Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults
In species exhibiting differential migration by sex and age, understanding what differences exist, and the adaptive reasons for these differences is critical for determining how demographic groups will respond to environmental variability and anthropogenic perturbations. We used satellite-telemetere...
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ftpubmed:oai:pubmedcentral.nih.gov:6763446 2023-05-15T18:49:37+02:00 Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults Zeppelin, Tonya Pelland, Noel Sterling, Jeremy Brost, Brian Melin, Sharon Johnson, Devin Lea, Mary-Anne Ream, Rolf 2019-09-26 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6763446/ http://www.ncbi.nlm.nih.gov/pubmed/31558737 https://doi.org/10.1038/s41598-019-50230-z en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6763446/ http://www.ncbi.nlm.nih.gov/pubmed/31558737 http://dx.doi.org/10.1038/s41598-019-50230-z © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2019 ftpubmed https://doi.org/10.1038/s41598-019-50230-z 2019-10-06T00:39:47Z In species exhibiting differential migration by sex and age, understanding what differences exist, and the adaptive reasons for these differences is critical for determining how demographic groups will respond to environmental variability and anthropogenic perturbations. We used satellite-telemetered movement and diving data to investigate differential migration and its ontogeny in a highly migratory North Pacific Ocean predator, the northern fur seal (Callorhinus ursinus; NFS), with a focus on understudied juvenile (1- to 2-year-old) animals. We instrumented 71 juvenile NFS in two years (2006–07 and 2007–08) at three major North American breeding sites and compared their migratory strategies with pups and adults. Although sexual dimorphism is strong in adult NFS, only weak differences in body mass between sexes were found in juveniles, which had similar body mass to pups (~3–4 months). However, unlike widely-dispersed pups, juvenile male and female NFS dispersed in different directions, and used different habitats characterized by distinct hydrography and prey assemblages during migration, similar to breeding adults. Juvenile diving behavior differed only modestly among habitats and between sexes, consistent with weak differences in body mass. Evidence of habitat sexual segregation by juvenile NFS contradicts previous hypotheses that physiological differences predominantly drive the ontogeny of differential migration. Text Callorhinus ursinus Northern fur seal PubMed Central (PMC) Pacific Scientific Reports 9 1 |
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Article Zeppelin, Tonya Pelland, Noel Sterling, Jeremy Brost, Brian Melin, Sharon Johnson, Devin Lea, Mary-Anne Ream, Rolf Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults |
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In species exhibiting differential migration by sex and age, understanding what differences exist, and the adaptive reasons for these differences is critical for determining how demographic groups will respond to environmental variability and anthropogenic perturbations. We used satellite-telemetered movement and diving data to investigate differential migration and its ontogeny in a highly migratory North Pacific Ocean predator, the northern fur seal (Callorhinus ursinus; NFS), with a focus on understudied juvenile (1- to 2-year-old) animals. We instrumented 71 juvenile NFS in two years (2006–07 and 2007–08) at three major North American breeding sites and compared their migratory strategies with pups and adults. Although sexual dimorphism is strong in adult NFS, only weak differences in body mass between sexes were found in juveniles, which had similar body mass to pups (~3–4 months). However, unlike widely-dispersed pups, juvenile male and female NFS dispersed in different directions, and used different habitats characterized by distinct hydrography and prey assemblages during migration, similar to breeding adults. Juvenile diving behavior differed only modestly among habitats and between sexes, consistent with weak differences in body mass. Evidence of habitat sexual segregation by juvenile NFS contradicts previous hypotheses that physiological differences predominantly drive the ontogeny of differential migration. |
format |
Text |
author |
Zeppelin, Tonya Pelland, Noel Sterling, Jeremy Brost, Brian Melin, Sharon Johnson, Devin Lea, Mary-Anne Ream, Rolf |
author_facet |
Zeppelin, Tonya Pelland, Noel Sterling, Jeremy Brost, Brian Melin, Sharon Johnson, Devin Lea, Mary-Anne Ream, Rolf |
author_sort |
Zeppelin, Tonya |
title |
Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults |
title_short |
Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults |
title_full |
Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults |
title_fullStr |
Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults |
title_full_unstemmed |
Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults |
title_sort |
migratory strategies of juvenile northern fur seals (callorhinus ursinus): bridging the gap between pups and adults |
publisher |
Nature Publishing Group UK |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6763446/ http://www.ncbi.nlm.nih.gov/pubmed/31558737 https://doi.org/10.1038/s41598-019-50230-z |
geographic |
Pacific |
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Pacific |
genre |
Callorhinus ursinus Northern fur seal |
genre_facet |
Callorhinus ursinus Northern fur seal |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6763446/ http://www.ncbi.nlm.nih.gov/pubmed/31558737 http://dx.doi.org/10.1038/s41598-019-50230-z |
op_rights |
© The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-019-50230-z |
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Scientific Reports |
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