Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks
A surplus production model within a Sampling, Importance Resampling (SIR) Bayesian analysis was used to estimate stock sizes and yields of Baffin Bay belugas. The catch of belugas in West Greenland increased in 1968 and has remained well above sustainable rates. SIR analysis indicated a decline of a...
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Septentrio Academic Publishing
2002
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ftdoajarticles:oai:doaj.org/article:7e8b8b48ccdb4715824c5ce90c171442 2023-05-15T15:34:59+02:00 Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks Stuart Innes Robert EA Stewart 2002-07-01T00:00:00Z https://doi.org/10.7557/3.2846 https://doaj.org/article/7e8b8b48ccdb4715824c5ce90c171442 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2846 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2846 https://doaj.org/article/7e8b8b48ccdb4715824c5ce90c171442 NAMMCO Scientific Publications, Vol 4, Iss 0, Pp 225-238 (2002) belugas Delphinapterus leucas Baffin Bay population size Ecology QH540-549.5 article 2002 ftdoajarticles https://doi.org/10.7557/3.2846 2022-12-31T02:51:24Z A surplus production model within a Sampling, Importance Resampling (SIR) Bayesian analysis was used to estimate stock sizes and yields of Baffin Bay belugas. The catch of belugas in West Greenland increased in 1968 and has remained well above sustainable rates. SIR analysis indicated a decline of about 50% between 1981 and 1994, with a credibility interval that included a previous estimate of 62%. The estimated stock sizes of belugas wintering off West Greenland in 1998 and 1999 were approximately 5,100 and 4,100 respectively and were not significantly different than an estimate based on aerial surveys combined for both years. Projected to 1999 this stock can sustain median landings of 109 whales with a total kill of about 155, based on posterior estimates of struck and lost plus under-reporting. The declining stock size index series did not provide sufficient information to estimate the potential maximum rate of population growth, the number of whales struck and lost, or the shape of the production curve with precision. Estimating these parameters requires an index time series with a marked step change in catch or a series with increasing stock sizes. The stock size estimate for the belugas wintering in the North Water in 1999 was approximately 14,800 but there is no information about the population biology of these whales. The estimated maximum sustainable yield (landed) for the North Water stock was 317 belugas. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Beluga Beluga* Delphinapterus leucas Greenland Directory of Open Access Journals: DOAJ Articles Baffin Bay Greenland NAMMCO Scientific Publications 4 225 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
belugas Delphinapterus leucas Baffin Bay population size Ecology QH540-549.5 |
spellingShingle |
belugas Delphinapterus leucas Baffin Bay population size Ecology QH540-549.5 Stuart Innes Robert EA Stewart Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks |
topic_facet |
belugas Delphinapterus leucas Baffin Bay population size Ecology QH540-549.5 |
description |
A surplus production model within a Sampling, Importance Resampling (SIR) Bayesian analysis was used to estimate stock sizes and yields of Baffin Bay belugas. The catch of belugas in West Greenland increased in 1968 and has remained well above sustainable rates. SIR analysis indicated a decline of about 50% between 1981 and 1994, with a credibility interval that included a previous estimate of 62%. The estimated stock sizes of belugas wintering off West Greenland in 1998 and 1999 were approximately 5,100 and 4,100 respectively and were not significantly different than an estimate based on aerial surveys combined for both years. Projected to 1999 this stock can sustain median landings of 109 whales with a total kill of about 155, based on posterior estimates of struck and lost plus under-reporting. The declining stock size index series did not provide sufficient information to estimate the potential maximum rate of population growth, the number of whales struck and lost, or the shape of the production curve with precision. Estimating these parameters requires an index time series with a marked step change in catch or a series with increasing stock sizes. The stock size estimate for the belugas wintering in the North Water in 1999 was approximately 14,800 but there is no information about the population biology of these whales. The estimated maximum sustainable yield (landed) for the North Water stock was 317 belugas. |
format |
Article in Journal/Newspaper |
author |
Stuart Innes Robert EA Stewart |
author_facet |
Stuart Innes Robert EA Stewart |
author_sort |
Stuart Innes |
title |
Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks |
title_short |
Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks |
title_full |
Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks |
title_fullStr |
Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks |
title_full_unstemmed |
Population size and yield of Baffin Bay beluga ( Delphinapterus leucas ) stocks |
title_sort |
population size and yield of baffin bay beluga ( delphinapterus leucas ) stocks |
publisher |
Septentrio Academic Publishing |
publishDate |
2002 |
url |
https://doi.org/10.7557/3.2846 https://doaj.org/article/7e8b8b48ccdb4715824c5ce90c171442 |
geographic |
Baffin Bay Greenland |
geographic_facet |
Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Beluga Beluga* Delphinapterus leucas Greenland |
genre_facet |
Baffin Bay Baffin Bay Baffin Beluga Beluga* Delphinapterus leucas Greenland |
op_source |
NAMMCO Scientific Publications, Vol 4, Iss 0, Pp 225-238 (2002) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2846 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2846 https://doaj.org/article/7e8b8b48ccdb4715824c5ce90c171442 |
op_doi |
https://doi.org/10.7557/3.2846 |
container_title |
NAMMCO Scientific Publications |
container_volume |
4 |
container_start_page |
225 |
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1766365244460892160 |