Low Genetic Variability and High Similarities in the Crayfish Genera Cambarus and Procambarus

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Abstract
Electrophoretic analysis of 19 general protein and enzyme loci was used to investigate relationships among 6 spp. of crayfish inhabiting the Savannah River Plant near Aiken, South Carolina, USA. One species of the genus Cambarus (C. latimanus) and 5 spp. of the genus Procambarus (P. ranei, P. pubescens, P. hirsutus, P. acutus, P. troglodytes) were studied. Of 19 loci 7 were polymorphic in at least 1 spp. while 12 loci were consistently monomorphic in all species. The mean heterozygosity (H) for all species was 0.016 .+-. 0.01. Nei''s identity values (I) were calculated for all species pairs. The average I between Procambarus species was 0.78 .+-. 0.1 and the range was 0.63-0.89. The average I between C. latimanus and the Procambarus species was 0.51 .+-. 0.04. H in decapod crustaceans is low compared to that of other organisms.

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