Table 4. Analysis of the molecular variance (AMOVA) for the COI and ANT genetic markers.

Source of variation	df	Sum of squares	Variance components	Variation (%)	P value	Fixation indices
a) COI
AMOVA without groups
Among populations without groups	16	63.536	0.17255 Va	41.59*	0.000	FST: 0.41589
Within populations	351	85.064	0.24235 Vb	58.41
Total	367	148.601	0.4149
AMOVA between basins
Among groups	3	19.279	0.03690 Va	8.67	0.055	FCT : 0.08673
Among populations within groups	13	44.257	0.14618 Vb	34.36*	0.000	FSC : 0.37624
Within populations	351	85.064	0.24235 Vc	56.97*	0.000	FST : 0.43034
Total	367	148.601	0.42543
b) ANT
AMOVA without groups
Among populations without groups	16	28.988	0.03892 Va	9.40*	0.000	FST: 0.09397
Within populations	613	230.022	0.37524 Vb	90.6
Total	629	259.01	0.41416
AMOVA between basins
Among groups	3	7.806	0.00670 Va	1.61	0.127	FCT : 0.01610
Among populations within groups	13	21.182	0.03412 Vb	8.20*	0.000	FSC : 0.08336
Within populations	613	230.022	0.37524 Vc	90.19*	0.000	FST : 0.09812
Total	629	259.01	0.41606

Analyses are presented for the total of populations without grouping, and pooling populations from the same oceanic basin together (Mediterranean, Atlantic, Pacific and Indian). Va, Vb and Vc are the associated covariance components. F_SC, F_ST and F_CT are the F-statistics.