Colonial breeding imposes increased predation: experimental studies with herons
Colonial breeding imposes increased predation: experimental studies with herons
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殖民地繁殖增加了捕食：苍鹭的实验研究
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
G. Bogliani
中科院分区：
文献类型：
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作者：
F. Bellinato;G. Bogliani
在连续2年的实验中，测试了鹭的巢捕食在殖民地和非殖民地巢穴之间是否存在差异。将含有鸡蛋的假巢染成浅蓝色，放在混合的夜鹭和小白鹭鹭中，以及没有筑巢的苍鹭的对照林中；在这两个地区，冠鸦是主要的蛋捕食者。实验是在真正的巢有蛋（同步巢）和真正的巢有小鸡（延迟巢）时进行的。鹭群中的假巢比孤立的假巢更容易被捕食。延迟的假巢比同步的假巢遭受更多的捕食。建立了蚁群中心放置假巢的捕食概率预测逻辑回归模型；对于同步的假巢，距离最近的被占领的真实巢穴的距离进入模型，接近真实巢穴的假巢不太可能被捕食。就被捕食的可能性而言，在一个群体中筑巢是代价高昂的。
Experiments were carried out over 2 consecutive years to test whether heron nest predation differs between colonial and non-colonial nests. Dummy nests containing chicken eggs dyed light blue were placed in a mixed Night Heron and Little Egret heronry and in a control copse without nesting herons; in both areas Hooded Crows were the main egg predators. Experiments were performed both when the true nests had eggs (synchronized nests) and when the true nests contained chicks (delayed nests). Dummy nests within the heronry were more preyed upon than isolated dummy nests. Delayed dummy nests suffered higher predation than synchronized ones. A predictive logistic regression model for predation probability was developed for the dummy nests placed in the centre of the colony; for the synchronized dummy nests the distance from the nearest occupied real nest entered the model and dummy nests close to real nests were less likely to be preyed upon. Nesting in a colony is costly in terms of predation probability, pro...