Winter dispersal of leopard seals (Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance
The dynamics of leopard seat 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 t...
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Cambridge University Press
2004
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Online Access: | http://nora.nerc.ac.uk/id/eprint/12214/ http://onlinelibrary.wiley.com/doi/10.1017/S0952836904005102/pdf |
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ftnerc:oai:nora.nerc.ac.uk:12214 2023-05-15T13:45:10+02:00 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://nora.nerc.ac.uk/id/eprint/12214/ http://onlinelibrary.wiley.com/doi/10.1017/S0952836904005102/pdf unknown Cambridge University Press Jessopp, M. J.; Forcada, J. orcid:0000-0002-2115-0150 Reid, K.; Trathan, P.N. orcid:0000-0001-6673-9930 Murphy, E.J. orcid:0000-0002-7369-9196 . 2004 Winter dispersal of leopard seals (Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance. Journal of Zoology, 263 (3). 251-258. https://doi.org/10.1017/S0952836904005102 <https://doi.org/10.1017/S0952836904005102> Marine Sciences Zoology Ecology and Environment Publication - Article PeerReviewed 2004 ftnerc https://doi.org/10.1017/S0952836904005102 2023-02-04T19:27:51Z The dynamics of leopard seat 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 Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Hydrurga ENVELOPE(-61.626,-61.626,-64.145,-64.145) Journal of Zoology 263 3 251 258 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Zoology Ecology and Environment |
spellingShingle |
Marine Sciences Zoology Ecology and Environment 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 |
topic_facet |
Marine Sciences Zoology Ecology and Environment |
description |
The dynamics of leopard seat 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. |
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 |
Cambridge University Press |
publishDate |
2004 |
url |
http://nora.nerc.ac.uk/id/eprint/12214/ http://onlinelibrary.wiley.com/doi/10.1017/S0952836904005102/pdf |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(-61.626,-61.626,-64.145,-64.145) |
geographic |
Antarctic The Antarctic Bird Island Hydrurga |
geographic_facet |
Antarctic The Antarctic Bird Island Hydrurga |
genre |
Antarc* Antarctic Bird Island Hydrurga leptonyx Leopard Seal Leopard Seals |
genre_facet |
Antarc* Antarctic Bird Island Hydrurga leptonyx Leopard Seal Leopard Seals |
op_relation |
Jessopp, M. J.; Forcada, J. orcid:0000-0002-2115-0150 Reid, K.; Trathan, P.N. orcid:0000-0001-6673-9930 Murphy, E.J. orcid:0000-0002-7369-9196 . 2004 Winter dispersal of leopard seals (Hydrurga leptonyx): environmental factors influencing demographics and seasonal abundance. Journal of Zoology, 263 (3). 251-258. https://doi.org/10.1017/S0952836904005102 <https://doi.org/10.1017/S0952836904005102> |
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_ |
1766214978645262336 |