Table 1.

Pairwise genetic differentiation (F_ST) between sampling locations

	Miami	Woods Hole	Varna	Villefranche	Sylt
Miami	—	0.122	0.041	0.062	0.118
Woods Hole	0.159	—	0.118	0.207	0.014
Varna	0.059	0.154	—	0.030	0.113
Villefranche	0.086	0.226	0.045	—	0.196
Sylt	0.151	0.016	0.146	0.210	—

All values tested significantly different from zero (P < 0.001).

Differentiation calculated using 1,632,777 SNPs after filtering for linkage disequilibrium and a 80% call rate (upper diagonal) and using a reduced SNP set of 832,323 SNPs with a minimum allele frequency MAF > 0.05 (lower diagonal).