Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis

Autores
Ballejo, Fernando; Lambertucci, Sergio Agustin; Trejo, Ana Raquel; De Santis, Luciano J. M.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Animals that share resources tend to use different foraging strategies in order to decrease potential competition. Scavenging birds using the same nutritional resources can segregate into different space and time scales. However, it has been suggested that when the species do not co-evolve to achieve such segregation competition may result. Our aim was to study the trophic niche overlap between three species of obligate scavengers, the Andean Condor Vultur gryphus, Turkey Vulture Cathartes aura and American Black Vulture Coragyps atratus, which are the main avian consumers of carcasses in north-western Patagonia. Black Vultures arrived in the area relatively recently, have expanded their distribution following human activities, and have been suggested to compete with the threatened condor. We collected pellets in communal roosts of the three species to determine their diet, and to estimate the diversity (Shannon Index) and diet similarity (Pianka overlap index). We found that the Turkey Vulture has greater niche breadth and, apart from domestic livestock, it incorporates smaller items such as fish, reptiles and a great number of birds, carnivores and mice. Although the Black Vulture diet includes arthropods, they feed primarily on introduced ungulates, overlapping more with condor diet when roosting far from urban centres. As these latter two species share the same food resource, human activities that positively affect the abundance of the Black Vulture could increase competition among them, with possible implications for the conservation of the Andean Condor.
Fil: Ballejo, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Lambertucci, Sergio Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Trejo, Ana Raquel. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina
Fil: De Santis, Luciano J. M.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
Materia
Scavengers
Diet
Niche Overlap
Patagonia
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:11336/64391
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/64391
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesisBallejo, FernandoLambertucci, Sergio AgustinTrejo, Ana RaquelDe Santis, Luciano J. M.ScavengersDietNiche OverlapPatagoniahttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Animals that share resources tend to use different foraging strategies in order to decrease potential competition. Scavenging birds using the same nutritional resources can segregate into different space and time scales. However, it has been suggested that when the species do not co-evolve to achieve such segregation competition may result. Our aim was to study the trophic niche overlap between three species of obligate scavengers, the Andean Condor Vultur gryphus, Turkey Vulture Cathartes aura and American Black Vulture Coragyps atratus, which are the main avian consumers of carcasses in north-western Patagonia. Black Vultures arrived in the area relatively recently, have expanded their distribution following human activities, and have been suggested to compete with the threatened condor. We collected pellets in communal roosts of the three species to determine their diet, and to estimate the diversity (Shannon Index) and diet similarity (Pianka overlap index). We found that the Turkey Vulture has greater niche breadth and, apart from domestic livestock, it incorporates smaller items such as fish, reptiles and a great number of birds, carnivores and mice. Although the Black Vulture diet includes arthropods, they feed primarily on introduced ungulates, overlapping more with condor diet when roosting far from urban centres. As these latter two species share the same food resource, human activities that positively affect the abundance of the Black Vulture could increase competition among them, with possible implications for the conservation of the Andean Condor.Fil: Ballejo, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Lambertucci, Sergio Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Trejo, Ana Raquel. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; ArgentinaFil: De Santis, Luciano J. M.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; ArgentinaCambridge University Press2017-11-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/64391Ballejo, Fernando; Lambertucci, Sergio Agustin; Trejo, Ana Raquel; De Santis, Luciano J. M.; Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis; Cambridge University Press; Bird Conservation International; 28; 3; 16-11-2017; 390-4020959-2709CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/product/identifier/S0959270917000211/type/journal_articleinfo:eu-repo/semantics/altIdentifier/doi/10.1017/S0959270917000211info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:50Zoai:ri.conicet.gov.ar:11336/64391instacron: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:34982025-09-03 09:47:51.159CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
title Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
spellingShingle Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
Ballejo, Fernando
Scavengers
Diet
Niche Overlap
Patagonia
title_short Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
title_full Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
title_fullStr Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
title_full_unstemmed Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
title_sort Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
dc.creator.none.fl_str_mv Ballejo, Fernando
Lambertucci, Sergio Agustin
Trejo, Ana Raquel
De Santis, Luciano J. M.
