Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland
Identifying temporal and spatial patterns in demography is critical to understanding long‐term fluctuations in population size. Common Eider Somateria mollissima numbers have shown a long‐term decline, resulting in the species being uplisted in 2015 to ‘Endangered’ within European Union countries. O...
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crwiley:10.1111/ibi.12893 2024-09-15T18:02:40+00:00 Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland Wood, Kevin A. Thorstensen, Sverrir Lúðvíksson, Smári J. Brides, Kane Petersen, Aevar 2020 http://dx.doi.org/10.1111/ibi.12893 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12893 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ibi.12893 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 163, issue 2, page 671-683 ISSN 0019-1019 1474-919X journal-article 2020 crwiley https://doi.org/10.1111/ibi.12893 2024-08-20T04:12:38Z Identifying temporal and spatial patterns in demography is critical to understanding long‐term fluctuations in population size. Common Eider Somateria mollissima numbers have shown a long‐term decline, resulting in the species being uplisted in 2015 to ‘Endangered’ within European Union countries. Obtaining improved estimates of survival rates of Common Eiders (and other seaducks) has been identified as a priority to improve our understanding of the demographic causes of the observed global decreases in population size and to inform conservation efforts. In this study, we used long‐term (1982–2017) mark–recovery data on 3018 individuals from three breeding colonies in Iceland to quantify the spatial and temporal variation in the annual true survival rates of adult female Common Eider. Model comparison using an information‐theoretic approach indicated that true survival and recovery rates varied between years and colonies but showed no consistent temporal pattern across the three colonies. Geometric mean (± se) annual true survival across our three breeding colonies was 0.916 ± 0.017 (95% confidence interval (CI) = 0.819–0.961), with a mean life expectancy of 11.8 years (95% CI 5.4–25.2). Our survival estimates were relatively high compared with those reported previously for many other Common Eider populations, which may reflect their protected status, low predation pressure and high food availability on Iceland and its surrounding waters. Our findings provide spatially and temporally explicit demographic information needed to help conservationists understand the local and global declines in Common Eider populations. Article in Journal/Newspaper Common Eider Iceland Somateria mollissima Wiley Online Library Ibis 163 2 671 683 |
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English |
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Identifying temporal and spatial patterns in demography is critical to understanding long‐term fluctuations in population size. Common Eider Somateria mollissima numbers have shown a long‐term decline, resulting in the species being uplisted in 2015 to ‘Endangered’ within European Union countries. Obtaining improved estimates of survival rates of Common Eiders (and other seaducks) has been identified as a priority to improve our understanding of the demographic causes of the observed global decreases in population size and to inform conservation efforts. In this study, we used long‐term (1982–2017) mark–recovery data on 3018 individuals from three breeding colonies in Iceland to quantify the spatial and temporal variation in the annual true survival rates of adult female Common Eider. Model comparison using an information‐theoretic approach indicated that true survival and recovery rates varied between years and colonies but showed no consistent temporal pattern across the three colonies. Geometric mean (± se) annual true survival across our three breeding colonies was 0.916 ± 0.017 (95% confidence interval (CI) = 0.819–0.961), with a mean life expectancy of 11.8 years (95% CI 5.4–25.2). Our survival estimates were relatively high compared with those reported previously for many other Common Eider populations, which may reflect their protected status, low predation pressure and high food availability on Iceland and its surrounding waters. Our findings provide spatially and temporally explicit demographic information needed to help conservationists understand the local and global declines in Common Eider populations. |
format |
Article in Journal/Newspaper |
author |
Wood, Kevin A. Thorstensen, Sverrir Lúðvíksson, Smári J. Brides, Kane Petersen, Aevar |
spellingShingle |
Wood, Kevin A. Thorstensen, Sverrir Lúðvíksson, Smári J. Brides, Kane Petersen, Aevar Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland |
author_facet |
Wood, Kevin A. Thorstensen, Sverrir Lúðvíksson, Smári J. Brides, Kane Petersen, Aevar |
author_sort |
Wood, Kevin A. |
title |
Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland |
title_short |
Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland |
title_full |
Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland |
title_fullStr |
Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland |
title_full_unstemmed |
Long‐term trends in the survival rates of adult female Common Eider Somateria mollissimaat three colonies in Iceland |
title_sort |
long‐term trends in the survival rates of adult female common eider somateria mollissimaat three colonies in iceland |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/ibi.12893 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12893 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ibi.12893 |
genre |
Common Eider Iceland Somateria mollissima |
genre_facet |
Common Eider Iceland Somateria mollissima |
op_source |
Ibis volume 163, issue 2, page 671-683 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ibi.12893 |
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Ibis |
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163 |
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2 |
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671 |
op_container_end_page |
683 |
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1810440107028643840 |