Mating patterns and determinants of individual reproductive success in brown trout (Salmo trutta) revealed by parentage analysis of an entire stream living population
Mating patterns and determinants of individual reproductive success in brown trout (Salmo trutta) revealed by parentage analysis of an entire stream living population
复制标题
通过对整个溪流活体种群的亲子分析揭示了褐鳟（Salmo trutta）的交配模式和个体繁殖成功的决定因素
作者：
D. Serbezov;L. Bernatchez;E. M. Olsen;L. Vøllestad
繁殖成功及其决定因素是很难推断的野生种群的物种，没有父母的照顾，行为观察是困难或不可能的。在这项研究中，我们的特点是繁殖系统，并提供了一个详尽的采样流居民褐鳟鱼（萨尔莫trutta）人口在自然条件下的个人繁殖成功的估计。我们推断亲子关系使用全概率贝叶斯模型，结合遗传（微卫星）与表型数据。在大家庭有未抽样父母的情况下，通过从同胞关系分析中推断出的父母基因型来增加潜在父母文件，我们可以对家庭规模的方差进行更精确的推断。我们观察到一夫多妻制和一夫一妻制的交配和大的两性生殖偏斜，特别是在男性。相应地，我们发现了两性对体型大小的性选择的证据。我们发现，褐鳟鱼的交配系统有可能是非常灵活的，我们推测，环境的不确定性可能是推动进化，也许选择在这个物种的交配系统的可塑性的维护。
Reproductive success and its determinants are difficult to infer for wild populations of species with no parental care where behavioural observations are difficult or impossible. In this study, we characterized the breeding system and provide estimates of individual reproductive success under natural conditions for an exhaustively sampled stream‐resident brown trout (Salmo trutta) population. We inferred parentage using a full probability Bayesian model that combines genetic (microsatellite) with phenotypic data. By augmenting the potential parents file with inferred parental genotypes from sib‐ship analysis in cases where large families had unsampled parents, we could make more precise inference on variance of family size. We observed both polygamous and monogamous matings and large reproductive skew for both sexes, particularly in males. Correspondingly, we found evidence for sexual selection on body size for both sexes. We show that the mating system of brown trout has the potential to be very flexible and we conjecture that environmental uncertainty could be driving the evolution and perhaps select for the maintenance of plasticity of the mating system in this species.