Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain

We examined changes in diet composition during the breeding period for the endangered Lesser Kestrel (Falco naumanni). Pellets were collected weekly from the last week of March until the first week of July in a colony located in southwestern Spain. Diet composition was evaluated in terms of frequenc...

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Detalles Bibliográficos
Autores: Rodríguez, Carlos, Tapia, Luis, Kieny, Florian, Bustamante, Javier
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/46664
Acceso en línea:http://hdl.handle.net/10261/46664
Access Level:acceso abierto
Palabra clave:Lesser Kestrel
Falco naumanni
Diet
pellet analysis
phenology
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spelling Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern SpainRodríguez, CarlosTapia, LuisKieny, FlorianBustamante, JavierLesser KestrelFalco naumanniDietpellet analysisphenologyWe examined changes in diet composition during the breeding period for the endangered Lesser Kestrel (Falco naumanni). Pellets were collected weekly from the last week of March until the first week of July in a colony located in southwestern Spain. Diet composition was evaluated in terms of frequency of occurrence of different prey, mean prey weight, and prey richness of each pellet. Generalized additive models were used to analyze the predictive ability of calendar week (as an index to prey availabil- ity), reproductive week (as an index to breeding demands), and nest identity (as a proxy for individual preferences/abilities) on the above dietary metrics. Primary prey species were the mole cricket (Gryllotalpa gryllotalpa) during courtship, the saddle-backed bush cricket (Ephippiger ephippiger) during incubation, and the migratory locust (Locusta migratoria) and the white-faced bush-cricket (Decticus albifrons) during the nestling phase. Small mammals were only important during some particular weeks at the beginning of the nestling period. Mean prey weight increased as the breeding season advanced, while species richness tended to decline. This was mainly due to the decreasing contribution of small prey items such as beetles to the diet and the greater incidence of large prey species. Calendar week and reproductive week had similar abilities to predict diet composition, and were better predictors than nest identity. Models fitted to particular prey species had greater explanatory power than models fitted to prey groups. Likewise, models fitted to those prey species that we considered ‘‘preferred’’ fitted better than those considered ‘‘refuge’’ prey.Peer reviewedRaptor Research Foundation201220122010info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/46664reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.bioone.org/doi/pdf/10.3356/JRR-09-34.1info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/466642026-05-22T06:33:51Z
dc.title.none.fl_str_mv Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
title Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
spellingShingle Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
Rodríguez, Carlos
Lesser Kestrel
Falco naumanni
Diet
pellet analysis
phenology
title_short Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
title_full Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
title_fullStr Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
title_full_unstemmed Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
title_sort Temporal Changes in Lesser Kestrel (Falco naumanni) Diet During the Breeding Season in Southern Spain
dc.creator.none.fl_str_mv Rodríguez, Carlos
Tapia, Luis
Kieny, Florian
Bustamante, Javier
author Rodríguez, Carlos
author_facet Rodríguez, Carlos
Tapia, Luis
Kieny, Florian
Bustamante, Javier
author_role author
author2 Tapia, Luis
Kieny, Florian
Bustamante, Javier
author2_role author
author
author
dc.subject.none.fl_str_mv Lesser Kestrel
Falco naumanni
Diet
pellet analysis
phenology
topic Lesser Kestrel
Falco naumanni
Diet
pellet analysis
phenology
description We examined changes in diet composition during the breeding period for the endangered Lesser Kestrel (Falco naumanni). Pellets were collected weekly from the last week of March until the first week of July in a colony located in southwestern Spain. Diet composition was evaluated in terms of frequency of occurrence of different prey, mean prey weight, and prey richness of each pellet. Generalized additive models were used to analyze the predictive ability of calendar week (as an index to prey availabil- ity), reproductive week (as an index to breeding demands), and nest identity (as a proxy for individual preferences/abilities) on the above dietary metrics. Primary prey species were the mole cricket (Gryllotalpa gryllotalpa) during courtship, the saddle-backed bush cricket (Ephippiger ephippiger) during incubation, and the migratory locust (Locusta migratoria) and the white-faced bush-cricket (Decticus albifrons) during the nestling phase. Small mammals were only important during some particular weeks at the beginning of the nestling period. Mean prey weight increased as the breeding season advanced, while species richness tended to decline. This was mainly due to the decreasing contribution of small prey items such as beetles to the diet and the greater incidence of large prey species. Calendar week and reproductive week had similar abilities to predict diet composition, and were better predictors than nest identity. Models fitted to particular prey species had greater explanatory power than models fitted to prey groups. Likewise, models fitted to those prey species that we considered ‘‘preferred’’ fitted better than those considered ‘‘refuge’’ prey.
publishDate 2010
dc.date.none.fl_str_mv 2010
2012
2012
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/10261/46664
url http://hdl.handle.net/10261/46664
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.bioone.org/doi/pdf/10.3356/JRR-09-34.1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Raptor Research Foundation
publisher.none.fl_str_mv Raptor Research Foundation
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 15.81155

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