Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Phototaxis and behavioral responses to changes in light intensity in the high tide pool copepod Tigriopus californicus
Student Author(s): Glaser, Tom
Faculty Advisor(s): Abbott, Don
Pages: 53
Location: Final Papers Biology 175H
Date: June 1977
Keywords: high tide pools
Abstract: Tigriopus californicus, a high tide pool copepod, shows several separate responses to light. Dark-adapted T. californicus deominstrate a marked decrease in activity immediately following the onset of illumination, reaching a minum after 1-2 minutes. Quantitative analysis of the light response indicates: (1) T. californicus exhibits a heightened sensitivity to light at an intensity of 0.35 watts/m^2, (2) dark-adapted T. californicus more readily adapts to dim light than strong light, (3) the swimming velocity and activity of T. californicus increases with the intensity of light exposed to. T. californicus exhibits a specific "dart-and-freeze" response to shadow which may involve independent kinetic and tactic reactions, and which may be an escape mechanism.