Table 1. Sampling groups and basic statistics.
| Id | Cluster analysis | Location | Latitude | Longitude | Year | No of samples | He | Ho | Fis | Ne (95% upper–lower limits) | Allelic richness | Mean maf at polymorphic loci |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FRA-1 | ATL-1 | Noirmoutier | -2.170 | 46.989 | 2003 | 22 | 0.151 | 0.134 | 0.085 | ∞ (4255.9 - ∞) | 1.716 | 0.143 |
| SPA-1 | ATL-2 | Vigo | -8.953 | 41.831 | 2009 | 13 | 0.145 | 0.136 | 0.036 | ∞ (∞—∞) | 1.598 | 0.168 |
| SPA-2 | ATL-3 | Cadiz | -6.400 | 36.500 | 2001 | 17 | 0.151 | 0.142 | 0.044 | ∞ (884.3 - ∞) | 1.672 | 0.154 |
| SPA-3 | WMED-1 | Alicante | -0.317 | 38.286 | 2009 | 20 | 0.143 | 0.124 | 0.082 | ∞ (∞—∞) | 1.654 | 0.149 |
| SPA-4 | WMED-2 | Valencia | -0.100 | 39.500 | 2014 | 24 | 0.154 | 0.138 | 0.073 | ∞ (1821.4 - ∞) | 1.745 | 0.142 |
| SPA-5 | WMED-3 | Balearic | 2.681 | 39.403 | 2013 | 36 | 0.156 | 0.142 | 0.075 | ∞ (9959.9 - ∞) | 1.816 | 0.131 |
| ITA-1 | WMED-4 | W Sardinia | 8.402 | 39.826 | 2002 | 28 | 0.156 | 0.142 | 0.067 | 11201.3 (1418.9 - ∞) | 1.779 | 0.136 |
| ITA-2 | WMED-5 | Genova | 8.901 | 44.360 | 2005 | 33 | 0.153 | 0.133 | 0.092 | 1466.5 (806.1–7809.2) | 1.779 | 0.136 |
| ITA-3 | WMED-6 | Sabaudia | 12.624 | 41.406 | 2013 | 52 | 0.156 | 0.141 | 0.068 | 1802.2 (1165.4–3935.5) | 1.870 | 0.122 |
| ITA-4 | WMED-7 | Tortoli | 9.756 | 39.924 | 2002 | 29 | 0.155 | 0.141 | 0.070 | ∞ (∞—∞) | 1.796 | 0.133 |
| ITA-5 | WMED-8 | Trapani | 12.449 | 38.006 | 2007 | 22 | 0.156 | 0.142 | 0.058 | 2606.9 (806.4 - ∞) | 1.739 | 0.145 |
| TUN-1 | WMED-9 | Tunis | 10.602 | 36.932 | 2014 | 106 | 0.154 | 0.133 | 0.105 | 14005.3 (4490.2 - ∞) | 1.931 | 0.112 |
| ITA-6 | WMED-10 | Otranto | 18.532 | 40.360 | 2001 | 20 | 0.154 | 0.146 | 0.033 | 106.4 (94.4–121.7) | 1.686 | 0.155 |
| ITA-7 | ION-1 | Venice | 12.409 | 45.322 | 2014 | 40 | 0.141 | 0.120 | 0.103 | ∞ (6425.9 - ∞) | 1.738 | 0.130 |
| GRE-1 | ION-2 | Ionio | 20.360 | 38.983 | 2014 | 31 | 0.155 | 0.149 | 0.037 | 1660.1 (859.5–21727.1) | 1.789 | 0.136 |
| GRE-2 | ION-3 | Igoumenitsa | 20.163 | 39.486 | 2006 | 53 | 0.155 | 0.139 | 0.076 | 7102.4 (2242.4 - ∞) | 1.854 | 0.124 |
| GRE-3 | ION-4 | Mesologgi | 21.315 | 38.303 | 2005 | 49 | 0.155 | 0.138 | 0.087 | ∞ (∞—∞) | 1.852 | 0.124 |
| GRE-4 | ION-5 | Korinthiakos | 22.945 | 37.270 | 2013 | 32 | 0.156 | 0.140 | 0.080 | 3157.6 (1173.6 - ∞) | 1.794 | 0.136 |
| GRE-5 | AEG-1 | Nayplio | 22.758 | 38.046 | 2005 | 33 | 0.156 | 0.140 | 0.078 | ∞ (∞—∞) | 1.790 | 0.136 |
| GRE-6b | AEG-2 | Basova Kavalas | 24.495 | 40.846 | 2006 | 49 | 0.155 | 0.137 | 0.091 | 2235.5 (1334.9–6767.1) | 1.854 | 0.124 |
| GRE-6 | AEG-3 | Basova Kavalas | 24.495 | 40.846 | 2013 | 30 | 0.151 | 0.137 | 0.071 | ∞ (∞—∞) | 1.753 | 0.138 |
| GRE-7b | AEG-4 | Thermaikos gulf | 22.846 | 40.263 | 2004 | 36 | 0.156 | 0.137 | 0.083 | 288.6 (255.6–331) | 1.798 | 0.134 |
| GRE-7 | AEG-5 | Thermaikos gulf | 22.846 | 40.263 | 2013 | 45 | 0.155 | 0.137 | 0.090 | ∞ (9787.2 - ∞) | 1.840 | 0.126 |
| GRE-8 | AEG-6 | Agiasma | 24.419 | 40.644 | 2005 | 43 | 0.157 | 0.140 | 0.071 | 6179 (1991.7 - ∞) | 1.826 | 0.131 |
| GRE-9b | AEG-7 | Alexandroupolis | 25.916 | 40.778 | 2005 | 47 | 0.154 | 0.139 | 0.078 | 29303.4 (2833.1 - ∞) | 1.832 | 0.127 |
| GRE-9 | AEG-8 | Alexandroupolis | 25.916 | 40.778 | 2013 | 46 | 0.155 | 0.138 | 0.087 | ∞ (4241.3 - ∞) | 1.836 | 0.127 |
| Mean | 36.8 | 0.153 | 0.138 | 0.074 | - | 1.782 | 0.135 |
Id refers to the sampling country; Cluster analysis refers to the results of Structure and AMOVA analysis suggesting a subdivision of samples in four main groups (ATLantic, West MEDiterranean Sea, IONian Sea and AEGean Sea); He: Expected heterozygosity; Ho: Observed heterozygosity; Fis: Fixation index; Ne: Effective population size; Mean maf at polymorphic loci: Average minimum allele frequency at polymorphic loci.