(full paper is archived in the Miller Library)
Title: Some observations of predation on Acmaea species by the crab Pacygrapsus crassipes (Mollusca: Gastropoda: Prosobranchia) (Arthropoda: Crustacea: Decapoda)
Student Author(s): Chapin, Dexter
Faculty Advisor(s): Phillips, John
Location: Final Papers Biology 175H
Date: June 1966
Abstract: Predation on Acmaea populations by various predators including the crab, Pachygrapsus crassipes, was studied. Laboratory observations and experiments indicate that the crab can remove the peak of an Acmaea shell by applying pressure with the cheliped on a fracture zone encircling the shell above the muscle scar. The results of a survey of Amaea shell cast up on the beach at Pacific Grove, California, and the number of limpets dispatched by the crabs in the laboratory indicate tha Pachygrapsus crassipes is responsible for significant mortality in limpet populations.
Notes: Published 1968, Veliger 11(Suppl): 67-68