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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Geographic and seasonal distribution of the Cock-tailed Tyrant (Alectrurus tricolor) inferred from niche modeling
Auteurs :	Miguel Ângelo Marini, Auteur ; Morgane Barbet-Massin, Auteur ; Leonardo E. Lopes, Auteur ; Frédéric Jiguet, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (154(2) APR 2013)
Article en page(s) :	393-402
Langues:	Anglais
Résumé :	The Cock-tailed Tyrant (Alectrurus tricolor) is a habitat-sensitive and vulnerable bird found in South American grasslands. It is assumed to be migratory but no detailed analysis of distributional records per season has been made. Because of a limited number of field records, we used niche-modeling tools to predict the geographic distribution of the Cock-tailed Tyrant with three objectives: identifying its breeding (summer) and non-breeding (winter) grounds based on climatic suitability, test the hypothesis that it migrates, and test the assumption that it is a niche tracker. The species is apparently not migratory since there was an equivalency of the breeding and winter niches and we found no pattern of latitudinal or altitudinal migration. However, the species seems to be a climatic niche switcher since breeding and winter estimated distributions are not good predictors of the other season's occurrences. We conclude that the Cock-tailed Tyrant is probably resident throughout its range, and that the reported apparent migratory behavior probably reflects partial population migration, seasonal changes in social behavior, or even nomadism. Long-term year-round population studies are warranted.

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