Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Responses to osmotic stress in the chiton Cyanoplax hartwegii (Mollusca: Polyplacophora)
Student Author(s): McGill, Virginia L.
Faculty Advisor(s): Baxter, Charles
Pages: 15
Location: Final Papers Biology 175H
Date: June 1974
Keywords: chiton
Abstract: The small intertidal chiton Cyanoplax hartwegii (Carpenter, 1855) was found to be an osmoconformer over the range 75% to 125% of normal sea water using body fluid freezing point depression and body weight changes. The initial rapid weight change was subsequently reduced by volume regulation. After 24 hours of exposure at 13.5 degrees C all animals survived and had returned to within a few percent of initial weight. No behavioral modifications were noted: Animals remained attached, moved and did not clamp down. Its ability to withstand salinity fluctuations and to rapidly volume regulate are important adaptations of Cyanoplax hartwegii to the middle and high intertidal zones.
Notes: Publ 1975, Veliger 18 (Suppl): 109-112