Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea
The western Bering Sea is the feeding area for many nekton species with seasonally variable composition. Seasonal changes in abundance, composition and structure of the nekton community in the upper epipelagic layer (0-50 m) of this area are considered on the data collected in trawl surveys conducte...
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2017
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Online Access: | https://doi.org/10.26428/1606-9919-2017-189-3-24 https://doaj.org/article/2384aec6805d4a9d8d8a22ad0cebc42c |
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ftdoajarticles:oai:doaj.org/article:2384aec6805d4a9d8d8a22ad0cebc42c 2023-08-27T04:08:44+02:00 Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea Aleksey A. Somov 2017-06-01T00:00:00Z https://doi.org/10.26428/1606-9919-2017-189-3-24 https://doaj.org/article/2384aec6805d4a9d8d8a22ad0cebc42c RU rus Transactions of the Pacific Research Institute of Fisheries and Oceanography https://izvestiya.tinro-center.ru/jour/article/view/179 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2017-189-3-24 https://doaj.org/article/2384aec6805d4a9d8d8a22ad0cebc42c Известия ТИНРО, Vol 189, Iss 2, Pp 3-24 (2017) западная часть берингова моря верхняя эпипелагиаль нектон видовая структура видовое разнообразие доминирование тихоокеанские лососи кальмары сезонная динамика Aquaculture. Fisheries. Angling SH1-691 article 2017 ftdoajarticles https://doi.org/10.26428/1606-9919-2017-189-3-24 2023-08-06T00:41:16Z The western Bering Sea is the feeding area for many nekton species with seasonally variable composition. Seasonal changes in abundance, composition and structure of the nekton community in the upper epipelagic layer (0-50 m) of this area are considered on the data collected in trawl surveys conducted by Pacific Fish. Res. Center (TINRO) in June-October of the 2003-2015, separately for the deep-water Aleutian and Commander Basins and shelf waters at Cape Navarin. The highest total abundance of nekton was observed in the middle August (2700 kg/km2, on average) and decreased significantly earlier (100 kg/km2 in early June) and later (200 kg/km2 in late October). The dominant species were pacific salmons (Oncorhynchus spp., in particular O. keta ), boreopacific gonate squid ( Boreoteuthis borealis ) and shortarm gonate squid ( Gonatus kamtschaticus ). Besides, walleye pollock ( Theragra chalcogramma ), pacific herring ( Clupea pallasii ) and capelin ( Mallotus villosus ) were abundant in the shelf waters. Three seasons are defined by the species structure: i) early summer from early June to middle July with dominance of pre-anadromous pink salmon O. gorbuscha and chum salmon ( O. keta ) and moderate species diversity (polydominance index 3.5-4.0); ii) summer from late July to middle September with absolute dominance of chum salmon (> 70 % of total nekton abundance) and low species diversity (1.5-2.0); and iii) autumn from late September to the end of October with dominance of chum salmon, sockeye salmon and boreopacific gonate squid in relatively equal proportion, mass appearance of pink salmon juveniles and high species diversity (4.5). Spatial patterns of the nekton distribution change between the seasons, too. They are formed in early summer by mass migrations of many species to the western Bering Sea from the east and south, reflect low intensity of the migrations in summer, and are determined by backward migrations toward the southeastern Commander Basin and further to the central Bering Sea and North ... Article in Journal/Newspaper Bering Sea Pink salmon Theragra chalcogramma Берингов* Directory of Open Access Journals: DOAJ Articles Bering Sea Keta ENVELOPE(-19.455,-19.455,65.656,65.656) Navarin ENVELOPE(-7.211,-7.211,62.303,62.303) Pacific Sockeye ENVELOPE(-130.143,-130.143,54.160,54.160) Izvestiya TINRO 189 2 3 24 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
западная часть берингова моря верхняя эпипелагиаль нектон видовая структура видовое разнообразие доминирование тихоокеанские лососи кальмары сезонная динамика Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
