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、且行为观察难以开展甚至无法进行的物种野生种群而言，其繁殖成功率及其决定因素很难被准确推断。本研究针对一个溪流栖居、半隔离的褐鳟（Salmo trutta）野生种群，对其繁殖系统进行了系统刻画，并估算了自然条件下个体的繁殖成功率。本研究采用整合了遗传（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。研究团队对该种群内所有个体进行了全面采样，涵盖了来自三个连续同龄后代群的大型同胞家系。这使得我们能够推断产生这些家系的亲本基因型，并在大型家系存在未采样亲本的情况下，通过推断得到的亲本基因型扩充亲本数据集。本研究观察到多配制与单配制两种交配模式，且雌雄个体均存在显著的繁殖偏倚，其中雄性的繁殖偏倚尤为突出。本研究未发现个体中性遗传变异或配偶间遗传相似性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方差，并更明确地阐明繁殖成功率的决定因素。