Importance of cooperation: How host nest defenses effectively prevent brood parasitism from the cuckoos

• Published in: iScience Vol. 26; no. 4; p. 106458
• Main Authors: Wang, Longwu, Zhao, Huahua, Luo, Haixia, He, Gangbin, Yan, Hanlin, Liang, Wei
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 21-04-2023; Elsevier
• Subjects: Biological sciences; Evolutionary biology; Ornithology; Evolutionary biology; Ornithology; Biological sciences
• ISSN: 2589-0042; 2589-0042
• DOI: 10.1016/j.isci.2023.106458

As the frontline defense against avian brood parasitism, nest defense is important in reducing nest parasitism and increasing host fitness. However, systematic studies on its effectiveness (i.e., on whether it successfully prevents cuckoo parasitism) are scarce. Based on 214 video recordings from 10 years of field observations, we evaluated the effectiveness of nest defenses of the Oriental reed warbler (Acrocephalus orientalis) in deterring common cuckoo (Cuculus canorus) parasitism. Under a breeding pair situation (≤ 2 hosts individuals), warblers were hardly effective in resisting the egg-laying of the cuckoo and many of the cuckoos under attack were able to complete the parasitic process without being harmed. However, when hosts ≥ 3 individuals, the warblers could effectively thwart the cuckoos and cause lethal damage to the cuckoo in partial cases. This indicated that the host group effectively resisted the cuckoo, demonstrating the importance of cooperation among host neighbors in resisting cuckoo parasitism.
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•When hosts number ≤ 2, nest defenses were hardly effective in resisting the cuckoos•When hosts number ≥ 3, the warblers could effectively thwart the cuckoo’s egg-laying•Cooperation among host neighbors is important for resisting cuckoo parasitism
Biological sciences; Ornithology; Evolutionary biology