Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula
Abstract. The population of Tundra Swans (Cygnus columbianus columbianus) breeding on the lower Alaska Peninsula represents the southern extremity of the species' range and is uniquely nonmigratory. We used data on recaptures, resightings, and recoveries of neck-collared Tundra Swans on the low...
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Online Access: | http://dx.doi.org/10.1525/cond.2013.110213 http://academic.oup.com/condor/article-pdf/115/2/280/29161690/condor0280.pdf |
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croxfordunivpr:10.1525/cond.2013.110213 2023-10-29T02:35:53+01:00 Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula Meixell, Brandt W. Lindberg, Mark S. Conn, Paul B. Dau, Christian P. Sarvis, John E. Sowl, Kristine M. 2013 http://dx.doi.org/10.1525/cond.2013.110213 http://academic.oup.com/condor/article-pdf/115/2/280/29161690/condor0280.pdf en eng Oxford University Press (OUP) The Condor volume 115, issue 2, page 280-289 ISSN 0010-5422 1938-5129 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2013 croxfordunivpr https://doi.org/10.1525/cond.2013.110213 2023-09-29T10:54:38Z Abstract. The population of Tundra Swans (Cygnus columbianus columbianus) breeding on the lower Alaska Peninsula represents the southern extremity of the species' range and is uniquely nonmigratory. We used data on recaptures, resightings, and recoveries of neck-collared Tundra Swans on the lower Alaska Peninsula to estimate collar loss, annual apparent survival, and other demographic parameters for the years 1978– 1989. Annual collar loss was greater for adult males fitted with either the thinner collar type (0.34) or the thicker collar type (0.15) than for other age/sex classes (thinner: 0.10, thicker: 0.04). The apparent mean probability of survival of adults (0.61) was higher than that of immatures (0.41) and for both age classes varied considerably by year (adult range: 0.44–0.95, immature range: 0.25–0.90). To assess effects of permanent emigration by age and breeding class, we analyzed post hoc the encounter histories of swans known to breed in our study area. The apparent mean survival of known breeders (0.65) was generally higher than that of the entire marked sample but still varied considerably by year (range 0.26–1.00) and indicated that permanent emigration of breeding swans was likely. We suggest that reductions in apparent survival probability were influenced primarily by high and variable rates of permanent emigration and that immigration by swans from elsewhere may be important in sustaining a breeding population at and near Izembek National Wildlife Refuge. Article in Journal/Newspaper Cygnus columbianus Tundra Alaska Oxford University Press (via Crossref) The Condor 115 2 280 289 |
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Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Meixell, Brandt W. Lindberg, Mark S. Conn, Paul B. Dau, Christian P. Sarvis, John E. Sowl, Kristine M. Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract. The population of Tundra Swans (Cygnus columbianus columbianus) breeding on the lower Alaska Peninsula represents the southern extremity of the species' range and is uniquely nonmigratory. We used data on recaptures, resightings, and recoveries of neck-collared Tundra Swans on the lower Alaska Peninsula to estimate collar loss, annual apparent survival, and other demographic parameters for the years 1978– 1989. Annual collar loss was greater for adult males fitted with either the thinner collar type (0.34) or the thicker collar type (0.15) than for other age/sex classes (thinner: 0.10, thicker: 0.04). The apparent mean probability of survival of adults (0.61) was higher than that of immatures (0.41) and for both age classes varied considerably by year (adult range: 0.44–0.95, immature range: 0.25–0.90). To assess effects of permanent emigration by age and breeding class, we analyzed post hoc the encounter histories of swans known to breed in our study area. The apparent mean survival of known breeders (0.65) was generally higher than that of the entire marked sample but still varied considerably by year (range 0.26–1.00) and indicated that permanent emigration of breeding swans was likely. We suggest that reductions in apparent survival probability were influenced primarily by high and variable rates of permanent emigration and that immigration by swans from elsewhere may be important in sustaining a breeding population at and near Izembek National Wildlife Refuge. |
format |
Article in Journal/Newspaper |
author |
Meixell, Brandt W. Lindberg, Mark S. Conn, Paul B. Dau, Christian P. Sarvis, John E. Sowl, Kristine M. |
author_facet |
Meixell, Brandt W. Lindberg, Mark S. Conn, Paul B. Dau, Christian P. Sarvis, John E. Sowl, Kristine M. |
author_sort |
Meixell, Brandt W. |
title |
Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula |
title_short |
Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula |
title_full |
Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula |
title_fullStr |
Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula |
title_full_unstemmed |
Age-Specific Survival of Tundra Swans on the Lower Alaska Peninsula |
title_sort |
age-specific survival of tundra swans on the lower alaska peninsula |
publisher |
Oxford University Press (OUP) |
publishDate |
2013 |
url |
http://dx.doi.org/10.1525/cond.2013.110213 http://academic.oup.com/condor/article-pdf/115/2/280/29161690/condor0280.pdf |
genre |
Cygnus columbianus Tundra Alaska |
genre_facet |
Cygnus columbianus Tundra Alaska |
op_source |
The Condor volume 115, issue 2, page 280-289 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1525/cond.2013.110213 |
container_title |
The Condor |
container_volume |
115 |
container_issue |
2 |
container_start_page |
280 |
op_container_end_page |
289 |
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1781059373245661184 |