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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Septentrio Academic Publishing
2000
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ftdoajarticles:oai:doaj.org/article:cfcbc3a46b39456d9721d634151b5cb9 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 Tore Schweder Gro S Hagen Einar Hatlebakk 2000-05-01T00:00:00Z https://doi.org/10.7557/3.2976 https://doaj.org/article/cfcbc3a46b39456d9721d634151b5cb9 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2976 https://doaj.org/article/cfcbc3a46b39456d9721d634151b5cb9 NAMMCO Scientific Publications, Vol 2, Iss 0, Pp 120-132 (2000) minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions Ecology QH540-549.5 article 2000 ftdoajarticles https://doi.org/10.7557/3.2976 2022-12-31T03:36:19Z 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 and herring; 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 Barents Sea 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 whale abundance, 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, with each 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 Directory of Open Access Journals: DOAJ Articles Barents Sea Norwegian Sea NAMMCO Scientific Publications 2 120 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions Ecology QH540-549.5 |
spellingShingle |
minke whales Balaenoptera acutorostrata cod capelin herring modelling interactions Ecology QH540-549.5 Tore Schweder Gro S Hagen Einar Hatlebakk 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 Ecology QH540-549.5 |
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 and herring; 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 Barents Sea 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 whale abundance, 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, with each 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 |
Tore Schweder Gro S Hagen Einar Hatlebakk |
author_facet |
Tore Schweder Gro S Hagen Einar Hatlebakk |
author_sort |
Tore Schweder |
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://doi.org/10.7557/3.2976 https://doaj.org/article/cfcbc3a46b39456d9721d634151b5cb9 |
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, Iss 0, Pp 120-132 (2000) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2976 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2976 https://doaj.org/article/cfcbc3a46b39456d9721d634151b5cb9 |
op_doi |
https://doi.org/10.7557/3.2976 |
container_title |
NAMMCO Scientific Publications |
container_volume |
2 |
container_start_page |
120 |
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1766366443987795968 |