(full paper is archived in the Miller Library)
Title: Responses to light in the gastropod Clivella biplicata; evidence of a Circadian Rhythm
Student Author(s): Stetson, Magaret A.
Faculty Advisor(s): Abbott, Donald P.
Location: Final Papers Biology 175H
Date: June 1972
Keywords: sandy beaches
Abstract: 1. In the field Olivella biplicata exhibit a tendency to be above the sand at night and burrowing under in the sand in direct light. 2. Experiments on locomotor activity in light and darkness suggest a correlation between snail activity and presence on the sand surface, both of which are greater in conditions of darkness. 3. After exposure to normal and inverted 12 hr light:12 hr dark regimes under laboratory conditions, populations of Olivella biplicata exhibited oscillations in activity coinciding with those of controls or former oscillations during entrainment. This suggests the existence of a circadian rhythm.