ALLOZYME SIMILARITY IN TWO MORPHOLOGICALLY DISTINGUISHABLE POPULATIONS OF PARACENTROTUS LIVIDUS (ECHINODERMATA) FROM DISTINCT AREAS OF THE MEDITERRANEAN COAST

摘要

Allozymes of Paracentrotus lividus from Palermo Gulf in the northern Sicilian coast (Italy) and from a small body-size population in the western Greek coast (Ionian Sea) were investigated by PAGE. Five of the twenty examined loci were polymorphic (AAT, ADH, ME, PGI and PGM) over each population with a polymorphism value of 0.25. Average heterozygosity was equal to 0.081 in the Sicilian sample and 0-084 in the Greek. Deviations from Hardy-Weinberg equilibrium were significant in ME and PGI loci (as calculated by X~2). Nei's (1978) genetic distance (D=0.0025) index described a close identity between the two samples.