Dynamics of trophic structure for the epipelagic community in the western Bering Sea
Changes of quantitative composition and trophic structure of the nekton community in the western Bering Sea are considered for the last decades and role of pacific salmons in dynamics of trophic flows is evaluated in dependence on their abundance using the ecosystem model Ecopath. Two models are dev...
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2014
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Online Access: | https://doi.org/10.26428/1606-9919-2014-179-204-219 https://doaj.org/article/c5ecbc16eaba4b5d90f0c9ce0bc065cd |
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ftdoajarticles:oai:doaj.org/article:c5ecbc16eaba4b5d90f0c9ce0bc065cd 2023-10-09T21:50:19+02:00 Dynamics of trophic structure for the epipelagic community in the western Bering Sea Alexander V. Zavolokin Vladimir I. Radchenko Vladimir V. Kulik 2014-12-01T00:00:00Z https://doi.org/10.26428/1606-9919-2014-179-204-219 https://doaj.org/article/c5ecbc16eaba4b5d90f0c9ce0bc065cd RU rus Transactions of the Pacific Research Institute of Fisheries and Oceanography https://izvestiya.tinro-center.ru/jour/article/view/233 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2014-179-204-219 https://doaj.org/article/c5ecbc16eaba4b5d90f0c9ce0bc065cd Известия ТИНРО, Vol 179, Iss 4, Pp 204-219 (2014) трофическая структура экопас моделирование тихоокеанские лососи берингово море Aquaculture. Fisheries. Angling SH1-691 article 2014 ftdoajarticles https://doi.org/10.26428/1606-9919-2014-179-204-219 2023-09-10T00:41:26Z Changes of quantitative composition and trophic structure of the nekton community in the western Bering Sea are considered for the last decades and role of pacific salmons in dynamics of trophic flows is evaluated in dependence on their abundance using the ecosystem model Ecopath. Two models are developed that describe trophic structure of the community in two cases: 1) low biomass of salmons and high biomass of walleye pollock (in 1980s, the year 1986 is analyzed as an example) and 2) decreased pollock biomass and increasing salmon biomass (in 2000s, the year 2006 as an example). Besides, a hypothetical situation is modeled with the salmon biomass multiplied by 1.5 relative to its level in 2006. Significant decrease of pollock abundance between 1980s and 2000s caused twofold reduction of total food consumption by nekton species; the heightened consumption by salmons and squids in the 2000s compensated only a small part of this reduction. However, the tenfold increase of salmons biomass changed their main diets with lowering of the prey trophic level from amphipods and squids to euphausiids, copepods, and pteropods. Now the salmons are the only numerous predator group of the fourth trophic level in the upper pelagic layer of offshore waters in the western Bering Sea. Due to their high trophic plasticity, they can feed by wide range of prey belonged to 2-3rd trophic levels that supplies them by a large amount of food. Even in the modeled case of increasing of the salmons biomass in 1.5 times relative to the level of 2000s, the current level of forage resources is able to support their populations. There is concluded that carrying capacity of the western Bering Sea is excessively sufficient for pacific salmons in periods of their high abundance. Article in Journal/Newspaper Bering Sea Берингов* Copepods Directory of Open Access Journals: DOAJ Articles Bering Sea Pacific Izvestiya TINRO 179 4 204 219 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
трофическая структура экопас моделирование тихоокеанские лососи берингово море Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
трофическая структура экопас моделирование тихоокеанские лососи берингово море Aquaculture. Fisheries. Angling SH1-691 Alexander V. Zavolokin Vladimir I. Radchenko Vladimir V. Kulik Dynamics of trophic structure for the epipelagic community in the western Bering Sea |
topic_facet |
трофическая структура экопас моделирование тихоокеанские лососи берингово море Aquaculture. Fisheries. Angling SH1-691 |
description |
Changes of quantitative composition and trophic structure of the nekton community in the western Bering Sea are considered for the last decades and role of pacific salmons in dynamics of trophic flows is evaluated in dependence on their abundance using the ecosystem model Ecopath. Two models are developed that describe trophic structure of the community in two cases: 1) low biomass of salmons and high biomass of walleye pollock (in 1980s, the year 1986 is analyzed as an example) and 2) decreased pollock biomass and increasing salmon biomass (in 2000s, the year 2006 as an example). Besides, a hypothetical situation is modeled with the salmon biomass multiplied by 1.5 relative to its level in 2006. Significant decrease of pollock abundance between 1980s and 2000s caused twofold reduction of total food consumption by nekton species; the heightened consumption by salmons and squids in the 2000s compensated only a small part of this reduction. However, the tenfold increase of salmons biomass changed their main diets with lowering of the prey trophic level from amphipods and squids to euphausiids, copepods, and pteropods. Now the salmons are the only numerous predator group of the fourth trophic level in the upper pelagic layer of offshore waters in the western Bering Sea. Due to their high trophic plasticity, they can feed by wide range of prey belonged to 2-3rd trophic levels that supplies them by a large amount of food. Even in the modeled case of increasing of the salmons biomass in 1.5 times relative to the level of 2000s, the current level of forage resources is able to support their populations. There is concluded that carrying capacity of the western Bering Sea is excessively sufficient for pacific salmons in periods of their high abundance. |
format |
Article in Journal/Newspaper |
author |
Alexander V. Zavolokin Vladimir I. Radchenko Vladimir V. Kulik |
author_facet |
Alexander V. Zavolokin Vladimir I. Radchenko Vladimir V. Kulik |
author_sort |
Alexander V. Zavolokin |
title |
Dynamics of trophic structure for the epipelagic community in the western Bering Sea |
title_short |
Dynamics of trophic structure for the epipelagic community in the western Bering Sea |
title_full |
Dynamics of trophic structure for the epipelagic community in the western Bering Sea |
title_fullStr |
Dynamics of trophic structure for the epipelagic community in the western Bering Sea |
title_full_unstemmed |
Dynamics of trophic structure for the epipelagic community in the western Bering Sea |
title_sort |
dynamics of trophic structure for the epipelagic community in the western bering sea |
publisher |
Transactions of the Pacific Research Institute of Fisheries and Oceanography |
publishDate |
2014 |
url |
https://doi.org/10.26428/1606-9919-2014-179-204-219 https://doaj.org/article/c5ecbc16eaba4b5d90f0c9ce0bc065cd |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea Берингов* Copepods |
genre_facet |
Bering Sea Берингов* Copepods |
op_source |
Известия ТИНРО, Vol 179, Iss 4, Pp 204-219 (2014) |
op_relation |
https://izvestiya.tinro-center.ru/jour/article/view/233 https://doaj.org/toc/1606-9919 https://doaj.org/toc/2658-5510 1606-9919 2658-5510 doi:10.26428/1606-9919-2014-179-204-219 https://doaj.org/article/c5ecbc16eaba4b5d90f0c9ce0bc065cd |
op_doi |
https://doi.org/10.26428/1606-9919-2014-179-204-219 |
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Izvestiya TINRO |
container_volume |
179 |
container_issue |
4 |
container_start_page |
204 |
op_container_end_page |
219 |
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1779313371558969344 |