Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Tolerance of Tigriopus californicus (Baker, 1912) to slow increases in salinity produced by evaporation and hypersaline solutions
Student Author(s): Stoller, David W.
Faculty Advisor(s): Phillips, John
Pages: 29
Location: Final Papers Biology 175H
Date: June 1977
Keywords: high tide pools
Abstract: The susceptibility of Tigriopus californicus (Baker, 1912) from the coast of Central California to high salinites was studied using evaporation and hypersaline solutions. The ED-50 for coma occurring during 2 days of evaporation was 144 0/00 with a 95% confidence interval of less than +/- 0.003. The ED-50's for three different rates of salinity increase produced by the addition of hypersaline solutions were 132.2, 145.2, and 154.40/00 with f-ED's of 1.02, 1.01, and 1.01 with 100% coma occurring at 10, 40, and 70 hours respectively. Fifty percent of the animals became inactive but not comatose at a salinity of 93.3 0/00 with a 95 % confidence range of 97.97 to 88.86 0/00 during a 2 day period of evaporation. Females with egg sacs appear to be more resistant than the general population.