This publication offers technical advice providing a standardised protocol for monitoring conservation status on SACs. The survey method is more generally applicable.
This is part of our Good Practice Guidance for Invertebrates, produced by Paul Lee.
Reference: Killeen IJ & Moorkens EA (2003). Monitoring Desmoulin’s Whorl Snail, Vertigo moulinsiana. Conserving Natura 2000 Rivers Monitoring Series No. 6, English Nature, Peterborough.