Density-dependent productivity in a colonial vulture at two spatial scales

. Understanding how density dependence modifies demographic parameters in long-lived vertebrates is a challenge for ecologists. Two alternative hypotheses have been used to explain the mechanisms behind density-dependent effects on breeding output: habitat heterogeneity and individual adjustment (al...

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Autores: Fernández-Bellon, Darío, Cortés-Avizanda, Ainara, Arenas, Rafael, Donázar, José A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/132285
Acceso en línea:http://hdl.handle.net/10261/132285
Access Level:acceso abierto
Palabra clave:Aegypius monachus
Breeding success
Cinereous vulture
Coloniality
Density dependence
Habitat heterogeneity
Interference competition
Population regulation
Productivity.
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spelling Density-dependent productivity in a colonial vulture at two spatial scalesFernández-Bellon, DaríoCortés-Avizanda, AinaraArenas, RafaelDonázar, José A.Aegypius monachusBreeding successCinereous vultureColonialityDensity dependenceHabitat heterogeneityInterference competitionPopulation regulationProductivity.. Understanding how density dependence modifies demographic parameters in long-lived vertebrates is a challenge for ecologists. Two alternative hypotheses have been used to explain the mechanisms behind density-dependent effects on breeding output: habitat heterogeneity and individual adjustment (also known as interference competition). A number of studies have highlighted the importance of habitat heterogeneity in density dependence in territorial species, but less information exists on demographic processes in colonial species. For these, we expect density-dependent mechanisms to operate at two spatial scales: colony and breeding unit. In this study, we used long-term data from a recovering population of Cinereous Vultures (Aegypius monachus) in southern Spain. We analyzed a long-term data set with information on 2162 breeding attempts at four colonies over a nine-year period (2002–2010) to evaluate environmental and population parameters influencing breeding output. Our results suggest that breeding productivity is subject to density-dependent processes at the colony and the nest site scale and is best explained by interference competition. Factors intrinsic to each colony, as well as environmental constraints linked to physiography and human presence, also play a role in regulatory processes. We detected the existence of a trade-off between the disadvantages of nesting too close to conspecifics and the benefits of coloniality. These could be mediated by the agonistic interactions between breeding pairs and the benefits derived from social sharing of information by breeding individuals. We propose that this trade-off may play a role in defining colony structure and may hold true for other colonial breeding bird species. Our findings also have important management implications for the conservation of this threatened species.Peer reviewedEcological Society of AmericaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201620162016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/132285reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1890/15-0357.1Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1322852026-05-22T06:33:51Z
dc.title.none.fl_str_mv Density-dependent productivity in a colonial vulture at two spatial scales
title Density-dependent productivity in a colonial vulture at two spatial scales
spellingShingle Density-dependent productivity in a colonial vulture at two spatial scales
Fernández-Bellon, Darío
Aegypius monachus
Breeding success
Cinereous vulture
Coloniality
Density dependence
Habitat heterogeneity
Interference competition
Population regulation
Productivity.
title_short Density-dependent productivity in a colonial vulture at two spatial scales
title_full Density-dependent productivity in a colonial vulture at two spatial scales
title_fullStr Density-dependent productivity in a colonial vulture at two spatial scales
title_full_unstemmed Density-dependent productivity in a colonial vulture at two spatial scales
title_sort Density-dependent productivity in a colonial vulture at two spatial scales
dc.creator.none.fl_str_mv Fernández-Bellon, Darío
Cortés-Avizanda, Ainara
Arenas, Rafael
Donázar, José A.
author Fernández-Bellon, Darío
author_facet Fernández-Bellon, Darío
Cortés-Avizanda, Ainara
Arenas, Rafael
Donázar, José A.
author_role author
author2 Cortés-Avizanda, Ainara
Arenas, Rafael
Donázar, José A.
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Aegypius monachus
Breeding success
Cinereous vulture
Coloniality
Density dependence
Habitat heterogeneity

Interference competition

Population regulation

Productivity.
topic Aegypius monachus
Breeding success
Cinereous vulture
Coloniality
Density dependence
Habitat heterogeneity
Interference competition
Population regulation
Productivity.
description . Understanding how density dependence modifies demographic parameters in long-lived vertebrates is a challenge for ecologists. Two alternative hypotheses have been used to explain the mechanisms behind density-dependent effects on breeding output: habitat heterogeneity and individual adjustment (also known as interference competition). A number of studies have highlighted the importance of habitat heterogeneity in density dependence in territorial species, but less information exists on demographic processes in colonial species. For these, we expect density-dependent mechanisms to operate at two spatial scales: colony and breeding unit. In this study, we used long-term data from a recovering population of Cinereous Vultures (Aegypius monachus) in southern Spain. We analyzed a long-term data set with information on 2162 breeding attempts at four colonies over a nine-year period (2002–2010) to evaluate environmental and population parameters influencing breeding output. Our results suggest that breeding productivity is subject to density-dependent processes at the colony and the nest site scale and is best explained by interference competition. Factors intrinsic to each colony, as well as environmental constraints linked to physiography and human presence, also play a role in regulatory processes. We detected the existence of a trade-off between the disadvantages of nesting too close to conspecifics and the benefits of coloniality. These could be mediated by the agonistic interactions between breeding pairs and the benefits derived from social sharing of information by breeding individuals. We propose that this trade-off may play a role in defining colony structure and may hold true for other colonial breeding bird species. Our findings also have important management implications for the conservation of this threatened species.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/132285
url http://hdl.handle.net/10261/132285
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1890/15-0357.1
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Ecological Society of America
publisher.none.fl_str_mv Ecological Society of America
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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