Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach

It has been suggested that declines in breeding populations of Swainson’s hawks ( Buteo swainsoni ) in California, Oregon, and Nevada may be due to differential mortality of hawks on their wintering grounds. Although massive mortality incidents reported on the wintering grounds partially support thi...

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Detalles Bibliográficos
Autores: Sarasola, José Hernán, Negro, Juan J., Hobson, Keith A., Bortolotti, Gary R., Blidstein, Keith L.
Tipo de recurso: artículo
Fecha de publicación:2008
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/34072
Acceso en línea:http://hdl.handle.net/10261/34072
Access Level:acceso abierto
Palabra clave:Buteo swainsoni
Conservation
Mortality
Neotropical migrants
Stable isotope analysis
Swainson’s hawk
Winter spatial segregation
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spelling Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approachSarasola, José HernánNegro, Juan J.Hobson, Keith A.Bortolotti, Gary R.Blidstein, Keith L.Buteo swainsoniConservationMortalityNeotropical migrantsStable isotope analysisSwainson’s hawkWinter spatial segregationIt has been suggested that declines in breeding populations of Swainson’s hawks ( Buteo swainsoni ) in California, Oregon, and Nevada may be due to differential mortality of hawks on their wintering grounds. Although massive mortality incidents reported on the wintering grounds partially support this suggestion, there are no data showing differential use of wintering areas by breeding populations of Swainson’s hawks. We used stable-hydrogen isotope analysis of feathers to determine whether large flocks of hawks wintering in Argentina consisted of a mixture of individuals from across the North American breeding range or consisted of individuals from discrete breeding populations. We found that flocks of wintering Swainson’s hawks consisted of a mixture of individuals. The lack of connectivity between populations of breeding and wintering hawks suggests that high wintering mortality, either natural or human-induced, is unlikely to have direct consequences on a single breeding area in North America. The demographic effects of winter mortality should be ‘diluted’ across the entire breeding range of Swainson’s hawks.Peer reviewedJohn Wiley & Sons201120112008info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/34072reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésIt has been suggested that declines in breeding populations of Swainson’s hawks ( Buteo swainsoni ) in California, Oregon, and Nevada may be due to differential mortality of hawks on their wintering grounds. Although massive mortality incidents reported on the wintering grounds partially support this suggestion, there are no data showing differential use of wintering areas by breeding populations of Swainson’s hawks. We used stable-hydrogen isotope analysis of feathers to determine whether large flocks of hawks wintering in Argentina consisted of a mixture of individuals from across the North American breeding range or consisted of individuals from discrete breeding populations. We found that flocks of wintering Swainson’s hawks consisted of a mixture of individuals. The lack of connectivity between populations of breeding and wintering hawks suggests that high wintering mortality, either natural or human-induced, is unlikely to have direct consequences on a single breeding area in North America. The demographic effects of winter mortality should be ‘diluted’ across the entire breeding range of Swainson’s hawks.info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/340722026-05-22T06:33:51Z
dc.title.none.fl_str_mv Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
title Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
spellingShingle Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
Sarasola, José Hernán
Buteo swainsoni
Conservation
Mortality
Neotropical migrants
Stable isotope analysis
Swainson’s hawk
Winter spatial segregation
title_short Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
title_full Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
title_fullStr Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
title_full_unstemmed Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
title_sort Can a ‘wintering area effect’ explain population status of Swainson's hawks? A stable isotope approach
dc.creator.none.fl_str_mv Sarasola, José Hernán
Negro, Juan J.
Hobson, Keith A.
Bortolotti, Gary R.
Blidstein, Keith L.
author Sarasola, José Hernán
author_facet Sarasola, José Hernán
Negro, Juan J.
Hobson, Keith A.
Bortolotti, Gary R.
Blidstein, Keith L.
author_role author
author2 Negro, Juan J.
Hobson, Keith A.
Bortolotti, Gary R.
Blidstein, Keith L.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Buteo swainsoni
Conservation
Mortality
Neotropical migrants
Stable isotope analysis
Swainson’s hawk
Winter spatial segregation
topic Buteo swainsoni
Conservation
Mortality
Neotropical migrants
Stable isotope analysis
Swainson’s hawk
Winter spatial segregation
description It has been suggested that declines in breeding populations of Swainson’s hawks ( Buteo swainsoni ) in California, Oregon, and Nevada may be due to differential mortality of hawks on their wintering grounds. Although massive mortality incidents reported on the wintering grounds partially support this suggestion, there are no data showing differential use of wintering areas by breeding populations of Swainson’s hawks. We used stable-hydrogen isotope analysis of feathers to determine whether large flocks of hawks wintering in Argentina consisted of a mixture of individuals from across the North American breeding range or consisted of individuals from discrete breeding populations. We found that flocks of wintering Swainson’s hawks consisted of a mixture of individuals. The lack of connectivity between populations of breeding and wintering hawks suggests that high wintering mortality, either natural or human-induced, is unlikely to have direct consequences on a single breeding area in North America. The demographic effects of winter mortality should be ‘diluted’ across the entire breeding range of Swainson’s hawks.
publishDate 2008
dc.date.none.fl_str_mv 2008
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/34072
url http://hdl.handle.net/10261/34072
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv It has been suggested that declines in breeding populations of Swainson’s hawks ( Buteo swainsoni ) in California, Oregon, and Nevada may be due to differential mortality of hawks on their wintering grounds. Although massive mortality incidents reported on the wintering grounds partially support this suggestion, there are no data showing differential use of wintering areas by breeding populations of Swainson’s hawks. We used stable-hydrogen isotope analysis of feathers to determine whether large flocks of hawks wintering in Argentina consisted of a mixture of individuals from across the North American breeding range or consisted of individuals from discrete breeding populations. We found that flocks of wintering Swainson’s hawks consisted of a mixture of individuals. The lack of connectivity between populations of breeding and wintering hawks suggests that high wintering mortality, either natural or human-induced, is unlikely to have direct consequences on a single breeding area in North America. The demographic effects of winter mortality should be ‘diluted’ across the entire breeding range of Swainson’s hawks.
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv John Wiley & Sons
publisher.none.fl_str_mv John Wiley & Sons
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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