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Allozymic variation of 13 gene loci was investigated in 2 samples of Corallium rubrum (L.) collected in the Tyrrhenian Sea (Tuscany, Italy), at the coastal Calafuria cliff (south of Leghorn) and at Elba Island (Tuscan Archipelago) respectively. Among 5 polymorphic loci, Pgm and Pgi showed the highest level of heterozygosity. In the Elba sample all polymorphic loci were in Hardy-Weinberg equilibrium, whereas in the Calafuria sample, Pgm and Pgi were not. Mixing of individuals from genetically different subpopulations (Wahlund effect) may cause this disequilibrium. Nei's indices together with F-statistics show that the samples investigated can be considered as 2 distinct local populations. The results suggest that limited larval dispersal may be more important in promoting C. rubrum population differentiation than differential selection on the migrating larvae.

Genetic variation within and between two Tyrrhenian populations of the Mediterranean alcyonarian Corallium rubrum