Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population
High survival and breeding philopatry was previously confirmed for the Adélie penguin (Pygoscelis adeliae) during a period of stable environmental conditions. However, movements of breeding adults as a result of an unplanned natural experiment within a four-colony meta-population provided interestin...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901434 http://www.ncbi.nlm.nih.gov/pubmed/20566874 https://doi.org/10.1073/pnas.1000623107 |
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ftpubmed:oai:pubmedcentral.nih.gov:2901434 2023-05-15T18:03:50+02:00 Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population Dugger, Katie M. Ainley, David G. Lyver, Phil O'B. Barton, Kerry Ballard, Grant 2010-06-21 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901434 http://www.ncbi.nlm.nih.gov/pubmed/20566874 https://doi.org/10.1073/pnas.1000623107 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901434 http://www.ncbi.nlm.nih.gov/pubmed/20566874 http://dx.doi.org/10.1073/pnas.1000623107 Biological Sciences Text 2010 ftpubmed https://doi.org/10.1073/pnas.1000623107 2013-09-03T02:27:23Z High survival and breeding philopatry was previously confirmed for the Adélie penguin (Pygoscelis adeliae) during a period of stable environmental conditions. However, movements of breeding adults as a result of an unplanned natural experiment within a four-colony meta-population provided interesting insights into this species’ population dynamics. We used multistate mark-recapture models to investigate apparent survival and dispersal of breeding birds in the southwestern Ross Sea during 12 breeding seasons (1996–2007). The natural experiment was facilitated by the temporary grounding of two immense icebergs that (i) erected a veritable fence separating colonies and altering migration routes and (ii) added additional stress by trapping extensive sea ice in the region during 5 of 12 y. Colony size varied by orders of magnitude, allowing investigation of apparent survival and dispersal rates in relation to both environmental conditions and colony size within this meta-population. Apparent survival was lowest for the smallest colony (4,000 pairs) and similar for the medium (45,000 pairs) and large colonies (155,000 pairs), despite increased foraging effort expended by breeders at the largest colony. Dispersal of breeding birds was low (<1%), except during years of difficult environmental conditions when movements increased, especially away from the smallest colony (3.5%). Decreased apparent survival at the smallest colony could reflect differences in migration chronology and winter habitat use compared with the other colonies, or it may reflect increased permanent emigration to colonies outside this meta-population. Contrary to current thought, breeding penguins are not always philopatric. Rather, stressful conditions can significantly increase dispersal rates. Text Pygoscelis adeliae Ross Sea Sea ice PubMed Central (PMC) Ross Sea Proceedings of the National Academy of Sciences 107 27 12375 12380 |
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Biological Sciences Dugger, Katie M. Ainley, David G. Lyver, Phil O'B. Barton, Kerry Ballard, Grant Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population |
topic_facet |
Biological Sciences |
description |
High survival and breeding philopatry was previously confirmed for the Adélie penguin (Pygoscelis adeliae) during a period of stable environmental conditions. However, movements of breeding adults as a result of an unplanned natural experiment within a four-colony meta-population provided interesting insights into this species’ population dynamics. We used multistate mark-recapture models to investigate apparent survival and dispersal of breeding birds in the southwestern Ross Sea during 12 breeding seasons (1996–2007). The natural experiment was facilitated by the temporary grounding of two immense icebergs that (i) erected a veritable fence separating colonies and altering migration routes and (ii) added additional stress by trapping extensive sea ice in the region during 5 of 12 y. Colony size varied by orders of magnitude, allowing investigation of apparent survival and dispersal rates in relation to both environmental conditions and colony size within this meta-population. Apparent survival was lowest for the smallest colony (4,000 pairs) and similar for the medium (45,000 pairs) and large colonies (155,000 pairs), despite increased foraging effort expended by breeders at the largest colony. Dispersal of breeding birds was low (<1%), except during years of difficult environmental conditions when movements increased, especially away from the smallest colony (3.5%). Decreased apparent survival at the smallest colony could reflect differences in migration chronology and winter habitat use compared with the other colonies, or it may reflect increased permanent emigration to colonies outside this meta-population. Contrary to current thought, breeding penguins are not always philopatric. Rather, stressful conditions can significantly increase dispersal rates. |
format |
Text |
author |
Dugger, Katie M. Ainley, David G. Lyver, Phil O'B. Barton, Kerry Ballard, Grant |
author_facet |
Dugger, Katie M. Ainley, David G. Lyver, Phil O'B. Barton, Kerry Ballard, Grant |
author_sort |
Dugger, Katie M. |
title |
Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population |
title_short |
Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population |
title_full |
Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population |
title_fullStr |
Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population |
title_full_unstemmed |
Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population |
title_sort |
survival differences and the effect of environmental instability on breeding dispersal in an adélie penguin meta-population |
publisher |
National Academy of Sciences |
publishDate |
2010 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901434 http://www.ncbi.nlm.nih.gov/pubmed/20566874 https://doi.org/10.1073/pnas.1000623107 |
geographic |
Ross Sea |
geographic_facet |
Ross Sea |
genre |
Pygoscelis adeliae Ross Sea Sea ice |
genre_facet |
Pygoscelis adeliae Ross Sea Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901434 http://www.ncbi.nlm.nih.gov/pubmed/20566874 http://dx.doi.org/10.1073/pnas.1000623107 |
op_doi |
https://doi.org/10.1073/pnas.1000623107 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
107 |
container_issue |
27 |
container_start_page |
12375 |
op_container_end_page |
12380 |
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1766174845056319488 |