Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element
Abstract Teilmann, J., Rigét, F., and Harkonen, T. 2010. Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element. – ICES Journal of Marine Science, 67: 952–958. To be successful, conservation and management programmes require accurate data on abunda...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsq001 http://academic.oup.com/icesjms/article-pdf/67/5/952/29135858/fsq001.pdf |
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croxfordunivpr:10.1093/icesjms/fsq001 2024-10-13T14:07:53+00:00 Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element Teilmann, Jonas Rigét, Frank Harkonen, Tero 2010 http://dx.doi.org/10.1093/icesjms/fsq001 http://academic.oup.com/icesjms/article-pdf/67/5/952/29135858/fsq001.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by-nc/2.5/ ICES Journal of Marine Science volume 67, issue 5, page 952-958 ISSN 1095-9289 1054-3139 journal-article 2010 croxfordunivpr https://doi.org/10.1093/icesjms/fsq001 2024-09-17T04:28:16Z Abstract Teilmann, J., Rigét, F., and Harkonen, T. 2010. Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element. – ICES Journal of Marine Science, 67: 952–958. To be successful, conservation and management programmes require accurate data on abundance and population trends. Noise caused by within- and among-year variance should be minimized to optimize the statistical power for detecting changes in abundance. A total of 30 years of monitoring data from seven distinct subpopulations of harbour seals (Phoca vitulina) in southern Scandinavia was used to investigate the relative contributions of factors affecting the power to detect trends in abundance. The power is typically doubled under the conditions tested when carrying out annual surveys compared with every second year. The power also increases substantially when carrying out replicate surveys during the annual moult. The gain in power increases steeply up to three annual replicates, but then levels off, and it is further increased when the mean of the two highest counts of three annually repeated counts is used. We propose that harbour seal haul-out sites are surveyed every year during the moult, with at least three replicate surveys per year. This would provide robust data for analyses of population trends, facilitating management and identification of potential influences of diseases and anthropogenic activities. Article in Journal/Newspaper harbour seal Phoca vitulina Oxford University Press ICES Journal of Marine Science 67 5 952 958 |
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English |
description |
Abstract Teilmann, J., Rigét, F., and Harkonen, T. 2010. Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element. – ICES Journal of Marine Science, 67: 952–958. To be successful, conservation and management programmes require accurate data on abundance and population trends. Noise caused by within- and among-year variance should be minimized to optimize the statistical power for detecting changes in abundance. A total of 30 years of monitoring data from seven distinct subpopulations of harbour seals (Phoca vitulina) in southern Scandinavia was used to investigate the relative contributions of factors affecting the power to detect trends in abundance. The power is typically doubled under the conditions tested when carrying out annual surveys compared with every second year. The power also increases substantially when carrying out replicate surveys during the annual moult. The gain in power increases steeply up to three annual replicates, but then levels off, and it is further increased when the mean of the two highest counts of three annually repeated counts is used. We propose that harbour seal haul-out sites are surveyed every year during the moult, with at least three replicate surveys per year. This would provide robust data for analyses of population trends, facilitating management and identification of potential influences of diseases and anthropogenic activities. |
format |
Article in Journal/Newspaper |
author |
Teilmann, Jonas Rigét, Frank Harkonen, Tero |
spellingShingle |
Teilmann, Jonas Rigét, Frank Harkonen, Tero Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element |
author_facet |
Teilmann, Jonas Rigét, Frank Harkonen, Tero |
author_sort |
Teilmann, Jonas |
title |
Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element |
title_short |
Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element |
title_full |
Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element |
title_fullStr |
Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element |
title_full_unstemmed |
Optimizing survey design for Scandinavian harbour seals: population trend as an ecological quality element |
title_sort |
optimizing survey design for scandinavian harbour seals: population trend as an ecological quality element |
publisher |
Oxford University Press (OUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1093/icesjms/fsq001 http://academic.oup.com/icesjms/article-pdf/67/5/952/29135858/fsq001.pdf |
genre |
harbour seal Phoca vitulina |
genre_facet |
harbour seal Phoca vitulina |
op_source |
ICES Journal of Marine Science volume 67, issue 5, page 952-958 ISSN 1095-9289 1054-3139 |
op_rights |
http://creativecommons.org/licenses/by-nc/2.5/ |
op_doi |
https://doi.org/10.1093/icesjms/fsq001 |
container_title |
ICES Journal of Marine Science |
container_volume |
67 |
container_issue |
5 |
container_start_page |
952 |
op_container_end_page |
958 |
_version_ |
1812814433387282432 |