Small increases in group size improve small shoals' response to water flow in zebrafish.
Small increases in group size improve small shoals' response to water flow in zebrafish.
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DOI：
10.1111/jzo.12952
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发表时间：
2022-04
影响因子：
2
通讯作者：
Martins, E. P.
中科院分区：
文献类型：
--
作者：
Suriyampola, P. S.;Iruri-Tucker, A. A.;Padilla-Velez, L.;Enriquez, A.;Shelton, D. S.;Martins, E. P.
社会环境可能会影响对感官线索的感知和展示精细行为反应的能力。以前的工作表明，对环境线索的有效反应可能取决于一个群体中有足够数量的个人。因此，群体规模的变化可能会对社会小群体的行为产生深远的影响。利用斑马鱼(Danio Rerio)，我们研究了群体规模的变化如何影响对水流变化的反应能力。我们发现，即使将成对的鱼与四条鱼的群体进行比较，相对较大的群体中的鱼也表现出更强的流变性，这表明群体规模的小幅增加可以增强对环境变化的反应。相对较大的群体中的个体鱼也比成对的个体花费更少的时间在耗费能量的领先位置上，这表明即使群体规模的小幅增加也可能提供能量方面的好处。我们还发现，浅滩的凝聚力依赖于群体的大小，但在给定的群体规模内，浅滩的凝聚力不随流速变化。我们的研究强调，即使群体规模的微小变化也可能显著影响群居鱼类对水流变化的反应方式，这可能是塑造群居动物在不断变化的环境中的弹性的一个重要属性。
Social context may influence the perception of sensory cues and the ability to display refined behavioral responses. Previous work suggests that effective responses to environmental cues can be contingent on having a sufficient number of individuals in a group. Thus, the changes in group size may have profound impacts, particularly on the behavior of small social groups. Using zebrafish (Danio rerio), here we examined how changes in group size influence the ability to respond to changes in water flow. We found that fish in relatively larger groups displayed stronger rheotaxis even when comparing pairs of fish with groups of four fish, indicating that a small increase in group size can enhance the responsiveness to environmental change. Individual fish in relatively larger groups also spent less time in the energetically costly leading position compared to individuals in pairs, indicating that even a small increase in group size may provide energetic benefits. We also found that the shoal cohesion was dependent on the size of the group but within a given group size, shoal cohesion did not vary with flow rate. Our study highlights that even a small change in group size could significantly affect the way social fish respond to the changes in water flow, which could be an important attribute that shapes the resilience of social animals in changing environments.
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