Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska
Steller sea lions Eumetopias jubatus in the Glacier Bay region of northern Southeast Alaska experience greater survival and more rapid population growth than sea lions elsewhere in this region. To better understand demographics of sea lions in the region, and to describe the origins and behavior of...
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Online Access: | https://doi.org/10.3354/esr00909 https://doaj.org/article/c3fcdf040a874f98b4e24e3a3f29d3e8 |
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ftdoajarticles:oai:doaj.org/article:c3fcdf040a874f98b4e24e3a3f29d3e8 2023-05-15T16:20:18+02:00 Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska Rehberg, M Jemison, L Womble, JN O’Corry-Crowe, G 2018-09-01T00:00:00Z https://doi.org/10.3354/esr00909 https://doaj.org/article/c3fcdf040a874f98b4e24e3a3f29d3e8 EN eng Inter-Research https://www.int-res.com/abstracts/esr/v37/p11-24/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr00909 https://doaj.org/article/c3fcdf040a874f98b4e24e3a3f29d3e8 Endangered Species Research, Vol 37, Pp 11-24 (2018) Zoology QL1-991 Botany QK1-989 article 2018 ftdoajarticles https://doi.org/10.3354/esr00909 2022-12-31T11:30:22Z Steller sea lions Eumetopias jubatus in the Glacier Bay region of northern Southeast Alaska experience greater survival and more rapid population growth than sea lions elsewhere in this region. To better understand demographics of sea lions in the region, and to describe the origins and behavior of sea lions and relate these descriptions to previous studies, we studied genetic origins, residency, foraging range, diving behavior, and dispersal of immature sea lions (≤24 mo of age) captured in Glacier Bay. Fifty-two percent of individuals had maternal origins in the distant (550 km) endangered western population rather than in the local recovered eastern population. During winter, 5 mo old pups, dependent on their dams for nutrition, remained within Glacier Bay, diving to shallow depths (≤108 m) mainly during daylight, whereas older (17 mo old) juveniles ranged more widely to areas of known seasonal prey aggregations, performing deep (≥241 m) nocturnal dives. Both pups and juveniles remained within the northern portion of Southeast Alaska, in contrast to farther-ranging pup and juvenile sea lions captured elsewhere in Southeast Alaska. Over the long term, females from Glacier Bay remained within this northern area through maturity and were sighted breeding in this area only. Restricted ranging patterns and natal and breeding philopatry by Steller sea lions of both eastern and western distinct population segment origin in the Glacier Bay region reveal that optimal foraging and breeding conditions likely prevail and help explain the recent colonization, increased survival, and rapid population growth of this species in the region. Article in Journal/Newspaper glacier Alaska Directory of Open Access Journals: DOAJ Articles Glacier Bay Endangered Species Research 37 11 24 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Zoology QL1-991 Botany QK1-989 |
spellingShingle |
Zoology QL1-991 Botany QK1-989 Rehberg, M Jemison, L Womble, JN O’Corry-Crowe, G Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska |
topic_facet |
Zoology QL1-991 Botany QK1-989 |
description |
Steller sea lions Eumetopias jubatus in the Glacier Bay region of northern Southeast Alaska experience greater survival and more rapid population growth than sea lions elsewhere in this region. To better understand demographics of sea lions in the region, and to describe the origins and behavior of sea lions and relate these descriptions to previous studies, we studied genetic origins, residency, foraging range, diving behavior, and dispersal of immature sea lions (≤24 mo of age) captured in Glacier Bay. Fifty-two percent of individuals had maternal origins in the distant (550 km) endangered western population rather than in the local recovered eastern population. During winter, 5 mo old pups, dependent on their dams for nutrition, remained within Glacier Bay, diving to shallow depths (≤108 m) mainly during daylight, whereas older (17 mo old) juveniles ranged more widely to areas of known seasonal prey aggregations, performing deep (≥241 m) nocturnal dives. Both pups and juveniles remained within the northern portion of Southeast Alaska, in contrast to farther-ranging pup and juvenile sea lions captured elsewhere in Southeast Alaska. Over the long term, females from Glacier Bay remained within this northern area through maturity and were sighted breeding in this area only. Restricted ranging patterns and natal and breeding philopatry by Steller sea lions of both eastern and western distinct population segment origin in the Glacier Bay region reveal that optimal foraging and breeding conditions likely prevail and help explain the recent colonization, increased survival, and rapid population growth of this species in the region. |
format |
Article in Journal/Newspaper |
author |
Rehberg, M Jemison, L Womble, JN O’Corry-Crowe, G |
author_facet |
Rehberg, M Jemison, L Womble, JN O’Corry-Crowe, G |
author_sort |
Rehberg, M |
title |
Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska |
title_short |
Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska |
title_full |
Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska |
title_fullStr |
Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska |
title_full_unstemmed |
Winter movements and long-term dispersal of Steller sea lions in the Glacier Bay region of Southeast Alaska |
title_sort |
winter movements and long-term dispersal of steller sea lions in the glacier bay region of southeast alaska |
publisher |
Inter-Research |
publishDate |
2018 |
url |
https://doi.org/10.3354/esr00909 https://doaj.org/article/c3fcdf040a874f98b4e24e3a3f29d3e8 |
geographic |
Glacier Bay |
geographic_facet |
Glacier Bay |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
Endangered Species Research, Vol 37, Pp 11-24 (2018) |
op_relation |
https://www.int-res.com/abstracts/esr/v37/p11-24/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr00909 https://doaj.org/article/c3fcdf040a874f98b4e24e3a3f29d3e8 |
op_doi |
https://doi.org/10.3354/esr00909 |
container_title |
Endangered Species Research |
container_volume |
37 |
container_start_page |
11 |
op_container_end_page |
24 |
_version_ |
1766008212773928960 |