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Massana, M., Montgelard, C., Zenboudji, S., Arnal, V., Cheylan, M., Bertolero, A., & Pretus, J. L. , Genetic structure of the hermann’s tortoise (testudo hermanni) on the island of menorca. Unpublished paper presented at Atelier international sur la gestion et la restauration des populations et habitats de la Tortue d’Hermann / International workshop on the management and restoration of Hermann’s tortoise populations and habitats. 
Added by: Admin (06 Jan 2014 18:24:58 UTC)
Resource type: Conference Paper
BibTeX citation key: Massana2013
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Categories: General
Keywords: Genetik - genetics, Habitat - habitat, Schildkröten - turtles + tortoises, Südwesteuropa - South-Western Europa, Testudinidae, Testudo hermanni
Creators: Arnal, Bertolero, Cheylan, Massana, Montgelard, Pretus, Zenboudji
Collection: Atelier international sur la gestion et la restauration des populations et habitats de la Tortue d’Hermann / International workshop on the management and restoration of Hermann’s tortoise populations and habitats
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Abstract     
Testudo hermanni Testudinidae We present the first approach to the genetic diversity and structure of the Hermann’s tortoise (Testudo hermanni hermanni Gmelin, 1789) for the island of Menorca. In Menorca, it was introduced by the first inhabitants perhaps 2 000 to 3 000 years ago. Currently, it’s distributed almost all over the island and occupies a wide range of habitats, including coastal dunes, open forests of evergreen holm oaks or pine trees and abandoned fields. 146 individuals from 67 localities all over the island were analyzed for nineteen microsatellites loci specifically isolated from Testudo hermanni. We used georeferenced individual multilocus genotypes and a model-based clustering method for the inference of the number of populations and of the spatial location of genetic discontinuities between those populations. Results show a very clear pattern of two segregated populations. We revealed a NW – SE differentiation that cannot be easily explained by a geographical barrier. The highly significant population differentiation is proposed to be the modern result of still unmixed two different historical introductions. Previous analyses with mtDNA support this hypothesis. Actually, two different haplotipes coexist in the island, one that appears to be naturally confined to the Iberian Peninsula and a second one that is found in native populations form Sicily, Corsica and Sardinia. Overall, the long term maintenance of this pattern suggests, as a working hypothesis, an intriguing mechanism of genetically based intraspecific competition, and if so, a possible very interesting case study of ongoing natural selection of finely tuned preadapted life history traits between the original populations arrived from mainland and island sources, respectively.
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