Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Attrition on the Littorina planaxis population
Student Author(s): Bigler, Eric
Faculty Advisor(s): Abbott, D.
Pages: 28
Location: Final Papers Biology 175H
Date: June 1964
Keywords: periwinkle
Abstract: It is assumed that all Littorina planaxis eventually die; and that there is a steady turnover of individuals in the population. The most obvious possible causes of accidental death are being torn from the rocks and tumbled into the sea, and being eaten by possible predators as gulls, plovers, crabs, starfish and squirrels, theough these animals were never seen ransacking the L. planaxis colonies. Since the actual causes of death in the L. planaxis are not obvious, it was necessary to devise field studies and laboratory experiments which would bring out as many of these subtle fatal conditions as possible. The following paper deals first with the structure of the population as a whole; the second and third sections deal with the two large causes of attrition: wave shock and predation.