Out-of-the tropics or trans-tropical dispersal? The origins of the disjunct distribution of the gooseneck barnacle Pollicipes elegans

Table 1 Molecular diversity and neutrality tests at the cytochrome c oxidase mitochondrial gene in populations of Pollicipes elegans

Population	Location	n	Hap	π ± SD	H ± SD	k ± SD	S	R ₂ (P)	Tajima’s D (P)	Fu’s F _S (P)
MEX1	Gaspareño, Mexico	25	21	0.006 ± 0.004	0.983 ± 0.017	3.713 ± 1.958	27	0.0754 (0.036)	-1.784 (0.016)	-18.585 (0.000)
MEX2	Migriño, Mexico	21	15	0.005 ± 0.003	0.938 ± 0.040	2.924 ± 1.611	25	0.0753 (0.013)	-2.217 (0.006)	-10.107 (0.000)
MEX3	Melaque, Mexico	24	21	0.008 ± 0.004	0.978 ± 0.024	4.486 ± 2.311	37	0.0396 (0.000)	-2.091 (0.007)	-17.272 (0.000)
SAL1	Mizata, El Salvador	25	19	0.010 ± 0.006	0.970 ± 0.022	5.880 ± 2.940	30	0.0827 (0.080)	-0.972 (0.151)	-9.086 (0.000)
SAL2	Taquillo, El Salvador	15	13	0.011 ± 0.006	0.981 ± 0.031	6.400 ± 3.249	24	0.1062 (0.116)	-0.552 (0.296)	-5.275 (0.012)
SAL3	Jucuarán, El Salvador	31	19	0.008 ± 0.005	0.942 ± 0.025	4.976 ± 2.513	29	0.0733 (0.061)	-1.127 (0.135)	-7.804 (0.003)
PER1	El Arco, Peru	20	14	0.007 ± 0.004	0.889 ± 0.068	4.237 ± 2.217	22	0.0811 (0.026)	-1.214 (0.890)	-6.080 (0.003)
PER2	Islilla, Peru	27	13	0.006 ± 0.004	0.889 ± 0.041	3.527 ± 1.870	16	0.1012 (0.274)	-0.522 (0.343)	-3.840 (0.042)

n, number of diploid individuals; Hap, number of haplotypes, π, nucleotide diversity; SD, standard deviation; H, haplotype diversity; k, number of haplotypes; S, number of segregation sites; R ₂, Ramos-Onsins and Rozas index; Tajima’s D; Fu’s F _S statistic. Significant departures from the null model of neutrality or population growth are shown in boldface; (P), p-value associated to neutrality tests

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