Data from: Mating patterns and determinants of individual reproductive success in brown trout (Salmo trutta) revealed by parentage analysis of an entire stream living population

Reproductive success and its determinants are difficult to infer for wild populations of species with no parental care where behavioral observations are difficult or impossible. In this study, we characterized the breeding system and provide estimates of individual reproductive success under natural conditions for a stream-resident, semi-isolated brown trout (Salmo trutta) population. We inferred parentage using a full probability Bayesian model that combines genetic (microsatellite) with phenotypic data. We had tried to exhaustively sample all individuals from a population, including large sib-ship families from three consecutive offspring cohorts. This allowed us to make inferences about the parental genotypes that had produced these families, and thus to augment the parent file with the inferred parental genotypes in cases where large families had unsampled parents. We observed both polygamous and monogamous matings and large reproductive skew for both sexes, but particularly so in males. We found no impact of individual neutral genetic variation or between-partners genetic similarity on reproductive success. Combining parentage analysis with sib-ship reconstruction allows for more precise inference on variance of family sizes and more definite statements on the determinants of reproductive success.

对于无亲代抚育且行为观测难以开展或无法实施的物种野生种群而言，其繁殖成功率及其影响因子往往难以准确推断。本研究针对一个溪流定居型、半隔离的褐鳟（Salmo trutta）野生种群，明确了其繁殖系统，并估算了自然条件下个体的繁殖成功率。我们采用整合了遗传（微卫星，microsatellite）数据与表型数据的全概率贝叶斯模型开展亲权推断。研究团队对该种群的所有个体进行了穷尽式采样，涵盖了连续三个后代同生群中的大型同胞家系群。借此，我们得以推断产生这些家系群的亲本基因型，并在大型家系存在未采样亲本的案例中，通过推断得到的亲本基因型补充亲本数据集。我们观测到了多配制与单配制两种交配模式，且两性均存在显著的繁殖偏倚，其中雄性的繁殖偏倚尤为突出。研究未发现个体中性遗传变异或配偶间遗传相似度对繁殖成功率存在显著影响。将亲权分析与同胞家系重建相结合，能够更精准地推断家系大小的变异幅度，并更明确地阐释繁殖成功率的影响因子。