Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The geotatic responses of Littorina planaxis
Student Author(s): Klabunde, Paul Jon
Pages: 20
Location: Final Papers Biology 175H
Date: June 1964
Keywords: periwinkle
littorina
Abstract: The primary purpose of this paper is to examine the geotatic responses of Littorina planaxis and to explain these responses in terms of adaptive significance. The study was begun with field observations of the Littorines at the Hopkins Marine Station, where the high intertidal habitat of the snails is divided into adjacent horizontal and vertical planes by granite boulders and promontories. The Littorines are distributed on both the primarily horizontal surfaces (O to 15 degrees in this study) and the primarily vertical surfaces (70 to nearly 90 degrees in this study). In the field studies, snails on vertical surfaces were found to exhibit an apparent geotaxic respnse, moving up or down the rock surface, depending ont he condition of the light and the tidal height. Snails from horizontal surfaces, of course, cannot show the same type of behavior, nor is it called for during their daily behavior.