(full paper is archived in the Miller Library)
Title: Submergence as osmotic stress and its role in habitat slection in the high intertidal limpet, Collisella digitalis
Student Author(s): Boggs, David
Faculty Advisor(s): Baxter, Chuck
Location: Final Papers Biology 175H
Date: June 1985
Keywords: biology of limpets
Abstract: The high intertidal limpet, Collisella digitalis, was kept continuously washed by sea water and compared with adjacent individuals under ambient conditions to determine whether prolonged submersion constituted a stress. The osmolarity of extracorporeal water and body fluid were monitored over four days, along with the force required to remove the limpets from the rock. The tenacity dropped markedly after nine hours of submersion and by four days was less than 50% of control animals. Increased tenacity was correlated with elevated osmolarity of body fluid. It is suggested that C. digitalis behaviorally regulates its body fluid at elevated levels and that prolonged submersion may constitute a physiological stress and set a lowre boundary for adults of the species.