Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: High-temperature induced torpor in latitudinally separated populations of Tigriopus californicus, after acclimation at 20 C
Student Author(s): Bingham, Elizabeth M
Faculty Advisor(s): Baxter, Charles H.
Pages: 19
Location: Final Papers Biology 175H
Date: June 1977
Keywords: high tide pools
Abstract: There appears to be both microhabitat and major habitat differences in the high-temperature torpor response of Tigriopus californicus corresponding to their geographic origins. 38 C is a critical temperature for all the populations. The determining factor in high-temperature related torpor is time, as the tolerance periods vary significantly between the populations. egg-carrying females can withstand high temperatures significantly better than the males. There is a large variation within an individual's torpor response to repeated high temperature stresses. However, the populations as a whole do maintain a consisitent order of the least tolerant to the most reisistant of temperature: North, Hopkins, South, L.A.1, L.A.2. These finding suggest a genetic basis for geographic differences in temperature tolerance as the 20-day minimum acclimation at 20 C would presumably eliminate any different short-term adaptations due to different environments.