Abundance of Northwest Atlantic grey seals in Canadian waters
Northwest Atlantic grey seals form a single stock, but for management purposes are often considered as 2 groups. The largest group whelps on Sable Island, 290 km east of Halifax, Nova Scotia. The second group referred to as ‘non-Sable Island’ or ‘Gulf’ animals whelps primarily on the pack ice in the...
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/2726 2023-05-15T17:45:29+02:00 Abundance of Northwest Atlantic grey seals in Canadian waters Hammill, M O Gosselin, J F Stenson, G B 2007-01-01 application/pdf https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2726 https://doi.org/10.7557/3.2726 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2726/2575 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2726 doi:10.7557/3.2726 Copyright (c) 2007 M O Hammill, J F Gosselin, G B Stenson http://creativecommons.org/licenses/by/3.0/ CC-BY NAMMCO Scientific Publications; Vol 6: Grey seals in the North Atlantic and the Baltic; 99-115 2309-2491 1560-2206 10.7557/3.6 grey seals Canada abundance surveys info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2007 ftunitroemsoe https://doi.org/10.7557/3.2726 https://doi.org/10.7557/3.6 2021-08-16T16:39:00Z Northwest Atlantic grey seals form a single stock, but for management purposes are often considered as 2 groups. The largest group whelps on Sable Island, 290 km east of Halifax, Nova Scotia. The second group referred to as ‘non-Sable Island’ or ‘Gulf’ animals whelps primarily on the pack ice in the southern Gulf of St. Lawrence, with other smaller groups pupping on small islands in the southern Gulf and along the eastern shore of Nova Scotia. Estimates of pup production in this latter group have been determined using mark-recapture and aerial survey techniques. The most recent visual aerial surveys flown during January-February 1996, 1997 and 2000 in the southern Gulf of St Lawrence and along the Eastern Shore resulted in pup production estimates of 11,100 (SE = 1,300), 7,300 (SE = 800) and 6,100 (SE = 900) in 1996, 1997 and 2000 respectively after correcting for births and including counts of pups on small islands. Incorporating information on pup production, reproduction rates and removals into a population model indicates that the Gulf component increased from 15,500 (95% CI = 14,600-16,300) animals in 1970 to 62,700 (95% CI = 49,800-67,800) animals by 1996 and then declined to 22,300 (95% CI = 17,200-28,300) animals in 2000. On Sable Island the population has increased from 4,800 (95% CI = 4,700-4,900) animals in 1970 to 212,500 (95% CI = 159,600-276,200) in 2000. The total Northwest Atlantic grey seal population is estimated to number around 234,800 animals in 2000. Article in Journal/Newspaper Northwest Atlantic University of Tromsø: Septentrio Academic Publishing Canada NAMMCO Scientific Publications 6 99 |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
grey seals Canada abundance surveys |
spellingShingle |
grey seals Canada abundance surveys Hammill, M O Gosselin, J F Stenson, G B Abundance of Northwest Atlantic grey seals in Canadian waters |
topic_facet |
grey seals Canada abundance surveys |
description |
Northwest Atlantic grey seals form a single stock, but for management purposes are often considered as 2 groups. The largest group whelps on Sable Island, 290 km east of Halifax, Nova Scotia. The second group referred to as ‘non-Sable Island’ or ‘Gulf’ animals whelps primarily on the pack ice in the southern Gulf of St. Lawrence, with other smaller groups pupping on small islands in the southern Gulf and along the eastern shore of Nova Scotia. Estimates of pup production in this latter group have been determined using mark-recapture and aerial survey techniques. The most recent visual aerial surveys flown during January-February 1996, 1997 and 2000 in the southern Gulf of St Lawrence and along the Eastern Shore resulted in pup production estimates of 11,100 (SE = 1,300), 7,300 (SE = 800) and 6,100 (SE = 900) in 1996, 1997 and 2000 respectively after correcting for births and including counts of pups on small islands. Incorporating information on pup production, reproduction rates and removals into a population model indicates that the Gulf component increased from 15,500 (95% CI = 14,600-16,300) animals in 1970 to 62,700 (95% CI = 49,800-67,800) animals by 1996 and then declined to 22,300 (95% CI = 17,200-28,300) animals in 2000. On Sable Island the population has increased from 4,800 (95% CI = 4,700-4,900) animals in 1970 to 212,500 (95% CI = 159,600-276,200) in 2000. The total Northwest Atlantic grey seal population is estimated to number around 234,800 animals in 2000. |
format |
Article in Journal/Newspaper |
author |
Hammill, M O Gosselin, J F Stenson, G B |
author_facet |
Hammill, M O Gosselin, J F Stenson, G B |
author_sort |
Hammill, M O |
title |
Abundance of Northwest Atlantic grey seals in Canadian waters |
title_short |
Abundance of Northwest Atlantic grey seals in Canadian waters |
title_full |
Abundance of Northwest Atlantic grey seals in Canadian waters |
title_fullStr |
Abundance of Northwest Atlantic grey seals in Canadian waters |
title_full_unstemmed |
Abundance of Northwest Atlantic grey seals in Canadian waters |
title_sort |
abundance of northwest atlantic grey seals in canadian waters |
publisher |
Septentrio Academic Publishing |
publishDate |
2007 |
url |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2726 https://doi.org/10.7557/3.2726 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
NAMMCO Scientific Publications; Vol 6: Grey seals in the North Atlantic and the Baltic; 99-115 2309-2491 1560-2206 10.7557/3.6 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2726/2575 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2726 doi:10.7557/3.2726 |
op_rights |
Copyright (c) 2007 M O Hammill, J F Gosselin, G B Stenson http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7557/3.2726 https://doi.org/10.7557/3.6 |
container_title |
NAMMCO Scientific Publications |
container_volume |
6 |
container_start_page |
99 |
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1766148533186985984 |