Abstract
Abstract In the present paper we describe identity and homozygosity of genotypes in the seagrass Posidonia oceanica (L.)Delile (Posidoniaceae) in the Gulf of Trieste (Adriatic Sea). Forty shoots sampled off Koper coast (Slovenia) andthree samples from Grado (Italy) were analysed using microsatellite markers. The Koper meadow represents theonly remarkable extension of Posidonia oceanica recorded in the North-Adriatic region since 30 years. Resultsshow the existence of a single, homozygous genotype shared by all individuals. Causes for the observed lack ofheterozygosityand for the presence of a single, ancient P. oceanica clone in this regionare discussed. Total absenceof genetic variability is cause of major concern for conservation of the species in this region. Introduction The endemic seagrass species Posidonia oceanica (L.)Delile (Posidoniaceae) is a major component of theMediterranean coastal system, forming widespreadmeadows along coastlines of most part of the basin.In the past decade great concern about human-inducedregression of this marine angiosperm in the Medi-terranean Sea has developed (Marba et al. 1996).Studies on population genetics and phylogeographyof
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