Table S2.

Diversity indices for each genetic cluster and location

Group	N	S	S/n	p	D	HO	HE
All individuals	282	2,388	0.017809	0.000702	−2.38109	0.164 ± 0.001	0.165 ± 0.001
North Sea	39	1,194	0.008904	0.000682	−2.55115	0.162 ± 0.003	0.166 ± 0.003
Pelagic	117	1,653	0.012328	0.000572	−2.53157	0.166 ± 0.003	0.164 ± 0.003
Demersal	128	1,695	0.01264	0.000661	−2.39161	0.162 ± 0.003	0.164 ± 0.003
Kattegat	20	834	0.006219	0.000652	−2.63035	0.163 ± 0.003	0.166 ± 0.003
Barsebäck	22	963	0.007182	0.00071	−2.63197	0.161 ± 0.003	0.166 ± 0.003
Dabki	24	898	0.006697	0.00063	−2.62902	0.163 ± 0.003	0.164 ± 0.003
Gdynia	23	812	0.006055	0.000562	−2.68268	0.167 ± 0.003	0.164 ± 0.003
Bornholm	22	721	0.005378	0.000458	−2.83613	0.171 ± 0.004	0.163 ± 0.003
Latvian sea	24	838	0.00625	0.00054	−2.74487	0.166 ± 0.003	0.164 ± 0.003
Irbe (Pelagic)	9	485	0.003617	0.000575	−2.96216	0.162 ± 0.004	0.165 ± 0.004
Irbe (Demersal)	14	687	0.005123	0.000626	−2.76915	0.165 ± 0.004	0.164 ± 0.003
Öland	24	960	0.007159	0.000699	−2.57396	0.161 ± 0.003	0.164 ± 0.003
Kvädöfjärden	23	942	0.007025	0.000712	−2.55571	0.159 ± 0.003	0.164 ± 0.003
Helsinki	21	822	0.00613	0.000582	−2.73057	0.168 ± 0.004	0.165 ± 0.003
Hanko	22	882	0.006577	0.000682	−2.55878	0.161 ± 0.003	0.164 ± 0.003
Åland	24	935	0.006972	0.000657	−2.62673	0.166 ± 0.003	0.166 ± 0.003

D, Tajima’s D; H_E, expected heterozygosity; H_O, observed heterozygosity; n, total number of sites; N, number of samples; p, nucleotide diversity; S, number of segregating sites.