Article (Scientific journals)
Phylogeographic footprints of the Strait of Gibraltar and Quaternary climatic fluctuations in the western Mediterranean: a case study with the greater white-toothed shrew Crocidura russula (Mammalia: Soricidae)
Cosson, Jean François; Hutterer, Rainer; Libois, Roland et al.
2005In Molecular Ecology, 14, p. 1151-1162
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Keywords :
Europe, Human assisted dispersal, mtDNA, North Africa, phylogeography, Quaternary history, speciation
Abstract :
[en] We used mitochondrial cyt b sequences to investigate the phylogenetic relationships of Crocidura russula (sensu lato) populations across the Strait of Gibraltar, western Europe, Maghreb, and the Mediterranean and Atlantic islands. This revealed very low genetic divergence between European and Moroccan populations. The application of a molecular clock previously calibrated for shrews suggested that the separation of European from Moroccan lineages occurred less than 60000 BP, which is at least 5 million years (Myr) after the reopening of the Strait of Gibraltar. This means that an overwater dispersal event was responsible for the observed phylogeographical structure. In contrast, genetic analyses revealed that Moroccan populations were highly distinct from Tunisian ones. According to the molecular clock, these populations separated about 2.2 million years ago (Ma), a time marked by sharp alternations of dry and humid climates in the Maghreb. The populations of the Mediterranean islands Ibiza, Pantellaria, and Sardinian were founded from Tunisian populations by overwater dispersal. In conclusion, overwater dispersal across the Strait of Gibraltar, probably assisted by humans, is possible for small terrestrial vertebrates. Moreover, as in Europe, Quaternary climatic fluctuations had a major effect on the phylogeographical structure of the Maghreb biota.
Disciplines :
Zoology
Author, co-author :
Cosson, Jean François
Hutterer, Rainer
Libois, Roland ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Zoogéographie - Département des sciences et gestion de l'environnement
Sarà, Maurizio
Taberlet, P.
Vogel, Peter
Language :
English
Title :
Phylogeographic footprints of the Strait of Gibraltar and Quaternary climatic fluctuations in the western Mediterranean: a case study with the greater white-toothed shrew Crocidura russula (Mammalia: Soricidae)
Publication date :
2005
Journal title :
Molecular Ecology
ISSN :
0962-1083
eISSN :
1365-294X
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
14
Pages :
1151-1162
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 December 2010

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