Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Circadian and circatidal rhythms of population movement in adult and juvenile Orchestoidea corniculata (Crustacea: Amphipoda) on a central California sandy beach
Student Author(s): Baker, Andrew
Yip, Lynn
Faculty Advisor(s): Abbott, Donald
Pages: 36
Location: Final Papers Biology 175H
Date: June 1978
Keywords: biological rhythms in marine and maritime organisms
Abstract: A population of Orchestoidea corniculata on a steep sandy beach at Mussel Point, Pacific Grove, California was studied to determine movement activity at the sand surface. Sampling was done with directional and nondirectional pitfall traps on a transect taken from the land vegetation to sea. The adult field population shows peaks of activity that exhibit both the circadian and circatidal rhythms reported by earlier investigators. The peaks of movement activity of adults and juveniles do not occur simultaneously but show a temporal separation.