Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction
1. Aerial surveys have detected alarming declines in counts of harbour seals in several regions across Scotland. 2. Demographic data and simple models were used to examine the recent decline in the numbers of harbour seals counted in one population within a Special Area of Conservation (SAC) on the...
Published in: | Aquatic Conservation: Marine and Freshwater Ecosystems |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/harbour-seal-phoca-vitulina-abundance-within-the-firth-of-tay-and-eden-estuary-scotland(3348de89-386e-4abc-8da8-9dd47e0d29fe).html https://doi.org/10.1002/aqc.2609 https://research-repository.st-andrews.ac.uk/bitstream/10023/9953/1/Hanson_HarbourSeal_ACM_FE_AM.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/3348de89-386e-4abc-8da8-9dd47e0d29fe 2024-06-23T07:53:31+00:00 Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction Hanson, Nora Thompson, Dave Duck, Callan Baxter, John Lonergan, Mike 2017-02-17 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/harbour-seal-phoca-vitulina-abundance-within-the-firth-of-tay-and-eden-estuary-scotland(3348de89-386e-4abc-8da8-9dd47e0d29fe).html https://doi.org/10.1002/aqc.2609 https://research-repository.st-andrews.ac.uk/bitstream/10023/9953/1/Hanson_HarbourSeal_ACM_FE_AM.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/harbour-seal-phoca-vitulina-abundance-within-the-firth-of-tay-and-eden-estuary-scotland(3348de89-386e-4abc-8da8-9dd47e0d29fe).html info:eu-repo/semantics/openAccess Hanson , N , Thompson , D , Duck , C , Baxter , J & Lonergan , M 2017 , ' Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland : recent trends and extrapolation to extinction ' , Aquatic Conservation: Marine and Freshwater Ecosystems , vol. 27 , no. 1 , pp. 268-281 . https://doi.org/10.1002/aqc.2609 Coastal Littoral Monitoring Special Area of Conservation Conservation evaluation Mammals article 2017 ftunstandrewcris https://doi.org/10.1002/aqc.2609 2024-06-13T00:49:49Z 1. Aerial surveys have detected alarming declines in counts of harbour seals in several regions across Scotland. 2. Demographic data and simple models were used to examine the recent decline in the numbers of harbour seals counted in one population within a Special Area of Conservation (SAC) on the east coast of Scotland. The models suggest that the continuation of current trends would result in the species effectively disappearing from this area within the next 20 years. 3. While the cause of the decline is unknown, it must be reducing adult survival because the high rate of decline cannot be wholly accounted for by changes in other demographic parameters. 4. Recovery of the population to the abundance recorded at the time the SAC was designated (2005) is likely to take at least 40 years, even if the cause of the decline is immediately identified and removed. 5. The models suggest that partial removal of the cause can have only limited benefits to population recovery, and there are unlikely to be any long-term benefits from introducing or reintroducing additional individuals while the underlying problem persists. Therefore, if the population of harbour seals in this area is to recover it is essential that the sources of the increased mortality are identified and measures are put in place to manage these. Article in Journal/Newspaper harbour seal Phoca vitulina University of St Andrews: Research Portal Firth of Tay ENVELOPE(-55.567,-55.567,-63.350,-63.350) Tay ENVELOPE(-55.750,-55.750,-63.367,-63.367) Aquatic Conservation: Marine and Freshwater Ecosystems 27 1 268 281 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Coastal Littoral Monitoring Special Area of Conservation Conservation evaluation Mammals |
spellingShingle |
Coastal Littoral Monitoring Special Area of Conservation Conservation evaluation Mammals Hanson, Nora Thompson, Dave Duck, Callan Baxter, John Lonergan, Mike Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction |
topic_facet |
Coastal Littoral Monitoring Special Area of Conservation Conservation evaluation Mammals |
description |
1. Aerial surveys have detected alarming declines in counts of harbour seals in several regions across Scotland. 2. Demographic data and simple models were used to examine the recent decline in the numbers of harbour seals counted in one population within a Special Area of Conservation (SAC) on the east coast of Scotland. The models suggest that the continuation of current trends would result in the species effectively disappearing from this area within the next 20 years. 3. While the cause of the decline is unknown, it must be reducing adult survival because the high rate of decline cannot be wholly accounted for by changes in other demographic parameters. 4. Recovery of the population to the abundance recorded at the time the SAC was designated (2005) is likely to take at least 40 years, even if the cause of the decline is immediately identified and removed. 5. The models suggest that partial removal of the cause can have only limited benefits to population recovery, and there are unlikely to be any long-term benefits from introducing or reintroducing additional individuals while the underlying problem persists. Therefore, if the population of harbour seals in this area is to recover it is essential that the sources of the increased mortality are identified and measures are put in place to manage these. |
format |
Article in Journal/Newspaper |
author |
Hanson, Nora Thompson, Dave Duck, Callan Baxter, John Lonergan, Mike |
author_facet |
Hanson, Nora Thompson, Dave Duck, Callan Baxter, John Lonergan, Mike |
author_sort |
Hanson, Nora |
title |
Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction |
title_short |
Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction |
title_full |
Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction |
title_fullStr |
Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction |
title_full_unstemmed |
Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland:recent trends and extrapolation to extinction |
title_sort |
harbour seal ( phoca vitulina ) abundance within the firth of tay and eden estuary, scotland:recent trends and extrapolation to extinction |
publishDate |
2017 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/harbour-seal-phoca-vitulina-abundance-within-the-firth-of-tay-and-eden-estuary-scotland(3348de89-386e-4abc-8da8-9dd47e0d29fe).html https://doi.org/10.1002/aqc.2609 https://research-repository.st-andrews.ac.uk/bitstream/10023/9953/1/Hanson_HarbourSeal_ACM_FE_AM.pdf |
long_lat |
ENVELOPE(-55.567,-55.567,-63.350,-63.350) ENVELOPE(-55.750,-55.750,-63.367,-63.367) |
geographic |
Firth of Tay Tay |
geographic_facet |
Firth of Tay Tay |
genre |
harbour seal Phoca vitulina |
genre_facet |
harbour seal Phoca vitulina |
op_source |
Hanson , N , Thompson , D , Duck , C , Baxter , J & Lonergan , M 2017 , ' Harbour seal ( Phoca vitulina ) abundance within the Firth of Tay and Eden Estuary, Scotland : recent trends and extrapolation to extinction ' , Aquatic Conservation: Marine and Freshwater Ecosystems , vol. 27 , no. 1 , pp. 268-281 . https://doi.org/10.1002/aqc.2609 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/harbour-seal-phoca-vitulina-abundance-within-the-firth-of-tay-and-eden-estuary-scotland(3348de89-386e-4abc-8da8-9dd47e0d29fe).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/aqc.2609 |
container_title |
Aquatic Conservation: Marine and Freshwater Ecosystems |
container_volume |
27 |
container_issue |
1 |
container_start_page |
268 |
op_container_end_page |
281 |
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1802645236805009408 |