Table 1 Summary statistics and neutrality test statistics for each island deme shown in Figure

Region	Archipelago	Island	Neritina canalis					Neripteron dilatatus
			n	No. of haps	h	π	F_S	n	No. of haps	h	π	F_S
West Pacific	Vanuatu	Espiritu Santo						19	12	0.871	0.009	−3.13
		Efate						23	18	0.941	0.007	−12.76
		Tanna	6	6	1.000	0.004	−2.86
	Fiji	Viti Levu	17	15	0.985	0.008	−9.95	2	2	1.000	0.012	NA
		Taveuni	13	10	0.970	0.005	−5.05	23	20	0.976	0.013	−11.60
	Samoa	Upolu	22	17	0.935	0.005	−14.85	23	17	0.937	0.007	−11.02
		Tutuila	24	19	0.968	0.005	−19.76	19	11	0.889	0.008	−2.52
Central Pacific	Society Islands	Raiatea	17	11	0.912	0.005	−6.11	24	16	0.960	0.008	−7.16
		Huahine	18	14	0.967	0.007	−8.73
		Moorea	25	20	0.970	0.005	−21.20	18	15	0.978	0.011	−7.70
		Tahiti	18	15	0.961	0.006	−11.98
	Marquesas	Nuku Hiva	23	13	0.921	0.006	−5.07
		Hiva Oa	19	12	0.924	0.006	−5.53

Abbreviation: NA, not applicable.
Haplotype diversity (h), nucleotide diversity (π) and F_s (Fu, 1997) calculated using Arlequin 3.1 (Excoffier et al., 2005). Significant values of F_s (P<0.02) are shown in bold.

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