DOI: 10.5061/dryad.jp1f0n5
title: Data from: Evidence for dominant males but not choosy females in an insular rock iguana

description: In natural populations susceptible to inbreeding depression, behaviors
 such as female promiscuity and disassortative mating may enhance the
 production of outbred progeny and help maintain genetic variation at the
 population-level. However, empirical tests of such hypotheses have largely
 focused on mating systems in which female choice is known to play a large
 role. In insular reptile populations, cryptic choice may be important for
 overcoming constraints on precopulatory choice and diversifying breeder
 representation. We carried out pedigree reconstructions of 50 clutches of
 critically endangered Cyclura nubila caymanensis (Sauria: Iguanidae) to
 investigate the prevalence and efficacy of strategies theorized to
 optimize genetic compatibility among mate pairs. We found that females
 mating disassortatively and multiply, but not with respect to male
 heterozygosity, tended to produce more heterozygous offspring on average.
 Pair relatedness also had a negative effect on hatching success, while
 additional sires positively influenced clutch size. Despite evidence for
 direct and indirect benefits, females did not mate with more outbred or
 genetically dissimilar males than expected by chance. Our data imply
 strong reproductive skew among males, with geographic proximity and body
 size largely predicting siring success. Multiple-paternity occurred in a
 minimum of 38% of clutches. Paradoxically, females were not more
 promiscuous when confronted with more males, as demonstrated at a site
 supporting high local densities. Our data imply that while female mating
 behaviors have the potential to confer adaptive benefits in this small
 population, the trajectory of mating system evolution may be largely
 constrained by sexual conflict.
description: Candidate Adult
 Microsatellite Genotypes and MorphometricsGenotypes (14
 microsatellite loci) and morphological measurements (SVL, mass, and head
 measurements) of candidate adult C. nubila caymanensis sampled on Little
 Cayman. Sex and identities of clutches dammed/sired are
 specified.Dryad-Adult Candidate
 Microsatellite Genotypes and
 Morphometrics.xlsxOffspring Microsatellite
 Genotypes and MorphometricsGenotypes (14
 microsatellite loci) and morphological measurements (SVL and mass) of
 hatchling C. nubila caymanensis sampled on Little Cayman. Clutch identity
 is specified.Dryad-Offspring Microsatellite
 Genotypes and Morphometrics.xlsxDyadic Relatedness of
 Adult CandidatesRelatedness of pairs of
 individuals calculated using seven estimators implemented in COANCESTRY.
 All pairwise comparisons are considered.Dyadic Relatedness Adult
 Candidates.xlsxF and MLH Estimates
 Adult CandidatesTwo estimators of
 inbreeding coefficient (F) and three estimators of multi-locus
 heterozygosity (MLH) - standardized heterozygosity (SH), internal
 relatedness (IR) and homozygosity by locus (HL) - calculated from the
 genotypes of all adult candidates using COANCESTRY and the R package,
 'Rhh,' respectively.F and MLH Estimaes of
 HatchlingsTwo estimators of
 inbreeding coefficient (F) and three estimators of multi-locus
 heterozygosity (MLH) - standardized heterozygosity (SH), internal
 relatedness (IR) and homozygosity by locus (HL) - calculated from the
 genotypes of all hatchlings using COANCESTRY and the R package,
 'Rhh,' respectively.