(full paper is archived in the Miller Library)
Title: Biochemical, population genetics, migration, and gene flow in a central California barnacle population
Student Author(s): Ford, Michael
Faculty Advisor(s): Powers, Dennis
Location: Final Papers Biology 175H
Date: June 1990
Abstract: The biochemical genetics of an intertidal barnacle, Tetraclita rubescens (Darwin, 1854), were examined at four sample sites along the coast of central California. Examination of the allelic frequencies at four polymorphic loci indicate that gene flow between subpopulations is either currently high or was so very recently. Not all sites, however, appear to exchange migrants equally. The samples from the Moss Landing site appear to be closely related to each other and other evidence suggests that Moss Landing may be quite isolated from the more southern populations. Point Conception does not appear to be a major barrier to gene flow, and migration between Pacific Grove and Port Hueneme, three hundred miles away, appears to be greater than migration between Pacific Grove and Moss Landing, only twenty miles away. A population of Semibalanus cariosus (Pallas, 1788) was also studied, and found to be almost indistinguishable from the Tetraclita populations at all four polymorphic loci scored. This indicates that strong selection pressures may be maintaining these allelic frequencies, and the polymorphisms may be older than the species themselves.