La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Latitudinal clines in sex ratio, bill, and wing length in Least Sandpipers
Auteurs :	S. Nebel, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (77(1) WIN 2006)
Article en page(s) :	39-45
Langues:	Anglais
Résumé :	Differential distribution of nonbreeding Least Sandpipers (Calidris minutilla) according to sex, bill, and wing length was documented using capture data from six locations between California and Ecuador. The distribution of age classes did not vary with latitude. Females, which are slightly larger than males, migrated further south. Wing length increased toward the south for both males and females, which is consistent with the notion that longer wings are adaptive for longer migrations. Bill length also increased in both sexes From north to south. A latitudinal cline in prey burying depth may underlie the clines in bill length as well as in sex ratio.

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