Migratory strategies of juvenile northern fur seals (Callorhinus ursinus): bridging the gap between pups and adults
Abstract 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-t...
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Online Access: | http://dx.doi.org/10.1038/s41598-019-50230-z http://www.nature.com/articles/s41598-019-50230-z.pdf http://www.nature.com/articles/s41598-019-50230-z |
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crspringernat:10.1038/s41598-019-50230-z 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 http://dx.doi.org/10.1038/s41598-019-50230-z http://www.nature.com/articles/s41598-019-50230-z.pdf http://www.nature.com/articles/s41598-019-50230-z en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Scientific Reports volume 9, issue 1 ISSN 2045-2322 Multidisciplinary journal-article 2019 crspringernat https://doi.org/10.1038/s41598-019-50230-z 2022-01-04T16:54:22Z Abstract 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. Article in Journal/Newspaper Callorhinus ursinus Northern fur seal Springer Nature (via Crossref) Pacific Scientific Reports 9 1 |
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Springer Nature (via Crossref) |
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English |
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Multidisciplinary 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 |
topic_facet |
Multidisciplinary |
description |
Abstract 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 |
Article in Journal/Newspaper |
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 |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
http://dx.doi.org/10.1038/s41598-019-50230-z http://www.nature.com/articles/s41598-019-50230-z.pdf http://www.nature.com/articles/s41598-019-50230-z |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Callorhinus ursinus Northern fur seal |
genre_facet |
Callorhinus ursinus Northern fur seal |
op_source |
Scientific Reports volume 9, issue 1 ISSN 2045-2322 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-019-50230-z |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
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1766243230319378432 |