Conservation Genetics

, Volume 15, Issue 2, pp 453–468

A 40-year-old divided highway does not prevent gene flow in the alpine newt Ichthyosaura alpestris

Authors

    • Ecosphère
    • Université de Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Lyon 1, ENTPE, CNRS
    • Institute of Life Sciences (ISV)Université Catholique de Louvain
  • Bernard Kaufmann
    • Université de Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Lyon 1, ENTPE, CNRS
  • Jean-Paul Léna
    • Université de Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Lyon 1, ENTPE, CNRS
  • Serge Fenet
    • Université de Lyon, UMR 5205 Laboratoire d’Informatique en Image et Systèmes d’information, Bat. Nautibus, Université Lyon 1, CNRS
  • François Pompanon
    • Université Joseph Fourier, Laboratoire d’Ecologie Alpine, CNRS, UMR 5553
  • Pierre Joly
    • Université de Lyon, UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Lyon 1, ENTPE, CNRS
Research Article

DOI: 10.1007/s10592-013-0553-0

Cite this article as:
Prunier, J.G., Kaufmann, B., Léna, J. et al. Conserv Genet (2014) 15: 453. doi:10.1007/s10592-013-0553-0

Abstract

Roads are of major concern in conservation biology, as they are known to restrict animal movements through landscape fragmentation, and may therefore impact genetic patterns in native terrestrial organisms. We assessed the effect of two large-scale transportation infrastructures (LTIs), a 40-year-old highway and a 30 year-old high-speed railway, on the spatial genetic structure of the alpine newt Ichthyosaura alpestris, a highly nomadic amphibian. Genetic data were gathered following a targeted individual-based sampling scheme and analysed using both overlay and correlative methods. While simulations suggested that the highway may be old enough for a significant barrier effect to be detected, LTIs were never detected as barriers to gene flow: inferred genetic boundaries rather coincided with transition zones between major landscape entities. Furthermore, spatial principal component analysis, a method designed to reveal cryptic genetic spatial patterns in high gene flow species, counter-intuitively suggested that the highway may act as a potential dispersal corridor in low-quality habitats, thus challenging traditional hypotheses on road impacts in amphibians. Our study showed that considering local interactions between species, infrastructures and landscape-specific characteristics is essential for better understanding the potential impacts of roads on movement patterns in terrestrial organisms.

Keywords

AmphibianBayesian clustering methodsCorrelative analysesLandscape geneticsSpatial Principal Component Analysis

Supplementary material

10592_2013_553_MOESM1_ESM.pdf (425 kb)
Supplementary material 1 (PDF 425 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2013