Nakayama Shinnosuke, Rapp Tobias, Arlinghaus Robert
Division of Integrative Fisheries Management, Faculty of Life Sciences, Humboldt-Universität zu Berlin, Berlin, 10115, Germany.
Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, 12587, Germany.
J Anim Ecol. 2017 Mar;86(2):192-201. doi: 10.1111/1365-2656.12603. Epub 2016 Nov 14.
Fast and slow life histories are proposed to covary with consistent individual differences in behaviour, but little is known whether it holds in the wild, where individuals experience natural fluctuations of the environment. We investigated whether individual differences in behaviour, such as movement traits and prey selection, are linked to variation in life-history traits in Eurasian perch (Perca fluviatilis) in the wild. Using high-resolution acoustic telemetry, we collected the positional data of fish in a whole natural lake and estimated individual movement traits by fitting a two-state correlated random walk model. Prey selection was inferred from stable isotope analysis using scale samples. Life-history traits were estimated by fitting a biphasic growth model to an individual growth trajectory back-calculated from scale samples. Life-history traits were correlated with behavioural traits such as movements and prey selection. Individuals with higher reproductive effort were found to switch more frequently between active and inactive modes and show greater reliance on prey from pelagic pathways (indicated by lower δ C). Further, individuals with faster juvenile growth were found to stay active for a longer time during the adult stage. Our results demonstrate the link between individual behavioural differences and fast-slow life-history traits under ecologically relevant conditions.
快速和慢速生活史被认为与个体行为上持续存在的差异共同变化，但对于在野外个体经历环境自然波动的情况下这一观点是否成立却知之甚少。我们调查了在野外，欧亚鲈（河鲈）的行为个体差异，如运动特征和猎物选择，是否与生活史特征的变化相关。利用高分辨率声学遥测技术，我们收集了整个天然湖泊中鱼类的位置数据，并通过拟合双态相关随机游走模型来估计个体运动特征。猎物选择是通过对鳞片样本进行稳定同位素分析推断出来的。生活史特征是通过将双相生长模型拟合到从鳞片样本反推的个体生长轨迹来估计的。生活史特征与运动和猎物选择等行为特征相关。我们发现，繁殖投入较高的个体在活跃和不活跃模式之间切换得更频繁，并且对来自中上层途径的猎物表现出更大的依赖（以较低的δC表示）。此外，我们还发现，幼鱼生长较快的个体在成年阶段保持活跃的时间更长。我们的研究结果证明了在生态相关条件下个体行为差异与快速 - 慢速生活史特征之间的联系。
