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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Multilocus phylogeography of Australian teals (Anas spp.): a case study of the relationship between vagility and genetic structure
Auteurs :	Kirandeep K. Dhami, Auteur ; Leo Joseph, Auteur ; David A. Roshier, Auteur ; Robert Heinsohn, Auteur ; Jeffrey L. Peters, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (44(2) MAR 2013)
Article en page(s) :	169-178
Langues:	Anglais
Résumé :	Biogeographic barriers potentially restrict gene flow but variation in dispersal or vagility can influence the effectiveness of these barriers among different species and produce characteristic patterns of population genetic structure. The objective of this study was to investigate interspecific and intraspecific genetic structure in two closely related species that differ in several life-history characteristics. The grey teal Anas gracilis is geographically widespread throughout Australia with a distribution that crosses several recognized biogeographic barriers. This species has high vagility as its extensive movements track broad-scale patterns in rainfall. In contrast, the closely related chestnut teal A. castanea is endemic to the mesic southeastern and southwestern regions of Australia and is more sedentary. We hypothesized that these differences in life-history characteristics would result in more pronounced population structuring in the chestnut teal. We sequenced five nuclear loci (nuDNA) for 49 grey teal and 23 chestnut teal and compared results to published mitochondrial DNA (mtDNA) sequences. We used analysis of molecular variance to examine population structure, and applied coalescent based approaches to estimate demographic parameters. As predicted, chestnut teal were more strongly structured at both mtDNA and nuDNA (phi ST= 0.163 and 0.054, respectively) than were grey teal (phi ST

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