Abstract
The stability and long-term survival of animal populations in fragmented landscapes largely depends on the colonisation of habitat patches and the exchange of individuals between patches. The degree of inter-patch dispersal, in turn, depends on the dispersal abilities of species and the landscape structure (i.e. the nature of the landscape matrix and habitat distribution). Here, we investigated the genetic structure of populations of Metrioptera bicolor, a wing-dimorphic bush cricket, in a spatially structured landscape with patches of suitable habitat distributed within a diverse matrix of different habitat types. Using six microsatellite markers, we assessed the effects of geographic distance and different matrix types on the extent of genetic differentiation among 24 sampling sites. We found that forest and a river running through the study area both impede inter-patch dispersal. The presence of these two matrix types was positively correlated with the extent of genetic differentiation between sites. In addition, we found a significant positive correlation between pairwise genetic and geographic distances for a subsample of sites which were separated only by arable land or settlements. For the complete data set, this correlation could not be found. This is most probably because the adverse effect of forest and river on gene flow dominates the effect of geographic distance in our limited set of patches. Our analyses clearly emphasize the differential resistance of different habitat types on dispersal and the importance of a more detailed view on matrix “quality” in metapopulation studies.
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Acknowledgments
We thank Thomas Hovestadt for helpful comments on the sampling design, Georg Popp and Beatrice Schuster for helping with the collection of genetic samples, Karin Möller for assistance in the laboratory, and Marina Meixner and Thomas Hovestadt for proofreading our manuscript. We also thank the government of Lower Franconia for the permission to work in the nature reserve ‘Hohe Wann’. Ina Heidinger was funded by the ‘Deutsche Bundesstiftung Umwelt’ (DBU).
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Heidinger, I.M.M., Hein, S., Feldhaar, H. et al. The genetic structure of populations of Metrioptera bicolor in a spatially structured landscape: effects of dispersal barriers and geographic distance. Conserv Genet 14, 299–311 (2013). https://doi.org/10.1007/s10592-013-0449-z
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DOI: https://doi.org/10.1007/s10592-013-0449-z