抄録
The micro-habitat, size composition, and movement pattern of the muricid snail Muricodrupa fusca were investigated. In contrast to two other muricids, Morula musiva and Thais clavigera, this species exclusively inhabits tidepools and its shell size is small. The adaptive implications of its small size are discussed in relation to the environmental conditions of its main habitat. Small size presents some advantages for living in tidepools with limited food resources. The major disadvantages of a small size, namely low tolerance to desiccation and increased vulnerability to predators, appear to be avoided by inhabiting tidepools. Mu. fusca moved landward in September and seaward in February, and reproduction is proposed as the reason for this migration.