Social composition and spatial distribution of colonies in an expanding population of South American sea lions

Autores
Grandi, Maria Florencia; Dans, Silvana Laura; Crespo, Enrique Alberto
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In northern Patagonia, South American sea lions (Otaria flavescens) are increasing in number after a depletive harvest. There has been an expansion of colonies with an increase in numbers of pups, and changes in social composition and spatial distribution. Using annual counts of 4 different age classes from 1972 to 2007, we found that new colonies change their social composition, transforming from haul-out sites to breeding sites while passing through mixed structures. From this pattern, we hypothesize that at dense breeding sites the shortage of space or the avoidance of intraspecific harassment promotes dispersal by 1st-time breeders to suitable sites nearby. Such mechanisms, along with philopatry and site fidelity, will promote the establishment of new breeding colonies nearer to existing breeding colonies than would be expected by chance. There was significant spatial clustering of new breeding colonies around the 7 focal (established) colonies. This spatial pattern was consistent through time. New breeding colonies were closer to focal colonies than are nonbreeding ones, suggesting a "spill-over" effect, where young individuals choose to breed near established breeders. The colonization mechanism we found suggests that potential areas for population expansion could be closer to areas where growing colonies already exist and highlights the importance of the juvenile age classes and the areas adjacent to colonies in the overall recovery of any population of pinnipeds.
Fil: Grandi, Maria Florencia. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Dans, Silvana Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Crespo, Enrique Alberto. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Materia
COLONY CLUSTERING
NORTHERN PATAGONIA
OTARIA FLAVESCENS
RECOLONIZATION
SOCIAL COMPOSITION
SOUTH AMERICAN SEA LION
SPATIAL DISTRIBUTION
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/97044
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Social composition and spatial distribution of colonies in an expanding population of South American sea lionsGrandi, Maria FlorenciaDans, Silvana LauraCrespo, Enrique AlbertoCOLONY CLUSTERINGNORTHERN PATAGONIAOTARIA FLAVESCENSRECOLONIZATIONSOCIAL COMPOSITIONSOUTH AMERICAN SEA LIONSPATIAL DISTRIBUTIONhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1In northern Patagonia, South American sea lions (Otaria flavescens) are increasing in number after a depletive harvest. There has been an expansion of colonies with an increase in numbers of pups, and changes in social composition and spatial distribution. Using annual counts of 4 different age classes from 1972 to 2007, we found that new colonies change their social composition, transforming from haul-out sites to breeding sites while passing through mixed structures. From this pattern, we hypothesize that at dense breeding sites the shortage of space or the avoidance of intraspecific harassment promotes dispersal by 1st-time breeders to suitable sites nearby. Such mechanisms, along with philopatry and site fidelity, will promote the establishment of new breeding colonies nearer to existing breeding colonies than would be expected by chance. There was significant spatial clustering of new breeding colonies around the 7 focal (established) colonies. This spatial pattern was consistent through time. New breeding colonies were closer to focal colonies than are nonbreeding ones, suggesting a "spill-over" effect, where young individuals choose to breed near established breeders. The colonization mechanism we found suggests that potential areas for population expansion could be closer to areas where growing colonies already exist and highlights the importance of the juvenile age classes and the areas adjacent to colonies in the overall recovery of any population of pinnipeds.Fil: Grandi, Maria Florencia. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Dans, Silvana Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Crespo, Enrique Alberto. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaOxford University Press2008-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/97044Grandi, Maria Florencia; Dans, Silvana Laura; Crespo, Enrique Alberto; Social composition and spatial distribution of colonies in an expanding population of South American sea lions; Oxford University Press; Journal of Mammalogy; 89; 5; 10-2008; 1218-12280022-23721545-1542CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/jmammal/article/89/5/1218/1032147info:eu-repo/semantics/altIdentifier/doi/10.1644/08-MAMM-A-088.1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:39:45Zoai:ri.conicet.gov.ar:11336/97044instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-17 11:39:45.765CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Social composition and spatial distribution of colonies in an expanding population of South American sea lions
title Social composition and spatial distribution of colonies in an expanding population of South American sea lions
spellingShingle Social composition and spatial distribution of colonies in an expanding population of South American sea lions
Grandi, Maria Florencia
COLONY CLUSTERING
NORTHERN PATAGONIA
OTARIA FLAVESCENS
RECOLONIZATION
SOCIAL COMPOSITION
SOUTH AMERICAN SEA LION
