A glitch in the Natrix: cryptic presence of alien grass snakes in Switzerland

Dubey, Sylvain and Ursenbacher, Sylvain and Schuerch, Johan and Golay, Joaquim and Aubert, Pascale and Dufresnes, Christophe. (2017) A glitch in the Natrix: cryptic presence of alien grass snakes in Switzerland. Herpetology Notes, 10. pp. 205-208.

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Official URL: https://edoc.unibas.ch/60823/

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We report the occurrence of alien grass snakes (Natrix natrix ssp.) in Western Switzerland (Lausanne), at a locality where striped grass snakes, presumably from Croatia (N. n. persa), escaped from outdoor enclosures of a reptile park in the 1970s, within the natural range of the threatened barred grass snake (N. n. helvetica). Three gravid females were captured at the introduction site in 2016: two exhibited colour patterns typical of native N. n. helvetica and the third had an intermediate phenotype. Yet, their neonates featured diverse colour patterns, several typical to N. n. persa. Genetic analyses identified two distinct mitochondrial alien lineages: one specific to N. n. persa/cypriaca and one specific to south-Alpine N. n. helvetica (genetically unrelated to native Western Swiss N. n. helvetica). These results suggest that alien grass snakes of multiple origins have established sustainable populations at the introduction site for the past 40 years, and potentially hybridized and introgressed with the local taxa. Hence, it alarms on the captive breeding practices of potentially invasive reptiles in animal parks, and adds to a long list of uncontrolled herps' introductions, a major threat to biodiversity in Western Europe.
Faculties and Departments:05 Faculty of Science
05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Naturschutzbiologie (Baur)
UniBasel Contributors:Ursenbacher, Sylvain
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Societas Europaea Herpetologica
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 Jul 2020 12:20
Deposited On:24 Jul 2020 12:20

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