In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula
Female New Zealand sea lions ( Phocarctos hookeri (Gray, 1844)) at the Auckland Islands (remnant populations) are the deepest and longest diving otariids. These remnant populations are found at the margin of the historical range of the species. We hypothesized that diving behaviours of animals in th...
Published in: | Canadian Journal of Zoology |
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2011
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crcansciencepubl:10.1139/z11-098 2024-09-09T19:30:58+00:00 In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula Augé, Amélie A. Chilvers, B. Louise Davis, Lloyd S. Moore, Antoni B. 2011 http://dx.doi.org/10.1139/z11-098 http://www.nrcresearchpress.com/doi/full-xml/10.1139/z11-098 http://www.nrcresearchpress.com/doi/pdf/10.1139/z11-098 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 89, issue 12, page 1195-1205 ISSN 0008-4301 1480-3283 journal-article 2011 crcansciencepubl https://doi.org/10.1139/z11-098 2024-06-20T04:11:54Z Female New Zealand sea lions ( Phocarctos hookeri (Gray, 1844)) at the Auckland Islands (remnant populations) are the deepest and longest diving otariids. These remnant populations are found at the margin of the historical range of the species. We hypothesized that diving behaviours of animals in the core of their historical range is less extreme owing to a better marine habitat. All female New Zealand sea lions (n = 13, aged 2–14 years) born on the Otago Peninsula (initial recolonising population) were equipped with time–depth recorders during April and May 2008, 2009, and 2010. The mean dive depth was 20.2 ± 24.5 m and mean dive duration was 1.8 ± 1.1 min, some of the lowest values reported for otariids. Otago female New Zealand sea lions did not exhibit two distinct diving specialisations as reported at the Auckland Islands. Otago adult females exceeded calculated aerobic dive limits in 7.1% of dives compared with 68.7% at the Auckland Islands. The contrasting differences in diving behaviour between Otago and the Auckland Islands suggest that Otago represents a better marine habitat for New Zealand sea lions, with food easily accessible to animals of all ages. Article in Journal/Newspaper Auckland Islands Canadian Science Publishing New Zealand Canadian Journal of Zoology 89 12 1195 1205 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Female New Zealand sea lions ( Phocarctos hookeri (Gray, 1844)) at the Auckland Islands (remnant populations) are the deepest and longest diving otariids. These remnant populations are found at the margin of the historical range of the species. We hypothesized that diving behaviours of animals in the core of their historical range is less extreme owing to a better marine habitat. All female New Zealand sea lions (n = 13, aged 2–14 years) born on the Otago Peninsula (initial recolonising population) were equipped with time–depth recorders during April and May 2008, 2009, and 2010. The mean dive depth was 20.2 ± 24.5 m and mean dive duration was 1.8 ± 1.1 min, some of the lowest values reported for otariids. Otago female New Zealand sea lions did not exhibit two distinct diving specialisations as reported at the Auckland Islands. Otago adult females exceeded calculated aerobic dive limits in 7.1% of dives compared with 68.7% at the Auckland Islands. The contrasting differences in diving behaviour between Otago and the Auckland Islands suggest that Otago represents a better marine habitat for New Zealand sea lions, with food easily accessible to animals of all ages. |
format |
Article in Journal/Newspaper |
author |
Augé, Amélie A. Chilvers, B. Louise Davis, Lloyd S. Moore, Antoni B. |
spellingShingle |
Augé, Amélie A. Chilvers, B. Louise Davis, Lloyd S. Moore, Antoni B. In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula |
author_facet |
Augé, Amélie A. Chilvers, B. Louise Davis, Lloyd S. Moore, Antoni B. |
author_sort |
Augé, Amélie A. |
title |
In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula |
title_short |
In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula |
title_full |
In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula |
title_fullStr |
In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula |
title_full_unstemmed |
In the shallow end: diving behaviour of recolonising female New Zealand sea lions ( Phocarctos hookeri) around the Otago Peninsula |
title_sort |
in the shallow end: diving behaviour of recolonising female new zealand sea lions ( phocarctos hookeri) around the otago peninsula |
publisher |
Canadian Science Publishing |
publishDate |
2011 |
url |
http://dx.doi.org/10.1139/z11-098 http://www.nrcresearchpress.com/doi/full-xml/10.1139/z11-098 http://www.nrcresearchpress.com/doi/pdf/10.1139/z11-098 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Auckland Islands |
genre_facet |
Auckland Islands |
op_source |
Canadian Journal of Zoology volume 89, issue 12, page 1195-1205 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z11-098 |
container_title |
Canadian Journal of Zoology |
container_volume |
89 |
container_issue |
12 |
container_start_page |
1195 |
op_container_end_page |
1205 |
_version_ |
1809899903210487808 |