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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Temporal comparison of the genetic structure in newly founded populations along the expansive range edge of the Melodious Warbler (Hippolais polyglotta) in Southwest Germany. (2013)
Auteurs :	Jan O. Engler, Auteur ; David Roderus, Auteur ; Ortwin Elle, Auteur ; A. Hochkirch, Auteur
Type de document :	Article
Dans :	Vogelwarte (51(3) 2013)
Article en page(s) :	179–184
Langues:	Allemand
Résumé :	Investigating the extrinsic and intrinsic factors that shape species distributions is one of the central goals of biogeography. For expansive range edges in particular, the extrinsic drivers such as climate of biotic interactions are well mentioned in the literature. However, studies investigating range expansion from an intrinsic perspective on an individual basis or on a basis of populations are quite scarce. However, especially this component becomes very important, as the colonization process is a necessary prerequisite for range expansion and takes place on the individual level. Here, we investigated the population genetic structure of three recently founded populations of the Melodious Warbler (Hippolais polyglotta) along its expansive range edge in southwestern Germany. The populations were founded between the early 1980s and the late 1990s, thus having a different age. We genotyped each of the three populations in 2001 and again in 2008 at six microsatellites. We found a generally homogeneous genetic diversity between the populations. The genetic differentiation between the populations was low but present in 2001 but completely absent in 2008. Consequently, single populations differ in their genetic setup between the seven years. As a highly mobile species, the Melodious warbler might be able to rapidly exchange between populations, even covering longer distances. We conclude that long distance dispersal might play a central role in the foundation of new populations in the cause of range expansion in this species. Once a population has been successfully established regional gene-flow but also ongoing long distance dispersal might homogenize the genetic setup rather quickly within just a few generations. This consequently enables this species to keep track of changes in its range (e.g. as a consequence of climatic changes) without losing its genetic setup.

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