Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Endogenous tidal feeding rhythms in the intertidal barnacles Chthamalus dalli and Chthamalus fissus
Student Author(s): Carlson, Sharon J.
Roux, Richard D.
Faculty Advisor(s): Burnett, Robin
Pages: 26
Location: Final Papers Biology 175H
Date: June 1978
Keywords: biological rhythms in marine and maritime organisms
Abstract: 1. Experiments conducted at Hopkins Marine Station, Mussel Point, Monterey Bay, California, have revealed that the intertidal barnacles Chthamalus dalli and C. fissus exhibit tidal feeding rhythms under conditions of constant temperature, constant light and constant submersion. 2. For both species of barnacle, the period of rhythm is between 11.5 and 12.5 hours. 3. It appears that C. dalli shows a clearer rhythm than C. fissus. However, this has yet to be ascertained unequivocally and could be a product of differences in collection sites. 4. Vibration, water currents, water volume and temperature are factors which can modfy the character of the feeding rhythms. 5. The phase of the rhythm can be shifted by experimentally reversing the time course of the periods of exposure and submersion. 6. Clearest and most persistent rhythmicity was observed with maximum water volume and minimum vibration.