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Differing long term trends for two common amphibian species (Bufo bufo and Rana temporaria) in alpine landscapes of Salzburg, Austria

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  • Martin Kyek
  • Peter H Kaufmann
  • Robert Lindner

Abstract

This study focuses on the population trends of two widespread European anuran species: the common toad (Bufo bufo) and the common frog (Rana temporaria). The basis of this study is data gathered over two decades of amphibian fencing alongside roads in the Austrian state of Salzburg. Different statistical approaches were used to analyse the data. Overall average increase or decrease of each species was estimated by calculating a simple average locality index. In addition the statistical software TRIM was used to verify these trends as well as to categorize the data based on the geographic location of each migration site. The results show differing overall trends for the two species: the common toad being stable and the common frog showing a substantial decline over the last two decades. Further analyses based on geographic categorization reveal the strongest decrease in the alpine range of the species. Drainage and agricultural intensification are still ongoing problems within alpine areas, not only in Salzburg. Particularly in respect to micro-climate and the availability of spawning places these changes appear to have a greater impact on the habitats of the common frog than the common toad. Therefore we consider habitat destruction to be the main potential reason behind this dramatic decline. We also conclude that the substantial loss of biomass of a widespread species such as the common frog must have a severe, and often overlooked, ecological impact.

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  • Martin Kyek & Peter H Kaufmann & Robert Lindner, 2017. "Differing long term trends for two common amphibian species (Bufo bufo and Rana temporaria) in alpine landscapes of Salzburg, Austria," PLOS ONE, Public Library of Science, vol. 12(11), pages 1-17, November.
    • Handle: RePEc:plo:pone00:0187148
    DOI: 10.1371/journal.pone.0187148
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    References listed on IDEAS

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    1. Jeff. E. Houlahan & C. Scott Findlay & Benedikt R. Schmidt & Andrea H. Meyer & Sergius L. Kuzmin, 2000. "Quantitative evidence for global amphibian population declines," Nature, Nature, vol. 404(6779), pages 752-755, April.
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