Abstract
Even though reptiles are threatened worldwide, few studies address their conservation, especially snakes. The goal of our study was to measure the genetic structure of a widely distributed temperate reptile, the smooth snake Coronella austriaca using microsatellite markers in two different areas at the core (Alsace, north-eastern France) and at the edge (Wallonia, southern Belgium) of its range. We sampled 506 individuals in 38 localities (respectively 10 and 28). Analysis of genetic structure conducted with a clustering method detected three clusters in Alsace, one group gathering all populations but two. In Wallonia, differentiation was observed on both sides of the Meuse River and in the Southern Ardenne region (southernmost sampling sites). Spatial autocorrelation analysis showed that statisticaly more related individuals occur together up to a distance of 2.8 km in Alsace and up to 10 km in Wallonia. Isolation by distance was detected in Wallonia but the distance explained a very limited part of the differentiation (r = 0.033), whereas no isolation-by-distance pattern was detected in Alsace. Even though genetic differentiation between populations separated by large rivers, highways, or crop fields was detected, dispersal between populations seem currently sufficient to avoid any kind of genetic drift in both regions. These results are similar to a previous study conducted in Poland, but strongly contrast with another analysis held in England which detected a sharp genetic structuring among populations that are geographically close. We consequently suggest that discrepancies could be related to the ecology of island populations and smaller densities.
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Data availability
All DNA samples are deposited in the Natural History Museum Bern, Switzerland.
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Acknowledgements
We are grateful to the following people for providing help on the field and in the lab: Nicolas Boileau, Gaël Fellet, Charles Huyttenhoven, Charlotte Mathelart, Barbara Meister, Victoria Michel, Daniel Muller, Eric Pellerin†, Matthieu Raemy, Laurent Schwebel†, Jacques Thiriet. We also thank three anonymous referees for their useful comments that helped improve the quality of this article. We would like to dedicate this article to the memory of Laurent Schwebel, a dear friend and fellow naturalist who passed away in 2012 and whose help on the field was invaluable, and to the memory of Eric Pellerin who helped us collect data in Belgium.
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This study benefited of the support of the “Département de l'Etude du Milieu Naturel et Agricole du Service Public de Wallonie”.
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JPV, EG, JC, and SU designed the study and wrote the manuscript. JPV did the field work in Alsace and the subsequent lab work. EG and JC did the field work in Wallonia. JPV, JC, and SU analysed the data.
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Permits (no reference number provided) were delivered by the Prefect of Alsace to J.-P. Vacher, and by the department of Nature and Forest from Wallonia Public Service to E. Graitson for capture and handling of Coronella austriaca. Snakes were captured and released on spot right after sampling, no other tissue/blood collection has been performed other than buccal swabbing. A permit to drive on forest tracks in the Haut-Rhin department was issued to J.-P. Vacher by the National Forest Department (Mr. Pierrat, Mulhouse, France).
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Vacher, JP., Graitson, E., Cauwenbergh, J. et al. Conservation genetics of a wide-ranged temperate snake: same species, different locations, and different behaviour. Conserv Genet 23, 167–177 (2022). https://doi.org/10.1007/s10592-021-01416-4
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DOI: https://doi.org/10.1007/s10592-021-01416-4