Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic

Many pinniped populations precipitously declined during the 19th and 20th centuries due to overharvesting. In Uruguay, the South American sea lion (SASL) was harvested until 1986. Birth rates in two nearby breeding colonies have had opposite trends for at least 20 yr. We assessed different mechanism...

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Detalles Bibliográficos
Autores: Franco-Trecu, Valentina, Drago, Massimiliano, Baladán, Claudia, Garcia-Olazabal, Mateo D., Crespo, Enrique A., Cardona Pascual, Luis, Inchausti, Pablo
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/226032
Acceso en línea:https://hdl.handle.net/2445/226032
Access Level:acceso abierto
Palabra clave:Pinnípedes
Colònies animals
Pinnipedia
Animal colonies
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spelling Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern AtlanticFranco-Trecu, ValentinaDrago, MassimilianoBaladán, ClaudiaGarcia-Olazabal, Mateo D.Crespo, Enrique A.Cardona Pascual, LuisInchausti, PabloPinnípedesColònies animalsPinnipediaAnimal coloniesMany pinniped populations precipitously declined during the 19th and 20th centuries due to overharvesting. In Uruguay, the South American sea lion (SASL) was harvested until 1986. Birth rates in two nearby breeding colonies have had opposite trends for at least 20 yr. We assessed different mechanisms that could explain opposite trends in birth rates in the two SASL colonies. We compared feeding habits (δ15N and δ13C) of breeding females, birth mass, individual growth rate and early survival of pups and the social structure between colonies. Breeding females from the two colonies did not differ in their feeding habits. However, male and female pups grew faster but had a lower survival in the second month in the smallest colony. We found differences in the social structures, with a higher proportion of males in the smallest colony. The latter is important because peripheral SASL males may abduct and kill pups, which may explain the lower survival of pups in smaller colonies. We believe that the cumulative effects of population extractions have lowered the local SASL population size and disrupted its social structure to the point where Allee-like effects could become important and hamper the recovery of the Uruguayan SASL population.Wiley2026202620152026info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion16 p.application/pdfhttps://hdl.handle.net/2445/226032Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1111/mms.12197Marine Mammal Science, 2015, vol. 31, num.3, p. 963-978https://doi.org/10.1111/mms.12197(c) Society for Marine Mammalogy, 2015info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2260322026-05-29T05:05:01Z
dc.title.none.fl_str_mv Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
title Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
spellingShingle Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
Franco-Trecu, Valentina
Pinnípedes
Colònies animals
Pinnipedia
Animal colonies
title_short Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
title_full Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
title_fullStr Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
title_full_unstemmed Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
title_sort Postharvesting population dynamics of the South American sea lion (Otaria byronia) in the southwestern Atlantic
dc.creator.none.fl_str_mv Franco-Trecu, Valentina
Drago, Massimiliano
Baladán, Claudia
Garcia-Olazabal, Mateo D.
Crespo, Enrique A.
Cardona Pascual, Luis
Inchausti, Pablo
author Franco-Trecu, Valentina
author_facet Franco-Trecu, Valentina
Drago, Massimiliano
Baladán, Claudia
Garcia-Olazabal, Mateo D.
Crespo, Enrique A.
Cardona Pascual, Luis
Inchausti, Pablo
author_role author
author2 Drago, Massimiliano
Baladán, Claudia
Garcia-Olazabal, Mateo D.
Crespo, Enrique A.
Cardona Pascual, Luis
Inchausti, Pablo
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Pinnípedes
Colònies animals
Pinnipedia
Animal colonies
topic Pinnípedes
Colònies animals
Pinnipedia
Animal colonies
description Many pinniped populations precipitously declined during the 19th and 20th centuries due to overharvesting. In Uruguay, the South American sea lion (SASL) was harvested until 1986. Birth rates in two nearby breeding colonies have had opposite trends for at least 20 yr. We assessed different mechanisms that could explain opposite trends in birth rates in the two SASL colonies. We compared feeding habits (δ15N and δ13C) of breeding females, birth mass, individual growth rate and early survival of pups and the social structure between colonies. Breeding females from the two colonies did not differ in their feeding habits. However, male and female pups grew faster but had a lower survival in the second month in the smallest colony. We found differences in the social structures, with a higher proportion of males in the smallest colony. The latter is important because peripheral SASL males may abduct and kill pups, which may explain the lower survival of pups in smaller colonies. We believe that the cumulative effects of population extractions have lowered the local SASL population size and disrupted its social structure to the point where Allee-like effects could become important and hamper the recovery of the Uruguayan SASL population.
publishDate 2015
dc.date.none.fl_str_mv 2015
2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/226032
url https://hdl.handle.net/2445/226032
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1111/mms.12197
Marine Mammal Science, 2015, vol. 31, num.3, p. 963-978
https://doi.org/10.1111/mms.12197
dc.rights.none.fl_str_mv (c) Society for Marine Mammalogy, 2015
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Society for Marine Mammalogy, 2015
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 16 p.
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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