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Table 1 Information on Galápagos marine iguanas.

From: Progressive colonization and restricted gene flow shape island-dependent population structure in Galápagos marine iguanas (Amblyrhynchus cristatus)

Island Island Age (Myr) Population size estimates Population Microsatellite loci Mitochondrial Control Region (CR)
     N N alleles Hobs k-test N H Hd π K Fs D
Española 3.31-3.54 1,700-21,000 EPC (Punta Cevallos)a,b 99 9.07 0.79 7 (p = 0.46) 98 6 0.656 0.00193 2.271 2.65 -1.20
Fernandina 0.04 15,000-120,000 FCH (Capo Hammond)a 28 9.5 0.72 9 (p = 0.11) 20 10 0.900 0.00281 3.311 -2.35 -0.80
    FPE (Punta Espinosa)a,b 99 11.6 0.78 8 (p = 0.25) 86 27 0.946 0.00332 3.911 -11.40** -0.55
    FPM (Punta Mangle)a,b 78 10.7 0.79 10* (p = 0.037) 73 32 0.950 0.00328 3.872 -20.84** -1.48*
Floreana 1.52-2.34 2,000-16,000 FMO (Punta Montura)a,b 51 8.7 0.78 6 (p = 0.67) 60 12 0.786 0.00423 4.983 0.98 0.18
Genovesa 0.35 900-15,000 GCA (Campamente)a,b 92 6.7 0.70 6(p = 0.67) 81 5 0.574 0.00299 3.021 6.26 0.48
Isabela 0.313-535 5,000-40,000 IBU (Bahia Urvina)b 17 8.9 0.79 8(p = 0.25) 15 10 0.924 0.00367 4.324 -2.65 -0.49
    IWE (Cabo West)b - - - - 13 5 0.628 0.00137 1.615 -0.58 -1.45
    ICB (Caleta Black)a - - - - 7 7 1.000 0.00364 4.286 -3.40* -1.05
    ICW (Caleta Webb)a,b 40 10 0.74 8(p = 0.25) 30 8 0.724 0.00333 3.922 1.02 0.64
    IBA (Cerro Ballena)b 22 9.1 0.76 8(p = 0.25) 21 4 0.271 0.00078 0.914 -0.16 -1.72*
    IPA (Punta Albemarle)a,b 61 9.4 0.77 7(p = 0.46) 54 7 0.681 0.00337 3.969 3.42 0.62
Marchena 0.56 1,000-10,000 MBN 1993 (Bahia Negra) 30 7.7 0.76 5(p = 0.84) 29 4 0.685 0.00324 3.823 5.37 1.60
    MBN 2004 (Bahia Negra) 49 7.7 0.78 7(p = 0.46) 49 2 0.250 0.00212 2.500 8.57 0.33
Pinta 0.70 800-6,000 PCI (Caleta Ibetson)a,b 94 6.1 0.64 6(p = 0.67) 94 6 0.431 0.00118 1.388 0.63 0.42
Pinzón 1.40-1.73 200-900 PDL (Dumb Landing)a 9 5.9 0.76 7(p = 0.46) 12 4 0.682 0.00084 0.985 -0.65 -0.90
Rábida 1.06-1.56 200-2,000 RAB (No name)b 10 5.1 0.71 7(p = 0.46) 11 3 0.473 0.00308 3.756 4.00 -0.14
San Cristóbal 2.35-4.04 50-400 SRL (Loberia)a,b 82 6.3 0.70 4(p = 0.94) 83 3 0.616 0.00220 2.589 7.53 2.67
    SRP (Punta Pitt)a 20 3.9 0.51 5(p = 0.84) 20 1 0.000 0.00000 0.000 NA NA
Santa Cruz 1.31-2.26 2,000-13,000 SCZ (Estacion/Camaño)a,b 135 9.5 0.80 7(p = 0.46) 116 2 0.017 0.00007 0.086 -0.56 -1.89
Santa Fé 2.85 3,000-16,000 SFN (North)a 52 8.4 0.80 8(p = 0.25) 52 4 0.587 0.00079 0.932 0.72 0.12
    SFM (Miedo)a,b 82 8.5 0.75 9(p = 0.11) 82 6 0.702 0.00283 3.341 4.53 2.18
    SFX (Bahia Paraiso)b 24 8.4 0.80 7(p = 0.46) 25 5 0.643 0.00175 2.067 1.14 0.43
Santiago 0.77-1.42 450-4,000 SJB (James Bay)a,b 51 7.7 0.76 10*(p = 0.037) 72 3 0.547 0.00607 7.160 18.49 3.81
Overall   37,000-280,000   1225     1203 106      
  1. Population localities, sample sizes, island ages, and summary data for 13 microsatellite loci and the mitochondrial control region (CR).
  2. Island ages are in millions of years (myr) and were derived from plate velocity and potassium-argon (KAr) dating estimates from multiple sources [3, 17, 82, 86, 87]. Estimates of population sizes were compiled in [78]. Microsatellite loci data: N, sample size for each population; N alleles , average number of alleles; Hobs, observed heterozygosity; intra-locus k-test statistic, number of loci out of 13 loci that showed negative k values and the corresponding p value (specific k values are provided by suppl. table 3). Control Region data: N, sample size for each population; H, number of haplotypes; Hd, haplotype diversity;, nucleotide diversity; K, average number of nucleotide differences between sequences; FS, Fu's neutrality statistic [51]; D, Tajima's neutrality statistic [52]. For the complete table: * and ** denote significance at the = 0.05 and = 0.01 levels respectively. Populations were sampled in 1991/1993aand/or 2004b.