Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: A behavioral pattern of the mysid shrimp Acanthomysis sculpta in relation to kelp
Student Author(s): Neils, Eric W.
Faculty Advisor(s): Baxter, Charles
%E Harding, Lawrence
Pages: 20
Location: Final Papers Biology 175H
Date: June 1978
Keywords: biological rhythms in marine and maritime organisms
Abstract: The mysid shrimp Acanthomysis sculpta was observed to associate closely with the kelp canopy of Macrocystis beds during the day. At night but almost never during the day, it was found in plankton tows through open water adjacent to the kelp forest, suggesting nocturnal movement away from kelp. In constant light A. sculpta remained closely associated with kelp in aquaria and virtually never moved into adjacent open water. When subjected to a light - dark cycle 14:10 regime which coincided with day and night, more mysids moved away from kelp at night than during the day. In constant darkness A. sculpta showed an endogenous circadian behavioral pattern of close associaton with kelp during the subjective day and movement away from kelp during the subjective night. This behavior is discussed in terms of possible selective advantages, such as avoidance of predation and feeding on zooplankters which are present in the water column at night.