Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance
Abstract The dynamics of leopard seal Hydrurga leptonyx abundance and residency were investigated both within and between years at Bird Island, South Georgia, using observations of tagged and untagged individuals. Seals belonged to an open population, and were sampled outside the breeding season and...
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Online Access: | http://dx.doi.org/10.1017/s0952836904005102 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1017%2FS0952836904005102 https://onlinelibrary.wiley.com/doi/pdf/10.1017/S0952836904005102 https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1017/S0952836904005102 |
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crwiley:10.1017/s0952836904005102 2024-06-02T07:58:00+00:00 Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance Jessopp, M. J. Forcada, J. Reid, K. Trathan, P. N. Murphy, E. J. 2004 http://dx.doi.org/10.1017/s0952836904005102 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1017%2FS0952836904005102 https://onlinelibrary.wiley.com/doi/pdf/10.1017/S0952836904005102 https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1017/S0952836904005102 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 263, issue 3, page 251-258 ISSN 0952-8369 1469-7998 journal-article 2004 crwiley https://doi.org/10.1017/s0952836904005102 2024-05-03T11:46:35Z Abstract The dynamics of leopard seal Hydrurga leptonyx abundance and residency were investigated both within and between years at Bird Island, South Georgia, using observations of tagged and untagged individuals. Seals belonged to an open population, and were sampled outside the breeding season and during their northward winter dispersal (April–October). Seals at Bird Island were highly transient (41–63%) with only a limited number of individuals making repeat visits across years. A minimum yearly survival for resident seals was estimated to be between 0.61 and 0.85. The physical environment played an important role in leopard seal abundance, with observations following an apparent 4‐year periodicity consistent with the frequency and timing of the Antarctic Circumpolar Wave. Years of low sea‐surface temperature (SST) and extensive pack‐ice corresponded to a higher number of seals present, earlier arrivals, and longer periods of residency. Peak leopard seal arrivals at Bird Island corresponded to periods of low SST, which was consistent with the pagophilic nature of this species. Article in Journal/Newspaper Antarc* Antarctic Bird Island Hydrurga leptonyx Leopard Seal Leopard Seals Wiley Online Library Antarctic Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Hydrurga ENVELOPE(-61.626,-61.626,-64.145,-64.145) The Antarctic Journal of Zoology 263 3 251 258 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The dynamics of leopard seal Hydrurga leptonyx abundance and residency were investigated both within and between years at Bird Island, South Georgia, using observations of tagged and untagged individuals. Seals belonged to an open population, and were sampled outside the breeding season and during their northward winter dispersal (April–October). Seals at Bird Island were highly transient (41–63%) with only a limited number of individuals making repeat visits across years. A minimum yearly survival for resident seals was estimated to be between 0.61 and 0.85. The physical environment played an important role in leopard seal abundance, with observations following an apparent 4‐year periodicity consistent with the frequency and timing of the Antarctic Circumpolar Wave. Years of low sea‐surface temperature (SST) and extensive pack‐ice corresponded to a higher number of seals present, earlier arrivals, and longer periods of residency. Peak leopard seal arrivals at Bird Island corresponded to periods of low SST, which was consistent with the pagophilic nature of this species. |
format |
Article in Journal/Newspaper |
author |
Jessopp, M. J. Forcada, J. Reid, K. Trathan, P. N. Murphy, E. J. |
spellingShingle |
Jessopp, M. J. Forcada, J. Reid, K. Trathan, P. N. Murphy, E. J. Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
author_facet |
Jessopp, M. J. Forcada, J. Reid, K. Trathan, P. N. Murphy, E. J. |
author_sort |
Jessopp, M. J. |
title |
Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
title_short |
Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
title_full |
Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
title_fullStr |
Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
title_full_unstemmed |
Winter dispersal of leopard seals ( Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
title_sort |
winter dispersal of leopard seals ( hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1017/s0952836904005102 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1017%2FS0952836904005102 https://onlinelibrary.wiley.com/doi/pdf/10.1017/S0952836904005102 https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1017/S0952836904005102 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(-61.626,-61.626,-64.145,-64.145) |
geographic |
Antarctic Bird Island Hydrurga The Antarctic |
geographic_facet |
Antarctic Bird Island Hydrurga The Antarctic |
genre |
Antarc* Antarctic Bird Island Hydrurga leptonyx Leopard Seal Leopard Seals |
genre_facet |
Antarc* Antarctic Bird Island Hydrurga leptonyx Leopard Seal Leopard Seals |
op_source |
Journal of Zoology volume 263, issue 3, page 251-258 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1017/s0952836904005102 |
container_title |
Journal of Zoology |
container_volume |
263 |
container_issue |
3 |
container_start_page |
251 |
op_container_end_page |
258 |
_version_ |
1800741241077366784 |