author Ballejo, Fernando
author_facet Ballejo, Fernando
Lambertucci, Sergio Agustin
Trejo, Ana Raquel
De Santis, Luciano J. M.
author_role author
author2 Lambertucci, Sergio Agustin
Trejo, Ana Raquel
De Santis, Luciano J. M.
author2_role author
author
author
dc.subject.none.fl_str_mv Scavengers
Diet
Niche Overlap
Patagonia
topic Scavengers
Diet
Niche Overlap
Patagonia
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Animals that share resources tend to use different foraging strategies in order to decrease potential competition. Scavenging birds using the same nutritional resources can segregate into different space and time scales. However, it has been suggested that when the species do not co-evolve to achieve such segregation competition may result. Our aim was to study the trophic niche overlap between three species of obligate scavengers, the Andean Condor Vultur gryphus, Turkey Vulture Cathartes aura and American Black Vulture Coragyps atratus, which are the main avian consumers of carcasses in north-western Patagonia. Black Vultures arrived in the area relatively recently, have expanded their distribution following human activities, and have been suggested to compete with the threatened condor. We collected pellets in communal roosts of the three species to determine their diet, and to estimate the diversity (Shannon Index) and diet similarity (Pianka overlap index). We found that the Turkey Vulture has greater niche breadth and, apart from domestic livestock, it incorporates smaller items such as fish, reptiles and a great number of birds, carnivores and mice. Although the Black Vulture diet includes arthropods, they feed primarily on introduced ungulates, overlapping more with condor diet when roosting far from urban centres. As these latter two species share the same food resource, human activities that positively affect the abundance of the Black Vulture could increase competition among them, with possible implications for the conservation of the Andean Condor.
Fil: Ballejo, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Lambertucci, Sergio Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Trejo, Ana Raquel. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina
Fil: De Santis, Luciano J. M.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
description Animals that share resources tend to use different foraging strategies in order to decrease potential competition. Scavenging birds using the same nutritional resources can segregate into different space and time scales. However, it has been suggested that when the species do not co-evolve to achieve such segregation competition may result. Our aim was to study the trophic niche overlap between three species of obligate scavengers, the Andean Condor Vultur gryphus, Turkey Vulture Cathartes aura and American Black Vulture Coragyps atratus, which are the main avian consumers of carcasses in north-western Patagonia. Black Vultures arrived in the area relatively recently, have expanded their distribution following human activities, and have been suggested to compete with the threatened condor. We collected pellets in communal roosts of the three species to determine their diet, and to estimate the diversity (Shannon Index) and diet similarity (Pianka overlap index). We found that the Turkey Vulture has greater niche breadth and, apart from domestic livestock, it incorporates smaller items such as fish, reptiles and a great number of birds, carnivores and mice. Although the Black Vulture diet includes arthropods, they feed primarily on introduced ungulates, overlapping more with condor diet when roosting far from urban centres. As these latter two species share the same food resource, human activities that positively affect the abundance of the Black Vulture could increase competition among them, with possible implications for the conservation of the Andean Condor.
publishDate 2017
dc.date.none.fl_str_mv 2017-11-16
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/11336/64391
Ballejo, Fernando; Lambertucci, Sergio Agustin; Trejo, Ana Raquel; De Santis, Luciano J. M.; Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis; Cambridge University Press; Bird Conservation International; 28; 3; 16-11-2017; 390-402
0959-2709
CONICET Digital
CONICET
url http://hdl.handle.net/11336/64391
identifier_str_mv Ballejo, Fernando; Lambertucci, Sergio Agustin; Trejo, Ana Raquel; De Santis, Luciano J. M.; Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis; Cambridge University Press; Bird Conservation International; 28; 3; 16-11-2017; 390-402
0959-2709
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://www.cambridge.org/core/product/identifier/S0959270917000211/type/journal_article
info:eu-repo/semantics/altIdentifier/doi/10.1017/S0959270917000211
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
dc.publisher.none.fl_str_mv Cambridge University Press
publisher.none.fl_str_mv Cambridge 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 13.13397

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