Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example
There is potential value in exploring multi-stock models to address situations where humpback stocks are mixing. However, sensitivity to theassumptions underlying these models has yet to be fully explored. Using a simple simulation approach, the assumptions of a population model thatallows for mixin...
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ftunivtasecite:oai:ecite.utas.edu.au:75512 2023-05-15T16:36:09+02:00 Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example Leaper, R Peel, S Peel, D Gales, N 2011 application/pdf http://www.iwcoffice.org/JCRM.htm http://ecite.utas.edu.au/75512 en eng International Whaling commission, Cambridge, UK http://ecite.utas.edu.au/75512/1/pp119-128 Leaper et al KF3.pdf Leaper, R and Peel, S and Peel, D and Gales, N, Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example, The Journal of Cetacean Research and Management, 2011, (Special Issue 3) pp. 119-128. ISSN 1561-0713 (2011) [Refereed Article] http://ecite.utas.edu.au/75512 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2011 ftunivtasecite 2019-12-13T21:42:06Z There is potential value in exploring multi-stock models to address situations where humpback stocks are mixing. However, sensitivity to theassumptions underlying these models has yet to be fully explored. Using a simple simulation approach, the assumptions of a population model thatallows for mixing of humpback whale (Megaptera novaeangliae) stocks D and E on feeding areas has been explored by relaxing the assumptionsof the original Johnston and Butterworth model in a number of plausible ways. First the ability of the model to estimate parameters was checkedfor a situation where simulated data are generated from an underlying model of exactly the same form for which the actual values of these parametersare known (Scenario 1). Then the ability of the model to estimate these parameters when alternative forms and assumptions were used for theunderlying model generating the data was investigated. Specifically, stocks were allowed to mix non-uniformly across each feeding area and catchwas non-uniformly distributed across each feeding area (Scenario 2). The consequences of density dependence implemented on feeding rather thanbreeding areas (Scenario 3) were also examined. The original mixing model was robust to alternate mixing and catch allocation scenarios in all butone of the simulations, but when density dependence acted at the level of the feeding rather than the breeding areas, the model produced estimatesthat were quite different from the underlying population. It is recommend that the inclusion of density dependence on feeding areas in models thatallow for mixing of whales on these grounds be investigated further Article in Journal/Newspaper Humpback Whale Megaptera novaeangliae eCite UTAS (University of Tasmania) Butterworth ENVELOPE(66.733,66.733,-70.700,-70.700) |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Leaper, R Peel, S Peel, D Gales, N Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
There is potential value in exploring multi-stock models to address situations where humpback stocks are mixing. However, sensitivity to theassumptions underlying these models has yet to be fully explored. Using a simple simulation approach, the assumptions of a population model thatallows for mixing of humpback whale (Megaptera novaeangliae) stocks D and E on feeding areas has been explored by relaxing the assumptionsof the original Johnston and Butterworth model in a number of plausible ways. First the ability of the model to estimate parameters was checkedfor a situation where simulated data are generated from an underlying model of exactly the same form for which the actual values of these parametersare known (Scenario 1). Then the ability of the model to estimate these parameters when alternative forms and assumptions were used for theunderlying model generating the data was investigated. Specifically, stocks were allowed to mix non-uniformly across each feeding area and catchwas non-uniformly distributed across each feeding area (Scenario 2). The consequences of density dependence implemented on feeding rather thanbreeding areas (Scenario 3) were also examined. The original mixing model was robust to alternate mixing and catch allocation scenarios in all butone of the simulations, but when density dependence acted at the level of the feeding rather than the breeding areas, the model produced estimatesthat were quite different from the underlying population. It is recommend that the inclusion of density dependence on feeding areas in models thatallow for mixing of whales on these grounds be investigated further |
format |
Article in Journal/Newspaper |
author |
Leaper, R Peel, S Peel, D Gales, N |
author_facet |
Leaper, R Peel, S Peel, D Gales, N |
author_sort |
Leaper, R |
title |
Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example |
title_short |
Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example |
title_full |
Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example |
title_fullStr |
Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example |
title_full_unstemmed |
Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example |
title_sort |
exploring the assumptions of multi-stock assessment models for humpback whales ( megaptera novaeangliae ) in the southern hemisphere: using breeding stocks d and e as an example |
publisher |
International Whaling commission, Cambridge, UK |
publishDate |
2011 |
url |
http://www.iwcoffice.org/JCRM.htm http://ecite.utas.edu.au/75512 |
long_lat |
ENVELOPE(66.733,66.733,-70.700,-70.700) |
geographic |
Butterworth |
geographic_facet |
Butterworth |
genre |
Humpback Whale Megaptera novaeangliae |
genre_facet |
Humpback Whale Megaptera novaeangliae |
op_relation |
http://ecite.utas.edu.au/75512/1/pp119-128 Leaper et al KF3.pdf Leaper, R and Peel, S and Peel, D and Gales, N, Exploring the assumptions of multi-stock assessment models for humpback whales ( Megaptera novaeangliae ) in the Southern Hemisphere: using Breeding Stocks D and E as an example, The Journal of Cetacean Research and Management, 2011, (Special Issue 3) pp. 119-128. ISSN 1561-0713 (2011) [Refereed Article] http://ecite.utas.edu.au/75512 |
_version_ |
1766026449941168128 |