Mating systems and predictors of relative reproductive success in a Cutthroat Trout subspecies of conservation concern

The genetic data set provided was generated via sampling of Yellowstone Cutthroat Trout at a weir on a spawning tributary (Burns Creek) of the South Fork Snake River, Idaho, USA. Each migrating adult was sampled for a genetic sample and the length and date of sampling was recorded for each individual. Juveniles emigrating from the same system later the same year were also sampled for genetics. In the lab, DNA was extracted and each individual was amplified at a panel of 134 single nucleotide polymorphisms (SNPs) using a Genotyping-in-Thousands (GT-seq) protocol. Parentage analysis was performed using the algorithms implemented in SNPPIT, specifically juveniles were assigned to parent-pairs. We created reproductive profiles for each adult including the number of offspring assigned, number of mates. Analysis of genetic mating systems involved summarizing the means and variances of reproductive success (offspring assigned) and mating success (number of mates) for each sex. We compared phenotypic traits of fish that did and did not mate to test for evidence of sexual selection.