To hybridize or not to hybridize: what separates two genetic lineages of the Chalk‐hill Blue Polyommatus coridon (Lycaenidae, Lepidoptera) along their secondary contact zone throughout eastern Central Europe?
Identifieur interne : 000752 ( Main/Exploration ); précédent : 000751; suivant : 000753To hybridize or not to hybridize: what separates two genetic lineages of the Chalk‐hill Blue Polyommatus coridon (Lycaenidae, Lepidoptera) along their secondary contact zone throughout eastern Central Europe?
Auteurs : Thomas Schmitt [Allemagne] ; Marco Zimmermann [Allemagne]Source :
- Journal of Zoological Systematics and Evolutionary Research [ 0947-5745 ] ; 2012-05.
English descriptors
Abstract
As a consequence of postglacial range expansion, hybrid zones evolved where different genetic lineages met. In this study, we analysed the Chalk‐hill Blue Polyommatus coridon all along the contact zone of two expansive lineages. This zone stretches from the sandy areas of north‐eastern Germany, along the mountain ranges of the German–Czech border and throughout the eastern Alps. We studied allozymes (19 loci) of 38 populations (1542 individuals) and compared these data sets against 15 populations of the western and 15 populations of the eastern lineages and found different degrees of hybridization. Thus, the calcareous regions of Thuringia and Sachsen‐Anhalt were mostly colonized by the western lineage. The middle mountain ranges between Bavaria and Bohemia represented a strong barrier blocking further expansion and thus completely impeding hybridization in this region. More intense hybridization was detected in the populations of the eastern Alps, especially in the north‐eastern part, where the Danube most probably acted as an expansion corridor for both lineages followed by intensive hybridization. In the south‐eastern Alps, hybrid populations were mostly detected in the easternmost parts and along the larger river valley of Drava and Mur; pure western populations dominated in the other areas of this region. These results show that the degree of hybridization along a contact zone is correlated with the ecological demands of a species and the regional physical geographic circumstances. This finding was proved for the Chalk‐hill Blue in our study but is also the most likely scenario in most animal and plant species.
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DOI: 10.1111/j.1439-0469.2011.00644.x
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In this study, we analysed the Chalk‐hill Blue Polyommatus coridon all along the contact zone of two expansive lineages. This zone stretches from the sandy areas of north‐eastern Germany, along the mountain ranges of the German–Czech border and throughout the eastern Alps. We studied allozymes (19 loci) of 38 populations (1542 individuals) and compared these data sets against 15 populations of the western and 15 populations of the eastern lineages and found different degrees of hybridization. Thus, the calcareous regions of Thuringia and Sachsen‐Anhalt were mostly colonized by the western lineage. The middle mountain ranges between Bavaria and Bohemia represented a strong barrier blocking further expansion and thus completely impeding hybridization in this region. More intense hybridization was detected in the populations of the eastern Alps, especially in the north‐eastern part, where the Danube most probably acted as an expansion corridor for both lineages followed by intensive hybridization. In the south‐eastern Alps, hybrid populations were mostly detected in the easternmost parts and along the larger river valley of Drava and Mur; pure western populations dominated in the other areas of this region. These results show that the degree of hybridization along a contact zone is correlated with the ecological demands of a species and the regional physical geographic circumstances. This finding was proved for the Chalk‐hill Blue in our study but is also the most likely scenario in most animal and plant species.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Schmitt, Thomas" sort="Schmitt, Thomas" uniqKey="Schmitt T" first="Thomas" last="Schmitt">Thomas Schmitt</name></noRegion><name sortKey="Zimmermann, Marco" sort="Zimmermann, Marco" uniqKey="Zimmermann M" first="Marco" last="Zimmermann">Marco Zimmermann</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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