Individual traits responding to predation cues are widespread in many aquatic and terrestrial organisms. However, linking individual traits to population dynamics in response to predation cues is poorly understood despite its important role in shaping ecosystems. In this study, we investigated the individual traits associated with population dynamics of Daphnia mitsukuri in response to two different cues from fish predation. Two clones of D. mitsukuri were reared under alarm signal, kairomone, and their combination treatment until the populations reached maximum abundances. Individual inducible traits, grazing rates, and population parameters were recorded for the growing populations. Our data showed the population dynamics were highly correlated with the individual traits, and some mechanical correlations were discussed in the present study. Specifically, in the combination treatment, the decreased individual size contributed to enhancing the individual grazing rate at a high population density, which ultimately resulted in a higher (75%) maximum population density compared to the control. Besides, diversified links between individual traits and population dynamics were observed in different clones, especially in dormant egg production. In summary, inducible changes in individual morphological characteristics and life history traits were associated with variation in population dynamics of Daphnia in response to cues from predation. This study is helpful to understand the effects of signals of predation risk on the individual and population levels.

对捕食线索有反应的个体性状在许多水生和陆地生物中普遍存在。然而，尽管它在塑造生态系统中起着重要作用，但人们对于将各种个体特征与种群动态联系起来以响应捕食线索却知之甚少。在这项研究中，我们调查了与水蚤水蚤种群动态有关的个体性状，以响应鱼类捕食的两种不同提示。D的两个克隆。光寿在警报信号，海洛酮及其联合治疗下进行饲养，直到种群达到最大丰度。记录了不断增长的种群的个体诱导性状，放牧率和种群参数。我们的数据显示种群动态与个体性状高度相关，并且在本研究中讨论了一些机械相关性。具体地，在组合处理中，个体尺寸的减小有助于在高种群密度下提高个体放牧率，这最终导致与对照相比更高的最大种群密度（75％）。此外，在不同的克隆中，尤其是在休眠的产卵过程中，个体性状与种群动态之间存在着多种联系。综上所述，水蚤对捕食线索的反应。这项研究有助于了解捕食风险信号对个人和人口水平的影响。