Population structure and fluctuations in the snail fauna of a Malayan limestone hill



Five out of the nine species of minute or small snails living on Bukit Chintamani, Pahang, occur in large numbers on accessible limestone faces. Prosobranchs dominate moss-covered rock while vertiginid pulmonates are more abundant on exposed, moss-free rock. The populations of mossy and moss-free rock are analysed and the archaeogastropod Hydrocena is shown to be the most numerous in both situations. In all other species studied, the