Status of grey seals ( Halichoerus grypus ) in Norway
During the period September-December in 2001-2003, ship based surveys of grey seal (Halichoerus grypus) pups, including tagging, counting and staging of pups, were conducted along the Norwegian coast. All known and other potential breeding areas were surveyed from Rogaland county in the south to Fin...
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ftdoajarticles:oai:doaj.org/article:7966a544804b437abbb1ef1792f3bf59 2023-05-15T16:13:42+02:00 Status of grey seals ( Halichoerus grypus ) in Norway Kjell Tormod Nilssen Tore Haug 2007-01-01T00:00:00Z https://doi.org/10.7557/3.2719 https://doaj.org/article/7966a544804b437abbb1ef1792f3bf59 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2719 https://doaj.org/article/7966a544804b437abbb1ef1792f3bf59 NAMMCO Scientific Publications, Vol 6, Iss 0, Pp 23-31 (2007) grey seals population status Norway Ecology QH540-549.5 article 2007 ftdoajarticles https://doi.org/10.7557/3.2719 2022-12-31T14:23:38Z During the period September-December in 2001-2003, ship based surveys of grey seal (Halichoerus grypus) pups, including tagging, counting and staging of pups, were conducted along the Norwegian coast. All known and other potential breeding areas were surveyed from Rogaland county in the south to Finnmark county in the north. Most of the breeding sites were surveyed only once, but some sites were surveyed 2-4 times. The investigations resulted in a total minimum estimate of 1,159 grey seal pups born in Norwegian waters. Nordland county was the most important breeding area where about 50% of the pups were born. Total population estimates were derived from the recorded number of pups born using a range of multipliers (4.0-4.7), based on observed annual growth rates of approximately 7-12% in other grey seal populations. This gave a total estimate of about 5,800-6,600 grey seals including pups in Norwegian waters. However, the total pup production was probably underestimated due to only one pup count in most of the breeding sites. Observed mean pup mortality was 1.1% during the breeding season along the Norwegian coast. Article in Journal/Newspaper Finnmark Nordland Nordland Finnmark Nordland Directory of Open Access Journals: DOAJ Articles Norway NAMMCO Scientific Publications 6 23 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
grey seals population status Norway Ecology QH540-549.5 |
spellingShingle |
grey seals population status Norway Ecology QH540-549.5 Kjell Tormod Nilssen Tore Haug Status of grey seals ( Halichoerus grypus ) in Norway |
topic_facet |
grey seals population status Norway Ecology QH540-549.5 |
description |
During the period September-December in 2001-2003, ship based surveys of grey seal (Halichoerus grypus) pups, including tagging, counting and staging of pups, were conducted along the Norwegian coast. All known and other potential breeding areas were surveyed from Rogaland county in the south to Finnmark county in the north. Most of the breeding sites were surveyed only once, but some sites were surveyed 2-4 times. The investigations resulted in a total minimum estimate of 1,159 grey seal pups born in Norwegian waters. Nordland county was the most important breeding area where about 50% of the pups were born. Total population estimates were derived from the recorded number of pups born using a range of multipliers (4.0-4.7), based on observed annual growth rates of approximately 7-12% in other grey seal populations. This gave a total estimate of about 5,800-6,600 grey seals including pups in Norwegian waters. However, the total pup production was probably underestimated due to only one pup count in most of the breeding sites. Observed mean pup mortality was 1.1% during the breeding season along the Norwegian coast. |
format |
Article in Journal/Newspaper |
author |
Kjell Tormod Nilssen Tore Haug |
author_facet |
Kjell Tormod Nilssen Tore Haug |
author_sort |
Kjell Tormod Nilssen |
title |
Status of grey seals ( Halichoerus grypus ) in Norway |
title_short |
Status of grey seals ( Halichoerus grypus ) in Norway |
title_full |
Status of grey seals ( Halichoerus grypus ) in Norway |
title_fullStr |
Status of grey seals ( Halichoerus grypus ) in Norway |
title_full_unstemmed |
Status of grey seals ( Halichoerus grypus ) in Norway |
title_sort |
status of grey seals ( halichoerus grypus ) in norway |
publisher |
Septentrio Academic Publishing |
publishDate |
2007 |
url |
https://doi.org/10.7557/3.2719 https://doaj.org/article/7966a544804b437abbb1ef1792f3bf59 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Finnmark Nordland Nordland Finnmark Nordland |
genre_facet |
Finnmark Nordland Nordland Finnmark Nordland |
op_source |
NAMMCO Scientific Publications, Vol 6, Iss 0, Pp 23-31 (2007) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2719 https://doaj.org/article/7966a544804b437abbb1ef1792f3bf59 |
op_doi |
https://doi.org/10.7557/3.2719 |
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NAMMCO Scientific Publications |
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6 |
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23 |
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1765999518843666432 |