Population Genetics of the Sand Crab, Emerita analoga Stimpson, in Southern California
Journal of Experimental Marine Biology and Ecology
genetics, population, sand crab, genetic variation, population genetics, Emerita analoga, electrophoresis
Genetic variation at 25 enzymatic loci was studied by means of starch and acrylamide gel electrophoresis in six samples of the sand crab, Emerita analoga Stimpson, from southern California. Average heterozygosity was 0.07 ± 0.03 (SE) and five loci were polymorphic. Allele frequencies at a malate dehydrogenase locus were significantly different among samples. Genotype frequencies at an esterase locus and a phosphoglucomutase locus showed significant deviations from Hardy-Weinberg equilibrium in some samples. The activity of phosphoglucomutase was reduced in samples taken from the vicinity of the San Onofre Nuclear Generating Station (SONGS) and from Cabrillo Beach near Los Angeles Harbor. It has not been determined whether this is due to a decrease in the amount of the enzyme present, an inhibition of its activity or some other cause.
Richard Beckwitt, Population genetics of the sand crab, Emerita analoga Stimpson, in southern California, Journal of Experimental Marine Biology and Ecology, Volume 91, Issue 1, 1985, Pages 45-52, ISSN 0022-0981, http://dx.doi.org/10.1016/0022-0981(85)90219-9.