Limited sexual segregation in a dimorphic avian scavenger, the Andean condor.
Molted feathers
Movement ecology
Social foraging
Stable isotopes
Vulture
Journal
Oecologia
ISSN: 1432-1939
Titre abrégé: Oecologia
Pays: Germany
ID NLM: 0150372
Informations de publication
Date de publication:
May 2021
May 2021
Historique:
received:
28
09
2020
accepted:
29
03
2021
pubmed:
11
4
2021
medline:
26
5
2021
entrez:
10
4
2021
Statut:
ppublish
Résumé
Sexual segregation is widely reported among sexually dimorphic species and generally attributed to intraspecific competition. Prey diversity and human activities can reinforce niche segregation by increasing resource heterogeneity. Here, we explored trophic and spatial sexual segregation in the only avian scavenger that exhibits pronounced sexual size dimorphism (up to 50% difference in body mass) and a highly despotic social system, the Andean condor (Vultur gryphus). We predicted that larger and dominant males would exclude smaller and subordinate females from high-quality resources, leading to sexual segregation particularly in human-dominated landscapes showing increased prey diversity. We compared resource use between females and males across six sites in Argentina featuring a range of prey diversity via stable isotopes analysis of molted feathers (n = 141 individuals). We then focused on two sites featuring contrasting levels of prey diversity and quantified assimilated diet via stable isotopes and space use via GPS monitoring (n = 23 and 12 tagged individuals). We found no clear differences in isotopic niche space, individual variation in isotopic signature, or assimilated diet between females and males. However, there were differences in foraging locations between sexes, with females apparently using areas of fewer food resources more frequently than males. Local conditions defined the dynamics of fine-scale sexual differences in foraging sites; yet, unpredictable and ephemeral carrion resources likely prevent segregation by sexes at the landscape scale. Our study highlights complex dynamics of sexual segregation in vultures and the relevancy of analyses under multiple spatial-temporal scales to explore segregation in social species.
Identifiants
pubmed: 33837824
doi: 10.1007/s00442-021-04909-8
pii: 10.1007/s00442-021-04909-8
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
77-88Subventions
Organisme : Agencia Nacional de Promoción Científica y Tecnológica
ID : PICT 0725-2014 and 2016-0354 BID
Organisme : Fundación BBVA
ID : BIOCON-08-126
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