Keeping eggs warm: thermal and developmental advantages for parasitic cuckoos of laying unusually thick-shelled eggs
Keeping eggs warm: thermal and developmental advantages for parasitic cuckoos of laying unusually thick-shelled eggs
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保持蛋温暖寄生杜鹃产异常厚壳蛋的热和发育优势
DOI：
10.1007/s00114-017-1532-y
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发表时间：
2018
影响因子：
1.8
通讯作者：
Moller Anders Pape
中科院分区：
文献类型：
--
作者：
Yang Canchao;Huang Qiuli;Wang Longwu;Du Wei Guo;Liang Wei;Moller Anders Pape
专性育雏寄生虫已经进化出异常厚壳的卵，这被假设为具有多种功能，如抵抗宿主的穿刺排出。在这项研究中，我们测试的假设，专性育雏寄生虫奠定了异常厚壳的鸡蛋，以保留更多的热量为发展中的胚胎，从而有助于早期孵化的寄生虫卵。通过这样做，我们使用了红外热成像系统作为一种非侵入性的方法来量化普通杜鹃（Cuculus canorus）和他们的东方苇莺（Acrocephalus orientalis）主机的蛋壳的温度在一个实验中，人为地改变孵化的持续时间。结果表明，布谷鸟蛋壳在孵化过程中的温度高于寄主卵，但在孵化干扰过程中温度波动较小。因此，有一个热的，因此，发育优势的卵寄生杜鹃产卵厚壳，提供了另一种可能的解释，特别是厚壳的专性卵寄生和杜鹃卵孵化较早的主机相比。
Obligate brood parasites have evolved unusually thick-shelled eggs, which are hypothesized to possess a variety of functions such as resistance to puncture ejection by their hosts. In this study, we tested the hypothesis that obligate brood parasites lay unusually thick-shelled eggs to retain more heat for the developing embryo and thus contribute to early hatching of parasite eggs. By doing so, we used an infrared thermal imaging system as a non-invasive method to quantify the temperature of eggshells of common cuckoos (Cuculus canorus) and their Oriental reed warbler (Acrocephalus orientalis) hosts in an experiment that artificially altered the duration of incubation. Our results showed that cuckoo eggshells had higher temperature than host eggs during incubation, but also less fluctuations in temperature during incubation disturbance. Therefore, there was a thermal and hence a developmental advantage for brood parasitic cuckoos of laying thick-shelled eggs, providing another possible explanation for the unusually thick-shelled eggs of obligate brood parasites and earlier hatching of cuckoo eggs compared to those of the host.