Table 2.

AMOVA from the 27 populations of P. perna distributed over seven distinct groups based on mitochondrial Cox1 gene and seven nuclear microsatellites.

Source of variation	d.f.	Sum of squares	Variance components	Percentage of variation	ɸ-statistics	P-value
Cox1 gene
Among groups	6	6.327	0.0037	0.53	0.0053	0.006
Among populations within groups	20	13.717	−0.0004	−0.05	−0.0005	0.505
Within populations	703	488.654	0.6951	99.52	0.005	0.126
Total	729	508.699	0.6985
Microsatellites
Among groups	6	16.79	0.0004	0.02	0.0002	0.351
Among populations within groups	20	54.17	0.0007	0.03	0.0003	0.76
Within populations	1437	3836.05	2.6695	99.96	0.0004	0.728
Total	1463	3907.01	2.6707