Predator-prey interactions exert significant influence over the survival of juvenile fish cohorts. Therefore, susceptibility of a habitat to invasion is influenced by the capacity of native predators to regulate invasive species through consumption. Closely related predators often share similar characteristics (e.g., odors or body morphometry), and prey species capable of expressing generalized behavioral responses to predators with similar characteristics may increase their chances for survival. Here, we examined how naïve juvenile silver carp (Hypophthalmichthys molitrix), an invasive Asian carp, respond to three predator odors from predators commonly found in Midwestern lakes and rivers of the USA. We tested two congeneric species of bass (largemouth Micropterus salmoides and smallmouth M. dolomieu bass) and one outgroup, longnose gar (Lepisosteus osseus). Additionally, we tested how silver carp conditioned to recognize the odor of one group, largemouth bass, responded to the predator odors of the congeneric species and the outgroup. We found that juvenile silver carp showed no innate response to any of the three predator odors. Additionally, although they could be conditioned to recognize predator odors from largemouth bass, they were unable to generalize predator odors to smallmouth bass or longnose gar odor. These results suggest that invasive species could be less likely to persist in environments with diverse predator communities than environments of equal densities with uniform predator communities and that future studies should continue to explore this area as well as focus on understanding dynamics in predator-prey interactions of invasive species.

捕食者-猎物相互作用对幼鱼群的生存产生重大影响。因此，栖息地对入侵的易感性受到本地捕食者通过消费调节入侵物种的能力的影响。密切相关的捕食者通常具有相似的特征（例如，气味或身体形态测量），能够对具有相似特征的捕食者表达普遍行为反应的猎物物种可能会增加它们的生存机会。在这里，我们研究了幼年鲢鱼 ( Hypophthalmichthys molitrix )，一种入侵的亚洲鲤鱼，如何对来自美国中西部湖泊和河流中常见的捕食者的三种捕食者气味做出反应。我们测试低音两个同属种（大口黑口黑鲈和小嘴M. dolomieu bass) 和一只外群长鼻雀 ( Lepisosteus osseus)）。此外，我们测试了鲢鱼如何适应识别一组大口黑鲈的气味，对同类物种和外群体的捕食者气味做出反应。我们发现幼年鲢鱼对三种捕食者气味中的任何一种都没有表现出先天反应。此外，虽然他们可以适应从大口黑鲈中识别捕食者的气味，但他们无法将捕食者的气味概括为小口黑鲈或长鼻雀的气味。这些结果表明，与具有统一捕食者群落的同等密度环境相比，入侵物种在具有多样化捕食者群落的环境中生存的可能性更小，未来的研究应继续探索这一领域，并重点了解捕食者-猎物相互作用的动态。入侵物种。