PDF(Pubmed)
Abstract：
Collective motion is common across all animal taxa, from swarming insects to schools of fish. The collective motion requires intricate behavioral integration among individuals, yet little is known about how evolutionary changes in brain morphology influence the ability for individuals to coordinate behavior in groups. In this study, we utilized guppies that were selectively bred for relative telencephalon size, an aspect of brain morphology that is normally associated with advanced cognitive functions, to examine its role in collective motion using an open-field assay. We analyzed high-resolution tracking data of same-sex shoals consisting of 8 individuals to assess different aspects of collective motion, such as alignment, attraction to nearby shoal members, and swimming speed. Our findings indicate that variation in collective motion in guppy shoals might not be strongly affected by variation in relative telencephalon size. Our study suggests that group dynamics in collectively moving animals are likely not driven by advanced cognitive functions but rather by fundamental cognitive processes stemming from relatively simple rules among neighboring individuals.
摘要：
集体运动在所有动物类群中都很常见，从成群的昆虫到成群的鱼群。集体运动需要个体之间复杂的行为整合，然而，关于大脑形态的进化变化如何影响个体协调群体行为的能力知之甚少。在这项研究中,我们利用选择性繁殖的孔雀鱼相对端脑大小，大脑形态的一个方面，通常与高级认知功能有关，使用开放场测定法检查其在集体运动中的作用。我们分析了由8个人组成的同性浅滩的高分辨率跟踪数据，以评估集体运动的不同方面，例如对齐，吸引附近的浅滩成员，游泳速度。我们的发现表明，孔雀鱼鱼群集体运动的变化可能不会受到相对端脑大小变化的强烈影响。我们的研究表明，集体移动动物的群体动力学可能不是由高级认知功能驱动的，而是由邻近个体之间相对简单的规则产生的基本认知过程驱动的。
