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Risk-taking behaviour of bull-headed shrikes that recently colonized islands
Current Zoology ( IF 2.2 ) Pub Date : 2020-07-13 , DOI: 10.1093/cz/zoaa036
Shoji Hamao 1 , Hisahiro Torikai 2 , Midori Yoshikawa 1 , Yutaka Yamamoto 3 , Tugeru Ijichi 4
Affiliation  

Individuals which have invaded urbanized environments are reported to engage in riskier behaviours, possibly influenced by the scarcity of predators in urbanized areas. Here, we studied the risk-taking behaviour of birds which had invaded a new natural environment, rather than an artificial urban environment, using recently established populations of the bull-headed shrike Lanius bucephalus, which naturally colonized three subtropical islands in Japan. We compared flight initiation distance (FID), the distance at which an individual approached by a human initiates flight, between the islands and the temperate mainland. FID was longer for the insular shrikes compared with the mainland shrikes after controlling for other factors, indicating that the individuals which had invaded a new natural environment had a lower propensity for risk-taking. A possible explanation for these results is that low risk-taking behaviour might be adaptive on the islands due to predation by the black rat Rattus rattus, an unfamiliar predator not found in shrike habitats on the temperate mainland. Further studies are needed to examine the nest predation rate, predator species and nest site selection of these insular shrike populations.

中文翻译:

最近在各岛上殖民的牛头sh的冒险行为

据报道,入侵城市化环境的个人从事危险行为,可能受到城市化地区掠食者稀缺的影响。在这里,我们使用最近建立的牛头伯劳伯劳犬(Lanius bucephalus)种群研究了入侵新自然环境而非人工城市环境的鸟类的冒险行为。,自然地殖民了日本的三个亚热带岛屿。我们比较了岛屿和温带大陆之间的飞行起始距离(FID),即人类接近的人起始飞行的距离。在控制了其他因素之后,岛上sh礁的FID比大陆sh礁更长,这表明入侵新自然环境的人承担风险的倾向较低。对于这些结果的可能解释是,由于黑老鼠Rattus rattus的捕食,低冒险行为可能在岛上具有适应性,在温带大陆的伯劳栖息地中找不到陌生的捕食者。需要进一步的研究来检查这些岛屿伯劳鸟种群的巢捕食率,捕食物种和巢址选择。
更新日期:2020-07-13
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