Phylogéographie du Grimpereau des bois

24 02 2015


Grimpereau des bois capturé en Auvergne


Un article vient de paraître dans la revue Biological Journal of the Linnean Society : Pons J.M., Thibault J.C., Fournier J., Olioso G., Rakovic M., Tellini Florenzano G. et Fuchs J. Genetic variation among Corsican and continental populations of the Eurasian treecreeper (Aves: Certhia familiaris) reveals the existence of a palaeoendemic mitochondrial lineage.


In this study we investigate the phylogenetics of the Eurasian treecreeper (Certhia familiaris), a forest passerine with a wide Palaearctic range including the Corsica Island, using 3 mitochondrial genes and 3 nuclear introns, and its phylogeographic history using the COI gene. Our phylogenetics results, including 8 of the 10 subspecies currently recognized, support the monophyly of C. familiaris with respect to its Indo-Asian sister species C. hodgsoni. C. familiaris comprises two lineages that diverged during the mid-Pleistocene (ca 1 Myr): one paleoendemic lineage has an allopatric range nowadays restricted to the Corsica Island and the Caucasus region whereas the second one, more recent and widespread, is distributed over most of Eurasia and in northern China. The most likely scenario that may explain such a pattern is a double colonization of the western Palaearctic from the eastern range of the species. During the middle Pleistocene period, a first lineage expanded its range up into Europe but did not persist through glacial cycles except in Corsica and the Caucasus region. Later, during the upper Pleistocene, a second lineage began to diversify around 0.09 Myr, spreading towards the western Palaearctic from a unique refuge likely located in the eastern Palaearctic. Apart from C. f. corsa, our results suggest that subspecies previously described on morphological grounds in Europe do not correspond to divergent genetic lineages and as such do not possess distinct evolutionary history. Our study highlights the important conservation value of the Corsican treecreeper and emphasizes the major role of mature pine forests in the evolution of endemic bird taxa in Corsica.



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