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Population size and land use affect the genetic variation and performance of the endangered plant species Dianthus seguieri ssp. glaber

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Abstract

Human activity and land use changes in the past decades have led to landscape homogenization and small-scale fragmentation of grassland habitats in most regions of central Europe. As a result, populations of many grassland species are small and strongly fragmented, facing extinction due to genetic depauperation and local maladaptation in remnant habitats. In this study, remaining populations of the strongly endangered grassland species Dianthus seguieri ssp. glaber (“Ragged Pink”) in Bavaria were investigated in order to evaluate the environmental factors influencing its genetic variation and performance. We first evaluated habitat, vegetation and population structure. Species performance was then studied by assessing the number of generative shoots, flowers and fertile capsules; and evaluating seed weight and seed viability. Finally, genetic variation was analyzed using molecular markers (AFLPs). Our analyses revealed that population size and land use abandonment have the strongest impact on genetic variation and species’ performance. Large and extended populations were most variable. 72 % of overall genetic variability of Dianthus seguieri ssp. glaber was found to be within populations, whereas 28 % remained between populations. Increased vegetation height and coverage, and a high proportion of gramineous species resulting from the lack of land use, reduced genetic variation, effective fruit and seed set. Our study shows that both population size and land use abandonment need to be considered to ensure the long term protection of endangered plant species. Maintaining an open habitat structure and adequate soil nutrient conditions through targeted annual mowing regime, over-storey vegetation trimming and green waste removal and the establishment of vegetation buffer strips will allow this species’ persistence and continuous recruitment.

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Acknowledgments

The authors thank G. Schneider, M. Scheuerer and E. Möhrlein for their help with plant localities; the government of the Upper Palatinate and of Upper Bavararia for the kind permission of our research, C. Schmid for his support in statistical analysis and P. Poschlod for his generous support.

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  1. Institute for Landscape Ecology, Westfälische Wilhelms-University Münster, 48149, Münster, Germany

    Verena Busch

  2. Institute of Plant Sciences, University of Regensburg, 93040, Regensburg, Germany

    Christoph Reisch

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  1. Verena Busch
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Correspondence to Christoph Reisch.

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Busch, V., Reisch, C. Population size and land use affect the genetic variation and performance of the endangered plant species Dianthus seguieri ssp. glaber . Conserv Genet 17, 425–436 (2016). https://doi.org/10.1007/s10592-015-0794-1

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