Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Rhythmic movement of the marine snail Tegula funebralis (prosobranchia: Trochacea) on intertidal rocks in relation to tidal and diel cycles
Student Author(s): Daniel, Matthew M.
Faculty Advisor(s): Abbott, Donald P.
Pages: 18
Location: Final Papers Biology 175H
Date: June 1978
Keywords: biological rhythms in marine and maritime organisms
Abstract: Studies in the intertidal zone and in outdoor tanks were carried out at Pacific Grove, California, to determine the movements of Tegula funebralis and the environmental events correlated most closely with them. The snails cluster in sheltered areas at low tide especially during the day. Movement of T. funebralis into the open and upward on rocks is positivley correlated with periods when the animals are washed and submerged. Tegula constantly submerged in outdoor aquaria showed no evidence of tidal rhythmicity, but followed a diel cycle of activity. During most of the day the snails stayed clustered under the rocks. In late afternoon and evening the snails moved out and climbed up the rocks and sides of the tanks.