Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The effects of sewage on the righting response of the hermit crab Pagurus samuelis (Stimpson, 1857)
Student Author(s): McCabe, Melanie
Faculty Advisor(s): Abbott, Don
Pages: 29
Location: Final Papers Biology 175H
Date: June 1970
Keywords: sewage pollution
Abstract: In these experiments, samples of the hermit crab, Pagurus samuelis were taken from polluted and unpolluted areas around the southern end of Monterey Bay. These samples were tested for their righiting response times and a summary of the results of these tests follows: 1. When righting response time was measured immediately after capture, crabs from unpolluted waters (Hopkins Marine Station) measured in unpolluted water exhibited a significantly faster righting response than crabs from polluted areas timed in water from their environments. 2. Crabs from polluted water (Point Pinos) placed in unpolluted water for 24 hours showed a significant increase in teh speed of righting. 3. crabs from Hopkins Marine Station immersed in 2% and 4% dilutions of sewage exhibited a significant decrease in their spped of righting after 24 hours.