Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Polychaete distribution and related physical parameters on sandy beaches of southern Monterey Bay, California
Student Author(s): Anderson, David
Miller, Roy
%E Rabone, Geoffrey
%E Wiggin, Donald
Faculty Advisor(s): Lee, Welton
Pages: 33
Location: Final Papers Biology 175H
Date: June 1972
Keywords: sandy beaches
Abstract: A 4.6 kilometer stretch of beach was sampled for polychaete distribution. Analysis shows these beach polychaetes to be divided into three groups with respect to tidal height. A high group of 4 species of sand and particle feeds clusters around the mean higher high water (+1.72 meters). A parallel group of sand and particle feeders occurs on the low beach (0.0 to 0.73 meters). A smaller group of predators spans the area from the low beach to the higher high water line. It is suggested that the polarization into high and low groups is caused by a central zone of substrate disturbance and/or by differing moisture and organic contents. The area of study contained two gradients. The first was a vertical gradient of moisture and organic content increasing with decreasing tidal height. The second was a lateral gradient of increasing wave action and sand size, decreasing organic content and water content, and decreasing species number.