Comparison of Intraspecific Genetic Diversity Levels among Local Populations in Decapod Crustacean Species; with Some References of Phenotypic Diversity

Abstract

The genetic differentiation among local populations (GST) was reviewed in 20 decapod crustaceans which could be classified into three groups; marine, anadromous, and landlocked. The mean GST values in each group significantly increased in the order of marine (0.039), “anadromous” (0.090), and landlocked (0.228) groups. These variations are mainly contributed to geographic barriers. Distinct gstvalues,however, were observed even between species within a group (especially marine and anadromous). This suggested that species-specific dispersal ability and migratory character are contributory to the differentiated level of gstamong species besides the intensity of geographic barriers. © 1987, The Japanese Society of Fisheries Science. All rights reserved.