Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina
Abstract Southern elephant seals breed at Península Valdés (PV, Argentina) along 200 km of coastline. Annual pup counts at peak breeding season for the entire colony increased from 12,113 in 1995 to 14,350 in 2006. Two demographic subunits were identified in the North and South of PV with different...
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Language: | English |
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crwiley:10.1111/j.1748-7692.2008.00268.x 2024-06-23T07:52:28+00:00 Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina Ferrari, Mariano A. Lewis, Mirtha N. Pascual, Miguel A. Campagna, Claudio 2009 http://dx.doi.org/10.1111/j.1748-7692.2008.00268.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2008.00268.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2008.00268.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 25, issue 3, page 681-692 ISSN 0824-0469 1748-7692 journal-article 2009 crwiley https://doi.org/10.1111/j.1748-7692.2008.00268.x 2024-06-06T04:19:42Z Abstract Southern elephant seals breed at Península Valdés (PV, Argentina) along 200 km of coastline. Annual pup counts at peak breeding season for the entire colony increased from 12,113 in 1995 to 14,350 in 2006. Two demographic subunits were identified in the North and South of PV with different trends in births numbers, sex ratios and harem sizes. Birth numbers increased in the South, but decreased sharply in the North. To explain the trends in the colony and subunits, a population model was proposed that integrates social structure (harem size and sex ratio) in a fertility function that quantifies the effects of the social structure on the number of births. We found that a better fit to census data results from our model compared to a linear one (χ 1 2 = 4.027, P = 0.045) . The model was then used to test alternative hypotheses about the role of recruitment and migration on the dynamic of the two subunits. Results indicated the relevance of considering social structure in population models of gregarious and polygynous species, and is an additional tool for comparative studies between populations of elephant seals where long term census are available. Article in Journal/Newspaper Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals Wiley Online Library Argentina Marine Mammal Science 25 3 681 692 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Southern elephant seals breed at Península Valdés (PV, Argentina) along 200 km of coastline. Annual pup counts at peak breeding season for the entire colony increased from 12,113 in 1995 to 14,350 in 2006. Two demographic subunits were identified in the North and South of PV with different trends in births numbers, sex ratios and harem sizes. Birth numbers increased in the South, but decreased sharply in the North. To explain the trends in the colony and subunits, a population model was proposed that integrates social structure (harem size and sex ratio) in a fertility function that quantifies the effects of the social structure on the number of births. We found that a better fit to census data results from our model compared to a linear one (χ 1 2 = 4.027, P = 0.045) . The model was then used to test alternative hypotheses about the role of recruitment and migration on the dynamic of the two subunits. Results indicated the relevance of considering social structure in population models of gregarious and polygynous species, and is an additional tool for comparative studies between populations of elephant seals where long term census are available. |
format |
Article in Journal/Newspaper |
author |
Ferrari, Mariano A. Lewis, Mirtha N. Pascual, Miguel A. Campagna, Claudio |
spellingShingle |
Ferrari, Mariano A. Lewis, Mirtha N. Pascual, Miguel A. Campagna, Claudio Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina |
author_facet |
Ferrari, Mariano A. Lewis, Mirtha N. Pascual, Miguel A. Campagna, Claudio |
author_sort |
Ferrari, Mariano A. |
title |
Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina |
title_short |
Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina |
title_full |
Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina |
title_fullStr |
Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina |
title_full_unstemmed |
Interdependence of social structure and demography in the southern elephant seal colony of Península Valdés, Argentina |
title_sort |
interdependence of social structure and demography in the southern elephant seal colony of península valdés, argentina |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2008.00268.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2008.00268.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2008.00268.x |
geographic |
Argentina |
geographic_facet |
Argentina |
genre |
Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals |
op_source |
Marine Mammal Science volume 25, issue 3, page 681-692 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2008.00268.x |
container_title |
Marine Mammal Science |
container_volume |
25 |
container_issue |
3 |
container_start_page |
681 |
op_container_end_page |
692 |
_version_ |
1802643778276687872 |