Biologia, Bratislava 55/3: 289-297, 2000.
ISSN 0006-3088 (Biologia). ISSN 1335-6399 (Biologia. Section Cellular and Molecular Biology).
Genetic composition and temporal genetic variation in Mytilus galloprovincialis populations of the Thermaikos gulf (Northern Aegean Sea).
Nikoletta Kravva1, Alexandra Staikou2 & Costas Triantaphyllidis1*
1 Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University, GR-54006 Thessaloniki, Macedonia, Greece; tel.: ++30 31 998309, fax: ++30 31 998374, e-mail: Triant@bio.auth.gr
2 Department of Zoology, School of Biology, Aristotle University, GR-54006 Thessaloniki, Macedonia. Greece
* corresponding author
Allozymic variation and genetic differentiation were investigated in three (one natural and two cultured) populations of Mytilus galloprovincialis Lamarck (1819), from Thermaikos Gulf (Macedonia, Greece) using starch gel electrophoresis. Low genetic distance values were found among the studied populations. The estimate of Nem (12.3) suggests some degree of isolation between the natural and the cultured populations. The estimated mean heterozygosity values were lower than those found by other investigators for the same species elsewhere but similar to those previously reported from Greece. Consistent significant Ho heterozygote deficiency was observed at several loci. Ho and He mean values did not exhibit statistically significant changes between the two culture populations in the course of one year and three year periods. In addition the temporal genetic variation of the two cultured populations was further examined in the course of the same periods. The observed significant heterogeneity of the genotype and allele frequencies of Idh-2, Pgm-1, Est-2 loci could be caused by the possible involvement of selection.
Key words: temporal variation, genetic composition, allozymes, M. galloprovincialis, Greece.