Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea
To study the pattern of interaction between minke whale (Balaenoptera acutorostrata) abundance and the main fisheries in the Greater Barents Sea, a simulation experiment was carried out. The population model involves 4 species interconnected in a food web: cod (Gadus morhua), capelin (Mallotus villo...
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Language: | English |
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Septentrio Academic Publishing
2000
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Online Access: | https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 https://doi.org/10.7557/3.2976 |
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/2976 2023-05-15T15:36:07+02:00 Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea Schweder, Tore Hagen, Gro S Hatlebakk, Einar 2000-05-29 application/pdf https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 https://doi.org/10.7557/3.2976 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976/2849 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 doi:10.7557/3.2976 Copyright (c) 2000 Tore Schweder, Gro S Hagen, Einar Hatlebakk http://creativecommons.org/licenses/by/3.0/ CC-BY NAMMCO Scientific Publications; Vol 2: Minke whales, harp and hooded seals: Major predators in the North Atlantic Ecosystem; 120-132 2309-2491 1560-2206 10.7557/3.2 minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2000 ftunitroemsoe https://doi.org/10.7557/3.2976 https://doi.org/10.7557/3.2 2021-08-16T16:41:30Z To study the pattern of interaction between minke whale (Balaenoptera acutorostrata) abundance and the main fisheries in the Greater Barents Sea, a simulation experiment was carried out. The population model involves 4 species interconnected in a food web: cod (Gadus morhua), capelin (Mallotus villosus), herring (Clupea harengus) and minke whales. Minke whales are preying on cod, capelin andherring; cod are preying on (young) cod, capelin and herring; herring in the Barents Sea are preying on capelin; while capelin is a bottom prey in the model. The consumption function for minke whales is non-linear in available prey abundance, and is estimated from stomach content data and prey abundance data. The model is dynamic, with a time step of one month, and there are two areas: the BarentsSea and the Norwegian Sea. Minke whale abundances are kept on fixed levels, while recruitment in fish is stochastic.Cod and herring fisheries are managed by quotas targeting fixed fishing mortalities, while capelin is managed with a view to allow the cod to have enough food and leaving a sufficient spawning stock of capelin. The model is simulated over a period of 100 years for a number of fixed levels of minke whaleabundance, and simulated catches of cod, herring and capelin are recorded.The experiment showed interactions between whale abundance and fish catches to be mainly linear. For cod catches, both the direct effect of whales consuming cod, and the indirect effect due to whales competing with cod for food and otherwise altering the ecosystem, are linear and of equal importance. The net effect on the herring fishery is of the same magnitude as the net effect on the cod fishery, witheach extra whale reducing the catches of both species by some 5 tonnes. These conclusions are conditional on the model and its parameterisation. Article in Journal/Newspaper Balaenoptera acutorostrata Barents Sea Gadus morhua minke whale Norwegian Sea University of Tromsø: Septentrio Academic Publishing Barents Sea Norwegian Sea NAMMCO Scientific Publications 2 120 |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions |
spellingShingle |
minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions Schweder, Tore Hagen, Gro S Hatlebakk, Einar Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea |
topic_facet |
minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions |
description |
To study the pattern of interaction between minke whale (Balaenoptera acutorostrata) abundance and the main fisheries in the Greater Barents Sea, a simulation experiment was carried out. The population model involves 4 species interconnected in a food web: cod (Gadus morhua), capelin (Mallotus villosus), herring (Clupea harengus) and minke whales. Minke whales are preying on cod, capelin andherring; cod are preying on (young) cod, capelin and herring; herring in the Barents Sea are preying on capelin; while capelin is a bottom prey in the model. The consumption function for minke whales is non-linear in available prey abundance, and is estimated from stomach content data and prey abundance data. The model is dynamic, with a time step of one month, and there are two areas: the BarentsSea and the Norwegian Sea. Minke whale abundances are kept on fixed levels, while recruitment in fish is stochastic.Cod and herring fisheries are managed by quotas targeting fixed fishing mortalities, while capelin is managed with a view to allow the cod to have enough food and leaving a sufficient spawning stock of capelin. The model is simulated over a period of 100 years for a number of fixed levels of minke whaleabundance, and simulated catches of cod, herring and capelin are recorded.The experiment showed interactions between whale abundance and fish catches to be mainly linear. For cod catches, both the direct effect of whales consuming cod, and the indirect effect due to whales competing with cod for food and otherwise altering the ecosystem, are linear and of equal importance. The net effect on the herring fishery is of the same magnitude as the net effect on the cod fishery, witheach extra whale reducing the catches of both species by some 5 tonnes. These conclusions are conditional on the model and its parameterisation. |
format |
Article in Journal/Newspaper |
author |
Schweder, Tore Hagen, Gro S Hatlebakk, Einar |
author_facet |
Schweder, Tore Hagen, Gro S Hatlebakk, Einar |
author_sort |
Schweder, Tore |
title |
Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea |
title_short |
Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea |
title_full |
Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea |
title_fullStr |
Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea |
title_full_unstemmed |
Direct and indirect effects of minke whale abundance on cod and herring fisheries: A scenario experiment for the Greater Barents Sea |
title_sort |
direct and indirect effects of minke whale abundance on cod and herring fisheries: a scenario experiment for the greater barents sea |
publisher |
Septentrio Academic Publishing |
publishDate |
2000 |
url |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 https://doi.org/10.7557/3.2976 |
geographic |
Barents Sea Norwegian Sea |
geographic_facet |
Barents Sea Norwegian Sea |
genre |
Balaenoptera acutorostrata Barents Sea Gadus morhua minke whale Norwegian Sea |
genre_facet |
Balaenoptera acutorostrata Barents Sea Gadus morhua minke whale Norwegian Sea |
op_source |
NAMMCO Scientific Publications; Vol 2: Minke whales, harp and hooded seals: Major predators in the North Atlantic Ecosystem; 120-132 2309-2491 1560-2206 10.7557/3.2 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976/2849 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 doi:10.7557/3.2976 |
op_rights |
Copyright (c) 2000 Tore Schweder, Gro S Hagen, Einar Hatlebakk http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7557/3.2976 https://doi.org/10.7557/3.2 |
container_title |
NAMMCO Scientific Publications |
container_volume |
2 |
container_start_page |
120 |
_version_ |
1766366443179343872 |