западная часть берингова моря верхняя эпипелагиаль нектон видовая структура видовое разнообразие доминирование тихоокеанские лососи кальмары сезонная динамика Aquaculture. Fisheries. Angling SH1-691 Aleksey A. Somov Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea |
topic_facet |
западная часть берингова моря верхняя эпипелагиаль нектон видовая структура видовое разнообразие доминирование тихоокеанские лососи кальмары сезонная динамика Aquaculture. Fisheries. Angling SH1-691 |
description |
The western Bering Sea is the feeding area for many nekton species with seasonally variable composition. Seasonal changes in abundance, composition and structure of the nekton community in the upper epipelagic layer (0-50 m) of this area are considered on the data collected in trawl surveys conducted by Pacific Fish. Res. Center (TINRO) in June-October of the 2003-2015, separately for the deep-water Aleutian and Commander Basins and shelf waters at Cape Navarin. The highest total abundance of nekton was observed in the middle August (2700 kg/km2, on average) and decreased significantly earlier (100 kg/km2 in early June) and later (200 kg/km2 in late October). The dominant species were pacific salmons (Oncorhynchus spp., in particular O. keta ), boreopacific gonate squid ( Boreoteuthis borealis ) and shortarm gonate squid ( Gonatus kamtschaticus ). Besides, walleye pollock ( Theragra chalcogramma ), pacific herring ( Clupea pallasii ) and capelin ( Mallotus villosus ) were abundant in the shelf waters. Three seasons are defined by the species structure: i) early summer from early June to middle July with dominance of pre-anadromous pink salmon O. gorbuscha and chum salmon ( O. keta ) and moderate species diversity (polydominance index 3.5-4.0); ii) summer from late July to middle September with absolute dominance of chum salmon (> 70 % of total nekton abundance) and low species diversity (1.5-2.0); and iii) autumn from late September to the end of October with dominance of chum salmon, sockeye salmon and boreopacific gonate squid in relatively equal proportion, mass appearance of pink salmon juveniles and high species diversity (4.5). Spatial patterns of the nekton distribution change between the seasons, too. They are formed in early summer by mass migrations of many species to the western Bering Sea from the east and south, reflect low intensity of the migrations in summer, and are determined by backward migrations toward the southeastern Commander Basin and further to the central Bering Sea and North ... |
format |
Article in Journal/Newspaper |
author |
Aleksey A. Somov |
author_facet |
Aleksey A. Somov |
author_sort |
Aleksey A. Somov |
title |
Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea |
title_short |
Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea |
title_full |
Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea |
title_fullStr |
Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea |
title_full_unstemmed |
Seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western Bering Sea |
title_sort |
seasonal dynamics in abundance and species composition of nekton in the upper epipelagic layer of the western bering sea |
publisher |
Transactions of the Pacific Research Institute of Fisheries and Oceanography |
publishDate |
2017 |
url |
https://doi.org/10.26428/1606-9919-2017-189-3-24 https://doaj.org/article/2384aec6805d4a9d8d8a22ad0cebc42c |
long_lat |
ENVELOPE(-19.455,-19.455,65.656,65.656) ENVELOPE(-7.211,-7.211,62.303,62.303) ENVELOPE(-130.143,-130.143,54.160,54.160) |
geographic |
Bering Sea Keta Navarin Pacific Sockeye |
geographic_facet |
Bering Sea Keta Navarin Pacific Sockeye |
genre |
Bering Sea Pink salmon Theragra chalcogramma Берингов* |
genre_facet |
Bering Sea Pink salmon Theragra chalcogramma Берингов* |
op_source |
Известия ТИНРО, Vol 189, Iss 2, Pp 3-24 (2017) |
op_relation |
https://izvestiya.tinro-center.ru/jour/article/view/179 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2017-189-3-24 https://doaj.org/article/2384aec6805d4a9d8d8a22ad0cebc42c |
op_doi |
https://doi.org/10.26428/1606-9919-2017-189-3-24 |
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Izvestiya TINRO |
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189 |
container_issue |
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1775349615750545408 |