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Web End = Conserv Genet (2015) 16:549558
DOI 10.1007/s10592-014-0679-8
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Web End = Fragmentation genetics of the grassland buttery Polyommatus coridon: Stable genetic diversity or extinction debt?
Jan Christian Habel Sabrina V. Brckmann
Jochen Krauss Julia Schwarzer Alfons Weig
Martin Husemann Ingolf Steffan-Dewenter
Received: 28 July 2014 / Accepted: 6 November 2014 / Published online: 17 December 2014 Springer Science+Business Media Dordrecht 2014
Abstract Habitat fragmentation can have severe effects on the intraspecic variability of populations and thus plays a pivotal role in species conservation. Especially taxa with specic habitat demands and low dispersal behaviour suffer from habitat fragmentation. One such taxon, the Chalk-hill Blue buttery, Polyommatus coridon, nowadays mostly occurs in small and isolated, calcareous grasslands across Central Europe. Here we investigate the population genetic structure of 15 local populations of this buttery species over major parts of the Frankische Schweiz (south-east Germany). Based on seven polymorphic microsatellites we estimate genetic diversity and differentiation. We use the data to test for potential effects of different habitat sizes, habitat connectivity, and population density. We found high genetic diversity but no signicant genetic differentiation among the 15 local populations (FST = 0.0087, P [ 0.05).
Genetic diversity was not correlated with habitat size, habitat connectivity, or census population size. But, we found a marginally positive correlation between increasing habitat connectivity and population density (r2 = 0.31, P \ 0.05).
Compared to other buttery species, our data resemble a generalist species with well connected populations rather than a specialist taxon existing in a highly fragmented landscape. The high genetic diversity and the lack of differentiation might either be the result of relatively large and stable local populations and ongoing gene ow, or is the genetic legacy of formerly large and interconnected populations during periods of extensive agriculture.
Keywords Census population size Genetic diversity
Genetic differentiation Habitat fragmentation Habitat
connectivity Habitat size
Electronic supplementary material The online version of this article (doi:http://dx.doi.org/10.1007/s10592-014-0679-8
Web End =10.1007/s10592-014-0679-8 ) contains supplementary material, which is available to authorized users.
J. C. HabelTerrestrial Ecology Research Group, Department of...