When should Common Cuckoos Cuculus canorus lay their eggs in host nests?
When should Common Cuckoos Cuculus canorus lay their eggs in host nests?
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DOI：
10.1080/00063657.2015.1125851
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发表时间：
2016-01-02
期刊：
影响因子：
0.7
通讯作者：
Moskat, Csaba
中科院分区：
文献类型：
--
作者：
Geltsch, Nikoletta;Ban, Miklos;Moskat, Csaba
寄生于囊巢的普通杜鹃Cuculus canorus雏鸟比它们的大苇莺Acrocephalus arundinaceus宿主的雏鸟更早孵化，目的通过野外观察，揭示布谷鸟产卵的最佳时期与寄主产卵周期的关系，以确保寄生雏的优先孵化。方法通过对布谷鸟产卵的时间、寄主产卵周期结果大苇莺在寄主开始产卵后第5天孵化的次数比第3天多。布谷鸟蛋孵化早于主机时，他们奠定了主机孵化（第4天）开始之前。布谷鸟卵在第5- 6天产卵时，约2/3的巢仍保持优先孵化状态。结论布谷鸟卵大多数在寄主孵化前产卵，这与其它适应机制共同保证了布谷鸟卵的优先孵化。布谷鸟蛋在孵化开始后产下，在大约30%的巢中失去了孵化前的优势。
Capsule Brood parasitic Common Cuckoo Cuculus canorus chicks hatch earlier than the nestlings of their Great Reed Warbler Acrocephalus arundinaceus hosts, but hatching priority is less consistent when Cuckoo eggs are laid after the onset of host incubation.Aim To reveal by field observations what the optimal stage is for Cuckoos to lay their eggs in relation to the host laying cycle to ensure prior hatching of the parasitic chicks.Methods We monitored the hatching of Cuckoo chicks in relation to the hosts' laying stage at which the Cuckoo eggs appeared and also monitored host incubation behaviour.Results Great Reed Warblers incubated more on day 5 after the host's onset of laying relative to day 3. All Cuckoo eggs hatched earlier than hosts when they were laid prior to the onset of host incubation (day 4). Cuckoo eggs also maintained hatching priority in about 2/3 of the nests when laid on days 5-6.Conclusions Most Cuckoo eggs are laid prior to the onset of host incubation and this, together with other adaptive mechanisms, ensures the prior hatching of Cuckoo eggs. Cuckoo eggs laid after the onset of incubation lose the advantage of prior hatching in approximately 30% of nests.