Sleeping gulls monitor the vigilance behaviour of their neighbours
Sleeping gulls monitor the vigilance behaviour of their neighbours
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DOI：
10.1098/rsbl.2008.0490
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发表时间：
2009-02-23
期刊：
影响因子：
3.3
通讯作者：
Beauchamp, Guy
中科院分区：
文献类型：
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作者：
Beauchamp, Guy
人们通常认为，群体中的个体会彼此独立地审视周围的威胁。然而，模型表明，觅食者应监测其邻居的警惕性，以防止作弊，并收集有关早期捕食风险的信息。监测警惕性的证据很少。在这里，我研究了警惕水平的变化在睡眠海鸥（Larus sp。周围都是各种戒备状态的邻居通过控制群体规模和邻居密度，海鸥更频繁地打断睡眠来扫描周围环境，因此当邻居警觉而不是睡觉或梳理羽毛时，它们会更加警惕。研究结果为鸟类群体内警惕性的复制提供了证据，表明群体中捕食风险的信息流是复杂的。
Individuals in groups are often thought to scan their surroundings for threats independently of one another. Models, however, suggest that foragers should monitor the vigilance level of their neighbours to prevent cheating, and to gather information about incipient predation risk. Evidence for monitoring of vigilance is scant. Here, I examined changes in vigilance levels in sleeping gulls (Larus sp.) surrounded by neighbours in various states of alertness. Controlling for group size and neighbour density, gulls interrupted sleep more often to scan their surroundings, and were therefore more vigilant, when their neighbours were alert rather than sleeping or preening. The results provide evidence for copying of vigilance within groups of birds, suggesting a complex flow of information about predation risk in groups.