Table 3. Results of an analysis of molecular variance (AMOVA) showing the distribution of the genetic variation among groups, among populations within groups and within populations based on 16 microsatellites.

Source of variation	Sum of squares	Variance components	Percentage variation
Among groups	21.734	0.023	1.08*	FCT = 0.011*
Among populations within groups	12.101	0.007	0.31	FSC = 0.003
Within populations	2127.061	2.083	98.60*	FST = 0.014*
Total	2160.896	2.113

Gulf of Cádiz (Atlantic coast): Isla Canela and Doñana. Alboran Sea (southwestern Mediterranean coast): Caleta de Vélez and Cabo de Gata. Northwestern Mediterranean coast: Gandía, Sant Carles de la Ràpita and Roses.

*Significant P-value (<0.05).