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Are species genetically more sensitive to habitat fragmentation on the periphery of their range compared to the core? A case study on the sand lizard (Lacerta agilis)

Landscape Ecology volume 32, pages 131–145 (2017)Cite this article

Abstract

Context

Species show different sensitivity to habitat loss and fragmentation depending on their specialization. Populations of a species at the range margin are generally assumed to be more stenoecious than populations at the core of the distribution and should therefore be more sensitive to habitat fragmentation.

Objectives

We evaluated the hypothesis that fragmentation effects species more strongly at the range periphery of their range compared to the core, resulting in lower genetic variability in comparable patch sizes and lower gene flow among populations.

Methods

We compared the genetic diversity and structure of five sand lizard (Lacerta agilis) populations at the margin of its range in Bulgaria and of 11 populations at the core of its distribution in Germany. We based the analysis on microsatellites, comprising 15 loci in Bulgaria and 12 in Germany.

Results

All diversity indices declined with patch size. For medium-sized patches all diversity indices were lower at the range periphery compared to the core, with two of them being significant. AICc based model selection showed strong support for core/periphery and patch size effects for observed and expected heterozygosity but only a patch size effect for allelic richness. There was no isolation-by-distance and each sampled population was allocated to a separate cluster with high probability for both countries, indicating that all populations are (almost) completely isolated.

Conclusion

Our study indicates an increased sensitivity of a species to fragmentation at the periphery compared to the core of its distribution. This differential sensitivity should be accounted for when prioritizing species based on their fragmentation sensitivity in landscape management.

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Acknowledgments

We thank Conrad Helm, Stefan Schaffer, Ana María Prieto Ramírez, Ronny Wolf and Nico Hesselbarth for assisting in the field and Heiko Stukkas for assistance concerning some of the statistical analyses.

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Authors and Affiliations

  1. Department of Conservation Biology, UFZ – Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany

    Klaus Henle & Annegret Grimm

  2. Working group Molecular Evolution and Animal Systematics, Institute of Biology, University of Leipzig, Talstr. 33, 04103, Leipzig, Germany

    Claudia Andres, Detlef Bernhard & Martin Schlegel

  3. iDIV–German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany

    Klaus Henle & Martin Schlegel

  4. Invertebrates Department, National Museum of Natural History, Sofia, Tsar Osvoboditel Blvd. 1, 1000, Sofia, Bulgaria

    Pavel Stoev

  5. Pensoft Publishers Ltd., 12, Prof. G. Zlatarski St., 1700, Sofia, Bulgaria

    Pavel Stoev

  6. Vertebrates Department, National Museum of Natural History, Sofia, Tsar Osvoboditel Blvd. 1, 1000, Sofia, Bulgaria

    Nikolay Tzankov

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  1. Klaus Henle
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Correspondence to Klaus Henle.

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Nikolay Tzankov recently deceased

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Henle, K., Andres, C., Bernhard, D. et al. Are species genetically more sensitive to habitat fragmentation on the periphery of their range compared to the core? A case study on the sand lizard (Lacerta agilis). Landscape Ecol 32, 131–145 (2017). https://doi.org/10.1007/s10980-016-0418-2

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  • DOI: https://doi.org/10.1007/s10980-016-0418-2

Keywords

  • Lacertidae
  • Fragmentation sensitivity
  • Genetic variability
  • Genetic structure
  • Isolation-by-distance
  • Patch size
  • Range core
  • Range periphery