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Table 1 Genetic diversity measures in Pachygrapsus marmoratus from four sampling sites in the Ligurian Sea. For each site, the GPS coordinates and N, number of analysed individuals, are reported. NA, number of alleles; AR, allelic richness; AP, number of private alleles; HO, observed heterozygosity; He, expected unbiased heterozygosity. Means ± SE values. *, P < 0.005 (after Bonferroni correction)

From: Investigation of mechanisms underlying chaotic genetic patchiness in the intertidal marbled crab Pachygrapsus marmoratus (Brachyura: Grapsidae) across the Ligurian Sea

  Locus 79 109 101 108 183 99 16 187 84 6 Overall
Porto Mediceo (PM) NA 2 40 17 5 14 20 35 16 2 11 16.2 ± 4.08
43.549 N, 10.294 E AR 2.00 38.63 16.94 4.83 13.18 19.88 34.83 15.44 2.00 10.71 15.84 ± 3.99
  AP 0.00 2.00 0.00 0.00 1.00 2.00 7.00 1.00 0.00 0.00 13
N = 80 HO 0.49 0.95 0.92 0.63 0.71 0.96 0.99 0.58 0.37 0.62 0.72
  He 0.50 0.96 0.87 0.64* 0.69 0.91 0.87 0.59 0.32 0.60 0.70
Secche della Meloria (SM) NA 3 35 26 10 16 23 27 22 3 15 18.0 ± 3.37
43.546 N, 10.218 E AR 2.87 34.90 25.10 9.61 15.27 22.72 26.78 21.10 2.86 14.52 17.57 ± 3.31
  AP 0.00 2.00 0.00 1.00 1.00 2.00 4.00 3.00 1.00 1.00 15
N = 81 HO 0.53 0.99 0.89 0.68 0.79 0.96 0.97 0.77 0.41 0.73 0.77
  He 0.56 0.95 0.90 0.71 0.75 0.90 0.84 0.75 0.40 0.69 0.75
Riomaggiore (RM) NA 3 39 27 9 13 26 30 17 2 15 18.1 ± 3.84
44.096 N, 9.739 E AR 2.86 37.46 26.77 8.59 12.52 25.48 29.94 16.53 2.00 14.49 17.66 ± 3.75
  AP 0.00 1.00 3.00 1.00 0.00 1.00 1.00 1.00 0.00 2.00 10
N = 80 HO 0.53 0.99 0.93 0.61 0.73 0.97 0.99 0.71 0.28 0.74 0.75
  He 0.50 0.96 0.92* 0.66 0.75 0.93 0.83 0.69 0.28 0.75 0.73
Le Grazie (LG) NA 3 37 24 10 13 26 29 17 2 14 17.5 ± 3.60
44.067 N, 9.841 E AR 2.87 36.01 23.76 9.49 12.60 25.31 28.89 17.00 2.00 13.32 17.12 ± 3.54
  AP 0.00 0.00 0.00 1.00 0.00 2.00 3.00 1.00 0.00 3.00 10
N = 80 HO 0.52 0.96 0.96 0.62 0.80 0.96 0.97 0.67 0.41 0.74 0.76
  He 0.55 0.96 0.89 0.68* 0.80 0.91 0.83 0.68 0.41 0.73 0.74