SPATIAL DISTRIBUTION
title_short Social composition and spatial distribution of colonies in an expanding population of South American sea lions
title_full Social composition and spatial distribution of colonies in an expanding population of South American sea lions
title_fullStr Social composition and spatial distribution of colonies in an expanding population of South American sea lions
title_full_unstemmed Social composition and spatial distribution of colonies in an expanding population of South American sea lions
title_sort Social composition and spatial distribution of colonies in an expanding population of South American sea lions
dc.creator.none.fl_str_mv Grandi, Maria Florencia
Dans, Silvana Laura
Crespo, Enrique Alberto
author Grandi, Maria Florencia
author_facet Grandi, Maria Florencia
Dans, Silvana Laura
Crespo, Enrique Alberto
author_role author
author2 Dans, Silvana Laura
Crespo, Enrique Alberto
author2_role author
author
dc.subject.none.fl_str_mv COLONY CLUSTERING
NORTHERN PATAGONIA
OTARIA FLAVESCENS
RECOLONIZATION
SOCIAL COMPOSITION
SOUTH AMERICAN SEA LION
SPATIAL DISTRIBUTION
topic COLONY CLUSTERING
NORTHERN PATAGONIA
OTARIA FLAVESCENS
RECOLONIZATION
SOCIAL COMPOSITION
SOUTH AMERICAN SEA LION
SPATIAL DISTRIBUTION
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In northern Patagonia, South American sea lions (Otaria flavescens) are increasing in number after a depletive harvest. There has been an expansion of colonies with an increase in numbers of pups, and changes in social composition and spatial distribution. Using annual counts of 4 different age classes from 1972 to 2007, we found that new colonies change their social composition, transforming from haul-out sites to breeding sites while passing through mixed structures. From this pattern, we hypothesize that at dense breeding sites the shortage of space or the avoidance of intraspecific harassment promotes dispersal by 1st-time breeders to suitable sites nearby. Such mechanisms, along with philopatry and site fidelity, will promote the establishment of new breeding colonies nearer to existing breeding colonies than would be expected by chance. There was significant spatial clustering of new breeding colonies around the 7 focal (established) colonies. This spatial pattern was consistent through time. New breeding colonies were closer to focal colonies than are nonbreeding ones, suggesting a "spill-over" effect, where young individuals choose to breed near established breeders. The colonization mechanism we found suggests that potential areas for population expansion could be closer to areas where growing colonies already exist and highlights the importance of the juvenile age classes and the areas adjacent to colonies in the overall recovery of any population of pinnipeds.
Fil: Grandi, Maria Florencia. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Dans, Silvana Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Crespo, Enrique Alberto. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
description In northern Patagonia, South American sea lions (Otaria flavescens) are increasing in number after a depletive harvest. There has been an expansion of colonies with an increase in numbers of pups, and changes in social composition and spatial distribution. Using annual counts of 4 different age classes from 1972 to 2007, we found that new colonies change their social composition, transforming from haul-out sites to breeding sites while passing through mixed structures. From this pattern, we hypothesize that at dense breeding sites the shortage of space or the avoidance of intraspecific harassment promotes dispersal by 1st-time breeders to suitable sites nearby. Such mechanisms, along with philopatry and site fidelity, will promote the establishment of new breeding colonies nearer to existing breeding colonies than would be expected by chance. There was significant spatial clustering of new breeding colonies around the 7 focal (established) colonies. This spatial pattern was consistent through time. New breeding colonies were closer to focal colonies than are nonbreeding ones, suggesting a "spill-over" effect, where young individuals choose to breed near established breeders. The colonization mechanism we found suggests that potential areas for population expansion could be closer to areas where growing colonies already exist and highlights the importance of the juvenile age classes and the areas adjacent to colonies in the overall recovery of any population of pinnipeds.
publishDate 2008
dc.date.none.fl_str_mv 2008-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/97044
Grandi, Maria Florencia; Dans, Silvana Laura; Crespo, Enrique Alberto; Social composition and spatial distribution of colonies in an expanding population of South American sea lions; Oxford University Press; Journal of Mammalogy; 89; 5; 10-2008; 1218-1228
0022-2372
1545-1542
CONICET Digital
CONICET
url http://hdl.handle.net/11336/97044
identifier_str_mv Grandi, Maria Florencia; Dans, Silvana Laura; Crespo, Enrique Alberto; Social composition and spatial distribution of colonies in an expanding population of South American sea lions; Oxford University Press; Journal of Mammalogy; 89; 5; 10-2008; 1218-1228
0022-2372
1545-1542
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/jmammal/article/89/5/1218/1032147
info:eu-repo/semantics/altIdentifier/doi/10.1644/08-MAMM-A-088.1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.000565

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