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

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 achiev...

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Autores principales: Ballejo, Fernando, Lambertucci, Sergio A., Trejo, Ana, De Santis, Luciano José María
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Naturales
Patagonia
condor-vulture
competition
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/108967
https://www.cambridge.org/core/journals/bird-conservation-international/article/trophic-niche-overlap-among-scavengers-in-patagonia-supports-the-condorvulture-competition-hypothesis/4E38EC0C0293A5034AB47AFECB623421
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-108967
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Patagonia
condor-vulture
competition
spellingShingle Ciencias Naturales
Patagonia
condor-vulture
competition
Ballejo, Fernando
Lambertucci, Sergio A.
Trejo, Ana
De Santis, Luciano José María
Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
topic_facet Ciencias Naturales
Patagonia
condor-vulture
competition
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 <i>Vultur gryphus</i>, Turkey Vulture <i>Cathartes aura</i> and American Black Vulture <i>Coragyps atratus</i>, 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.
format Articulo
Articulo
author Ballejo, Fernando
Lambertucci, Sergio A.
Trejo, Ana
De Santis, Luciano José María
author_facet Ballejo, Fernando
Lambertucci, Sergio A.
Trejo, Ana
De Santis, Luciano José María
author_sort Ballejo, Fernando
title Trophic niche overlap among scavengers in Patagonia supports the condor-vulture competition hypothesis
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
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/108967
https://www.cambridge.org/core/journals/bird-conservation-international/article/trophic-niche-overlap-among-scavengers-in-patagonia-supports-the-condorvulture-competition-hypothesis/4E38EC0C0293A5034AB47AFECB623421
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