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Landscape Ecology

, Volume 34, Issue 11, pp 2615–2630 | Cite as

Topographical features and forest cover influence landscape connectivity and gene flow of the Caucasian pit viper, Gloydius caucasicus (Nikolsky, 1916), in Iran

  • Roya Adavodi
  • Rasoul Khosravi
  • Samuel A. Cushman
  • Mohammad KaboliEmail author
Research Article
  • 77 Downloads

Abstract

Context

The populations of the Caucasian pit viper are declining and face genetic threats because of habitat fragmentation. Landscape genetics facilitates effective connectivity conservation actions by providing methods to predict factors affecting gene flow.

Objectives

We described the genetic diversity and structure of Caucasian pit viper populations in Iran. We also adopted an individual-based landscape genetics approach to determine the effects of landscape features on gene flow across the species’ range.

Methods

We evaluated the degree of genetic structuring using spatial and non-spatial clustering methods. Then, we used restricted multivariate optimization and maximum-likelihood population effects modeling to predict landscape resistance to gene flow. Finally, we compared the predictions based on maximum-likelihood population effects modeling and reciprocal causal modelling in the context of multivariate optimization.

Results

Strong genetic structure was found between populations. Landscape genetics analysis showed that gene flow was related to forest cover density and topographic roughness. Gene flow was much higher in areas of low topographical roughness and was impeded by closed forests. We found an overall high similarity in multivariate optimization results obtained through reciprocal causal modeling and maximum-likelihood population effects modeling, suggesting that both approaches may produce consistent predictions.

Conclusions

Caucasian pit viper has limited dispersal abilities resulting in genetic structuring at short distances and gene flow appears to be influenced by natural features, in particular topographic roughness and forest cover density. Our findings have important implications for the species’ conservation and can be used to develop empirically supported prioritization of core habitats and corridors.

Keywords

Caucasian pit viper Gene flow Landscape genetics Landscape resistance Multivariate optimization 

Notes

Acknowledgements

This study was licensed by the Iranian Department of Environment under permits Nos. 94/6049 and 96/3631.

Supplementary material

10980_2019_908_MOESM1_ESM.docx (3 mb)
Supplementary material 1 (DOCX 3111 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Roya Adavodi
    • 1
  • Rasoul Khosravi
    • 2
  • Samuel A. Cushman
    • 3
  • Mohammad Kaboli
    • 1
    Email author
  1. 1.Department of Environmental Sciences, Faculty of Natural ResourcesUniversity of TehranKarajIran
  2. 2.Department of Natural Resources and Environmental Engineering, School of AgricultureShiraz UniversityShirazIran
  3. 3.Rocky Mountain Research StationUSDA Forest ServiceFlagstaffUSA

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