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Phenotypic assortative mating and genetic population structure in the crab Trapezia digitalis

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Abstract

Colonies of Pocillopora spp. containing the crab Trapezia digitalis were collected from Hawaii in summer of 1979 and of 1980. Individuals of T. digitalis in Hawaii vary extensively in coloration of the carapace: crabs were separated into phenotypic classes by their degree of carapace reticulation. When presented with two females of different phenotype, males preferentially paired with the female which was similar to them in reticulation. The genetic population structure of T. digitalis was unusual by comparison with other species of Trapezia. Previously reported homozygote excesses at esterase-4, hexokinase-1, phosphoglucoseisomerase, and general protein-2 cannot be explained by the single-locus Wahlund effect, since there was not significant genetic differentiation among phenotypic classes, as measured by Wright's F ST statistic. There was significant variation among classes in allele frequencies at a fifth locus, hexokinase-2. Two pairs of loci were in significant gametic disequilibrium. Gametic disequilibrium was not detected in seven other species of Trapezia. It is suggested that multi-locus genetic analysis and an increased geographic sampling range are needed to determine the genetic population structure of T. digitalis in relation to observed variation in coloration.

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  1. Marine Biology Research Division, A002, Scripps Institution of Oceanography, University of California, 92093, San Diego; La Jolla, California, USA

    M. E. Huber

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Communicated by R. S. Carney, Baton Rouge

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Huber, M.E. Phenotypic assortative mating and genetic population structure in the crab Trapezia digitalis . Mar. Biol. 93, 509–515 (1987). https://doi.org/10.1007/BF00392788

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