野生中较大的鱼群可以做出更好,更快的决策
Korbinian Pacher1,2, David Bierbach1,2,3, Yunus Sevinchan3,4
1Faculty of Life Sciences, Humboldt-Universität zu Berlin, Berlin, Germany.
Science advances
|July 30, 2025
概括
较大的鱼群更好地检测捕食者,不会增加虚假警报. 这种集体认知可以提高群体的决策速度和准确性,克服孤独动物面临的挑战.
科学领域:
- 集体认知 集体认知
- 动物行为 动物行为
- 生态生态学 生态生态学
背景情况:
- 群体规模往往会提高信息流动,对集体认知有好处.
- 然而,目前尚不清楚团体是否会放大不适应性信息,如虚假警报,以及这些成本是否会抵消收益.
研究的目的:
- 调查野生鱼群是否放大了虚假警报,以及鱼群大小如何影响对掠食者攻击和无害飞越的集体反应.
- 为了确定较大的群体是否可以克服检测准确性,错误报警率和决策速度之间的权衡.
主要方法:
- 在野生鱼群中分析集体逃生潜水反应.
- 对实际鸟类袭击 (真实阳性) 和无害的飞越 (虚假警报) 的反应在不同规模的小群中进行比较.
- 与群体大小相关的决策时间的测量.
主要成果:
- 较大的鱼群显示,捕食者攻击的检测能力增加 (真实阳性).
- 无害的飞越 (错误报警) 的响应率保持不变,无论群体大小如何.
- 随着小群的大小的增加,决策时间显著减少.
结论:
- 增加群体大小可以提高威胁的集体检测,同时保持一个稳定的错误报警率.
- 较大的群体有效地减轻了真实阳性和虚假阳性之间的权衡,以及决策速度和准确性之间的权衡.
- 研究结果提供了对集体决策机制及其进化优势的见解.
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