Mating systems and patterns of reproductive success in fishes play an important role in ecology and evolution. While information on the reproductive ecology of many anadromous salmonids (Oncorhynchus spp.) is well detailed, there is less information for nonanadromous species including the Yellowstone Cutthroat Trout (O. clarkii bouvieri), a subspecies of recreational angling importance and conservation concern. Using data from a parentage-based tagging study, we described the genetic mating system of a migratory population of Yellowstone Cutthroat Trout, tested for evidence of sexual selection, and identified predictors of mating and reproductive success. The standardized variance in mating success (i.e., opportunity for sexual selection) was significantly greater for males relative to females, and while the relationship between mating success and reproductive success (i.e., Bateman gradient) was significantly positive for both sexes, a greater proportion of reproductive success was explained by mating success for males (r² = 0.80) than females (r² = 0.59). Overall, the population displayed a polygynandrous mating system, whereby both sexes experienced variation in mating success due to multiple mating, and sexual selection was variable across sexes. Tests for evidence of sexual selection indicated the interaction between mating success and total length best-predicted relative reproductive success. We failed to detect a signal of inbreeding avoidance among breeding adults, but the group of parents that produced progeny were on average slightly less related than adults that did not produce progeny. Lastly, we estimated the effective number of breeders (N_b) and effective population size (N_e) and identified while N_b was lower than N_e, both are sufficiently high to suggest Yellowstone Cutthroat Trout in Burns Creek represent a genetically stable and diverse population.

中文翻译：

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受保护的切喉鳟鱼亚种的交配系统和相对繁殖成功率的预测因素

鱼类的交配系统和繁殖成功模式在生态和进化中发挥着重要作用。虽然许多溯河产卵鲑鱼（ Oncorhynchus spp.）的生殖生态学信息非常详细，但有关非溯河产卵物种的信息却较少，包括黄石切喉鳟（O. clarkii bouvieri），这是一种具有休闲钓鱼重要性和保护问题的亚种。利用基于亲缘标记研究的数据，我们描述了黄石鳟鱼迁徙种群的遗传交配系统，测试了性选择的证据，并确定了交配和繁殖成功的预测因子。相对于雌性，雄性的交配成功率（即性选择机会）的标准化方差显着更大，并且虽然交配成功率和繁殖成功率（即贝特曼梯度）之间的关系对于两性均显着呈正相关，但雄性的比例更大。繁殖成功率的解释是雄性 ( r ²  = 0.80) 的交配成功率高于雌性 ( r ²  = 0.59)。总体而言，该群体表现出一夫多妻制的交配系统，由于多次交配，两性的交配成功率存在差异，并且性选择在不同性别之间也存在差异。性选择证据的测试表明交配成功与总长度最佳预测的相对繁殖成功之间的相互作用。我们未能在繁殖的成虫中检测到避免近交的信号，但产生后代的父母群体的相关性平均略低于不产生后代的成虫。最后，我们估计了有效育种者数量 ( N _b ) 和有效种群规模 ( Ne ₎并确定，当N _b低于Ne时，两者都足够高，表明伯恩斯溪的黄石切喉鳟鱼代表了遗传稳定和多样化的种群_。人口。