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Strong genetic cohesiveness between Italy and North Africa in four butterfly species

Identifieur interne : 000B98 ( Main/Exploration ); précédent : 000B97; suivant : 000B99

Strong genetic cohesiveness between Italy and North Africa in four butterfly species

Auteurs : Jan Christian Habel [Allemagne, Luxembourg (pays)] ; Dennis Rödder [Allemagne] ; Scalercio Stefano [Italie] ; Marc Meyer [Luxembourg (pays)] ; Thomas Schmitt [Allemagne]

Source :

RBID : ISTEX:FFA328E86DD9D8F1F4C5CA7CEEE77C334C131F44

Descripteurs français

English descriptors

Abstract

The sea acts as an effective dispersal barrier for most terrestrial animal species. Narrow sea straits, therefore, often represent areas where species are able to disperse from one land mass to another. In the Mediterranean Sea, the narrowest connecting points between North Africa and Europe are the Strait of Gibraltar and the Strait of Sicily. In the past, climatic oscillations caused changing sea levels and thus influenced the permeability of these sea straits. We analysed the genetic structure of four butterfly species that all occur on both sides of the Strait of Sicily. In all four species, we observed a lack of genetic differentiation between the populations of North Africa and those of Italy. Species distribution models support the strong cohesiveness in that they show a largely continuous glacial distribution over Italy and North Africa. The data obtained reveal that there was a large exchange of individuals between Italy and the eastern Maghreb during the last ice age. This might not only be the case for the species under investigation in the present study, but also might represent a more general pattern for mobile thermophilic western Palearctic species. © 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 99, 818–830.

Url:
DOI: 10.1111/j.1095-8312.2010.01394.x


Affiliations:


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<div type="abstract">The sea acts as an effective dispersal barrier for most terrestrial animal species. Narrow sea straits, therefore, often represent areas where species are able to disperse from one land mass to another. In the Mediterranean Sea, the narrowest connecting points between North Africa and Europe are the Strait of Gibraltar and the Strait of Sicily. In the past, climatic oscillations caused changing sea levels and thus influenced the permeability of these sea straits. We analysed the genetic structure of four butterfly species that all occur on both sides of the Strait of Sicily. In all four species, we observed a lack of genetic differentiation between the populations of North Africa and those of Italy. Species distribution models support the strong cohesiveness in that they show a largely continuous glacial distribution over Italy and North Africa. The data obtained reveal that there was a large exchange of individuals between Italy and the eastern Maghreb during the last ice age. This might not only be the case for the species under investigation in the present study, but also might represent a more general pattern for mobile thermophilic western Palearctic species. © 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 99, 818–830.</div>
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