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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Language: | English |
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2007
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Online Access: | https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 https://doi.org/10.7557/3.2719 |
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/2719 2023-05-15T16:13:41+02:00 Status of grey seals (Halichoerus grypus) in Norway Nilssen, Kjell Tormod Haug, Tore 2007-01-01 application/pdf https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 https://doi.org/10.7557/3.2719 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719/2569 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 doi:10.7557/3.2719 Copyright (c) 2007 Kjell Tormod Nilssen, Tore Haug http://creativecommons.org/licenses/by/3.0/ CC-BY NAMMCO Scientific Publications; Vol 6: Grey seals in the North Atlantic and the Baltic; 23-31 2309-2491 1560-2206 10.7557/3.6 grey seals population status Norway info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2007 ftunitroemsoe https://doi.org/10.7557/3.2719 https://doi.org/10.7557/3.6 2021-08-16T16:39:00Z 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 University of Tromsø: Septentrio Academic Publishing Norway NAMMCO Scientific Publications 6 23 |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
grey seals population status Norway |
spellingShingle |
grey seals population status Norway Nilssen, Kjell Tormod Haug, Tore Status of grey seals (Halichoerus grypus) in Norway |
topic_facet |
grey seals population status Norway |
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 |
Nilssen, Kjell Tormod Haug, Tore |
author_facet |
Nilssen, Kjell Tormod Haug, Tore |
author_sort |
Nilssen, Kjell Tormod |
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://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 https://doi.org/10.7557/3.2719 |
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: Grey seals in the North Atlantic and the Baltic; 23-31 2309-2491 1560-2206 10.7557/3.6 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719/2569 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719 doi:10.7557/3.2719 |
op_rights |
Copyright (c) 2007 Kjell Tormod Nilssen, Tore Haug http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7557/3.2719 https://doi.org/10.7557/3.6 |
container_title |
NAMMCO Scientific Publications |
container_volume |
6 |
container_start_page |
23 |
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1765999498447814656 |