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Étude de l’habitat et des exigences écologiques du Vertigo geyeri Lindholm, 1925 dans le Massif jurassien

Ophélie LASNE, Julien RYELANDT, Michal HORSAK & Veronika HORSAKOVA

fr Naturae 2021 (2) - Pages 21-33

Published on 18 January 2021

This article is a part of the thematic issue Colloque national de malacologie continentale, Nantes, 6 et 7 décembre 2018

Habitat preferences of Vertigo geyeri Lindholm, 1925 in the Jura Mountains, France.

The Geyer’s whorl snail (Vertigo geyeri Lindholm, 1925) is a very small mollusc (< 2 mm), registered to the Habitat Directive. Franche-Comté region in France is situated on the occidental limit of its distribution in mainland Europe and is hosting the main population in the country. Within a second year master internship, this study was conducted to characterize the snail’s habitat and environmental requirements, through the analysis of botanical and malacogical associations, and main environmental parameters. Therefore, 32 sites have been sampled in 2016 and 2018 in the Jura Mountains. The wet sieving technique has been used for the malacogical sampling, in addition to a botanical survey (vascular plants and mosses). We were able to associate the snail with alkaline fens with marsh clover and mosses from the Amblystegiaceae family (Caricenion lasiocarpae), with Menyanthes trifoliata L. and Scorpidium cossonii Hedenä as structuring species. These wetlands are usually open, with important hydraulic network, sparse vegetation and nutrient limited soil. 

Keywords :
Mollusc, Franche-Comté, low marshes.
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