Metadata associated with ‘Garrick_etal_2014_MEC_Dryad.xls’ Sheet 1: Cbecki_pure_PBL Spatial coordinates (decimal degrees), sex [male (M), female (F), or juvenile(J)], nuclear microsatellite genotypes (12 loci) and mitochondrial DNA control region seqeunces (~705-bp) for 80 Chelonoidis becki tortoises classified as PBL puerbreds, sampled from Isabela Island. Microsatellite allele sizes are in base pairs, and '-9' indicates missing data. Missing information for other data types is represented by '?'. Sheet 2: Cbecki_pure_PBR Spatial coordinates (decimal degrees), sex [male (M), female (F), or juvenile(J)], nuclear microsatellite genotypes (12 loci) and mitochondrial DNA control region seqeunces (~705-bp) for 199 Chelonoidis becki tortoises classified as PBR puerbreds, sampled from Isabela Island. Microsatellite allele sizes are in base pairs, and '-9' indicates missing data. Missing information for other data types is represented by '?'. Sheet 3: Cbecki_f1 Spatial coordinates (decimal degrees), sex [male (M), female (F), or juvenile(J)], nuclear microsatellite genotypes (12 loci) and mitochondrial DNA control region seqeunces (~705-bp) for 117 Chelonoidis becki tortoises classified as first generation (F1) hybrids, sampled from Isabela Island. Microsatellite allele sizes are in base pairs, and '-9' indicates missing data. Missing information for other data types is represented by '?'. Sheet 4: Cbecki_bcross_PBRxf1 Spatial coordinates (decimal degrees), nuclear microsatellite genotypes (12 loci) and mitochondrial DNA control region seqeunces (~705-bp) for 293 Chelonoidis becki tortoises classified as PBR × F1 backcrosses, sampled from Isabela Island. Microsatellite allele sizes are in base pairs, and '-9' indicates missing data. Missing information for other data types is represented by '?'. Sheet 5: Cbecki_bcross_PBLxf1 Spatial coordinates (decimal degrees), nuclear microsatellite genotypes (12 loci) and mitochondrial DNA control region seqeunces (~705-bp) for 152 Chelonoidis becki tortoises classified as PBL × F1 backcrosses, sampled from Isabela Island. Microsatellite allele sizes are in base pairs, and '-9' indicates missing data. Missing information for other data types is represented by '?'. Sheet 6: Cdarwni Nuclear microsatellite genotypes (12 loci) and mitochondrial DNA control region seqeunces (~705-bp) for 35 Chelonoidis darwini tortoises sampled from Santiago Island. Microsatellite allele sizes are in base pairs, and '-9' indicates missing data. Missing information for other data types is represented by '?'.