæter, Harald Ingvaldsen, Randi Christiansen, Jørgen S. 2020 application/pdf https://research.abo.fi/en/publications/6f05ec04-1a91-4d77-916d-aedabbc5c85d https://doi.org/10.1016/j.pocean.2020.102348 https://research.abo.fi/ws/files/27183403/Gj_s_ter_et_al._2020.pdf http://www.sciencedirect.com/science/article/pii/S0079661120300872 https://urn.fi/URN:NBN:fi-fe202201148144 eng eng https://research.abo.fi/en/publications/6f05ec04-1a91-4d77-916d-aedabbc5c85d info:eu-repo/semantics/openAccess Gjøsæter , H , Ingvaldsen , R & Christiansen , J S 2020 , ' Acoustic scattering layers reveal a faunal connection across the Fram Strait ' , Progress in Oceanography , vol. 185 . https://doi.org/10.1016/j.pocean.2020.102348 Acoustic scattering layers Young-of-the-year-fishes Advection Arctic Fram Strait article 2020 ftaboakademicris https://doi.org/10.1016/j.pocean.2020.102348 2024-04-16T02:40:34Z Acoustic scattering layers (SL) at various depths are common phenomena in most oceans, but the organisms that make up these layers vary and so does their density, and hence the backscattered energy. During two crossings of the deep Fram Strait between the shelves at Svalbard and Northeast Greenland at latitudes 77°N and 79°N, we registered epipelagic and mesopelagic SL across the entire Fram Strait and quantified their acoustic backscattered energy. In addition, one pelagic trawl haul was made at each crossing together with a CTD cast at the northern crossing. The epipelagic SL was present at 0–200 m depth, whereas the mesopelagic SL was located at 300–500 m depth during day and at shallower depths during night indicating diel vertical migrations. The epipelagic SL consisted of young-of-the-year fishes, mostly redfish Sebastes sp. No trawl hauls were made in the mesopelagic SL, and the identity of organisms is unknown. Few strong echoes from single targets at mesopelagic depths stood out from the rest of the targets and were interpreted as adult Atlantic cod Gadus morhua. This is the first report of scattering layers covering the whole distance of the deep parts of the Fram Strait, and strengthen the assumption about an east–west connection of organisms and young-of-the-year fishes originating from the spawning grounds along the Norwegian coast and the western Barents Sea towards Northeast Greenland. Article in Journal/Newspaper Arctic atlantic cod Barents Sea Fram Strait Gadus morhua Greenland Svalbard Åbo Akademi University Research Portal Arctic Svalbard Barents Sea Greenland Progress in Oceanography 185 102348 |
institution |
Open Polar |
collection |
Åbo Akademi University Research Portal |
op_collection_id |
ftaboakademicris |
language |
English |
topic |
Acoustic scattering layers Young-of-the-year-fishes Advection Arctic Fram Strait |
spellingShingle |
Acoustic scattering layers Young-of-the-year-fishes Advection Arctic Fram Strait Gjøsæter, Harald Ingvaldsen, Randi Christiansen, Jørgen S. Acoustic scattering layers reveal a faunal connection across the Fram Strait |
topic_facet |
Acoustic scattering layers Young-of-the-year-fishes Advection Arctic Fram Strait |
description |
Acoustic scattering layers (SL) at various depths are common phenomena in most oceans, but the organisms that make up these layers vary and so does their density, and hence the backscattered energy. During two crossings of the deep Fram Strait between the shelves at Svalbard and Northeast Greenland at latitudes 77°N and 79°N, we registered epipelagic and mesopelagic SL across the entire Fram Strait and quantified their acoustic backscattered energy. In addition, one pelagic trawl haul was made at each crossing together with a CTD cast at the northern crossing. The epipelagic SL was present at 0–200 m depth, whereas the mesopelagic SL was located at 300–500 m depth during day and at shallower depths during night indicating diel vertical migrations. The epipelagic SL consisted of young-of-the-year fishes, mostly redfish Sebastes sp. No trawl hauls were made in the mesopelagic SL, and the identity of organisms is unknown. Few strong echoes from single targets at mesopelagic depths stood out from the rest of the targets and were interpreted as adult Atlantic cod Gadus morhua. This is the first report of scattering layers covering the whole distance of the deep parts of the Fram Strait, and strengthen the assumption about an east–west connection of organisms and young-of-the-year fishes originating from the spawning grounds along the Norwegian coast and the western Barents Sea towards Northeast Greenland. |
format |
Article in Journal/Newspaper |
author |
Gjøsæter, Harald Ingvaldsen, Randi Christiansen, Jørgen S. |
author_facet |
Gjøsæter, Harald Ingvaldsen, Randi Christiansen, Jørgen S. |
author_sort |
Gjøsæter, Harald |
title |
Acoustic scattering layers reveal a faunal connection across the Fram Strait |
title_short |
Acoustic scattering layers reveal a faunal connection across the Fram Strait |
title_full |
Acoustic scattering layers reveal a faunal connection across the Fram Strait |
title_fullStr |
Acoustic scattering layers reveal a faunal connection across the Fram Strait |
title_full_unstemmed |
Acoustic scattering layers reveal a faunal connection across the Fram Strait |
title_sort |
acoustic scattering layers reveal a faunal connection across the fram strait |
publishDate |
2020 |
url |
https://research.abo.fi/en/publications/6f05ec04-1a91-4d77-916d-aedabbc5c85d https://doi.org/10.1016/j.pocean.2020.102348 https://research.abo.fi/ws/files/27183403/Gj_s_ter_et_al._2020.pdf http://www.sciencedirect.com/science/article/pii/S0079661120300872 https://urn.fi/URN:NBN:fi-fe202201148144 |
geographic |
Arctic Svalbard Barents Sea Greenland |
geographic_facet |
Arctic Svalbard Barents Sea Greenland |
genre |
Arctic atlantic cod Barents Sea Fram Strait Gadus morhua Greenland Svalbard |
genre_facet |
Arctic atlantic cod Barents Sea Fram Strait Gadus morhua Greenland Svalbard |
op_source |
Gjøsæter , H , Ingvaldsen , R & Christiansen , J S 2020 , ' Acoustic scattering layers reveal a faunal connection across the Fram Strait ' , Progress in Oceanography , vol. 185 . https://doi.org/10.1016/j.pocean.2020.102348 |
op_relation |
https://research.abo.fi/en/publications/6f05ec04-1a91-4d77-916d-aedabbc5c85d |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2020.102348 |
container_title |
Progress in Oceanography |
container_volume |
185 |
container_start_page |
102348 |
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1798842113705639936 |