(full paper is archived in the Miller Library)
Title: A comparative study of lethal temperatures in the limpets Acmaea scabra and Acmaea digitalis (Mollusca: Gastropoda: Prosobranchia)
Student Author(s): Hardin, Dane D.
Faculty Advisor(s): Epel, David
Location: Final Papers Biology 175H
Date: June 1966
Abstract: The lethal temperatures of two species of limpets which occupy the same intertidal levels were studied. It was found that A. scabra (with a critical range of 40-44 degrees Celsius) is better able to withstand high temperatures than is A. digitalis (with a critical range of 39-42C). Concurrent field studies showed that A. scabra experiences higher microhabitat and body temperatures than does A. digitalis at similar air temperatures. It was found that the limpets' body temperatures were 2-6 C higher than surrounding external temperatures. Intraspecific differences in temperature tolerence were also found, with the highest intertidal members of each species surviving better than the lowest members. Possible causes of intraspecific differences are acclimation or size of the animal.
Notes: Published 1968, Veliger 11(Suppl): 83-88