Reporting requirements for species on Annex II of the EU Habitats Dire
ctive necessitate comprehensive monitoring to be put in place in order
to determine whether Favourable Conservation Status has been achieved
. The results of three years' monitoring of a population of Vertigo an
gustior in a dune-saltmarsh transition are presented. A sampling progr
amme is described which is believed to generate reliable monitoring re
sults, however, further autecological work is necessary to identify op
timal conditions for sampling in relation to behavioural responses to
local weather patterns and to clarify the life cycle of V. angustior.