Abstract
The impact of temporal changes in habitat availability and land use on the present genetic diversity of the grassland katydid species Metrioptera roeselii was investigated in an extensively used agricultural landscape (Lahn-Dill-Bergland, Germany) based on six microsatellite loci. By integrating spatial and temporal dimensions, this study contrasts to conventional approaches that usually record landscape changes at discrete points in time. Molecular data suggest little geographical substructuring of the species. Nevertheless, time-dependent effects on genetic diversity in terms of observed heterozygosity and allelic richness within subpopulations were detected by general linear models (GLM), explaining up to 82 and 13%, respectively. The results indicated that allelic richness was significantly reduced with higher rates of land-use change. Contrastingly, the level of heterozygosity even increased with increasing land-use change, if this rate increase was accompanied by a reduction in grassland amount, while with an increase of grassland amount the level of heterozygosity remained similar. Furthermore, depending on the study site, heterozygosity was differently affected by grassland age of sampled patches and of the surrounding. This is presumably induced by contrasting levels of heterozygosity in combination with differing modes of dispersal due to habitat availability and site-specific matrix effects. The loss of genetic diversity due to frequent land-use change might result in a reduced ability to adapt to landscape change, which is even more relevant in intensively used agricultural landscapes and in the course of climate change.
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Acknowledgments
The authors thank Tim Diekötter, Paul Arens, and Klemens Ekschmitt, and two anonymous reviewers for their very constructive comments on earlier versions of the manuscript. Thanks to Jens Dauber for help with parameters of habitat age and land-use change. Historical maps of land use were kindly provided by the Division of Landscape Ecology and Landscape Planning of the Justus Liebig University, Giessen, Germany. This study was funded by the German Research Foundation in context of the Collaborative Research Centre 299 (SFB 299). Laboratory work was financially supported by a Marie Curie Fellowship of the European Community programme Human Potential under contract number HPMT-CT-2001–00272.
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Holzhauer, S.I.J., Wolff, K. & Wolters, V. Changes in land use and habitat availability affect the population genetic structure of Metrioptera roeselii (Orthoptera: Tettigoniidae). J Insect Conserv 13, 543–552 (2009). https://doi.org/10.1007/s10841-008-9201-2
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DOI: https://doi.org/10.1007/s10841-008-9201-2