NatureScot Commissioned Report 616: Whorl snails (Vertigo spp.) surveillance in Scotland: A condition assessment of Geyer’s whorl snail Vertigo geyeri, and the round-mouthed whorl snail Vertigo genesii in Perthshire and the Black Isle

Both Vertigo geyeri and V. genesii are listed on Annex II of the EC Habitats Directive. Both species are known from sites in Perthshire and on the Black Isle, and, in addition, V. geyeri is known from sites on Islay. To provide information for the next round of Article 17 reporting, due in 2013, a condition assessment of Vertigo geyeri and V. genesii has been carried out at a selection of sites in Perthshire, and sites in the Black Isle and Deeside, using methods designed to allow assessments of population, habitat and future prospects. The Condition Assessment for Vertigo geyeri was 'favourable-maintained'. The species was generally widespread and common at all sites surveyed with the exception of the Deeside sites where it was not found. The Condition Assessment for Vertigo genesii was 'favourable-declining'. Although habitat and future prospects were assessed as 'favourable-maintained', population was assessed as 'favourable-declining' due to the absence of the species at two sites from where it had been formerly recorded.

Pages: 71
Published: 2013

NatureScot Commissioned Report 616