Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Tidal rhythmicity in the cirral activity of the Californian intertidal barnacles Chthamalus fissus and Balanus glandula (Cirripedia: Crustacea)
Student Author(s): Funkhouser, Thomas
Faculty Advisor(s): Baxter, Chuck
Pages: 21
Location: Final Papers Biology 175H
Date: June 1982
Keywords: upper intertidal
splash zone
Abstract: An endogenous circatidal rhythm was described in both individuals and populations of the upper intertidal barnacles Balanus glandula and Chthamalus fissus. These rhythms persisted for at least 8 days under constant conditions with peaks of activity initially corresponding to times of high tide. A circatidal period of 27 hours was observed in activity of Balanus glandula, while the period of activity of Chthamalus fissus, 25 hours, was much closer to that of the tidal cycle. No circadian rhythms were observed in any individuals or populations studied under constant conditions in the field. The hypothesis was made that the adaptive advantage of such an endogenous rhythm would be in the ability to anticipate periods of activity and inactivity and physiologically prepare for them.