Eggshell strength of an obligate brood parasite: a test of the puncture resistance hypothesis
Eggshell strength of an obligate brood parasite: a test of the puncture resistance hypothesis
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DOI：
10.1007/s00265-005-0132-6
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发表时间：
2006-05-01
影响因子：
2.3
通讯作者：
Roskaft, E
中科院分区：
文献类型：
--
作者：
Antonov, A;Stokke, BG;Roskaft, E
几种寄生虫卵的蛋壳比它们的大小预期的更厚、更结实。本文通过对大苇莺、大苇莺、沼泽莺和沙叶莺4种冠头目莺的产蛋成本的调查，对普通杜鹃产厚壳蛋的抗刺破假说进行了评价。后三种莺都有弹射的代价，而大苇莺弹射的代价并不大。退出成本的发生与主机账单大小呈负相关。以沼泽莺为研究对象，比较了自然寄生蜂巢的射精成本和两种人工寄生蜂巢的射精成本。宿主在射出厚壳布谷鸟的卵时，比射出同样大小但壳更薄的大苇莺的卵时，更容易损坏自己的卵，这为刺穿阻力假说提供了一些支持。射出同种卵不涉及任何费用。此外，与产蛋损伤假说的预测相反，没有证据表明卵损伤与杜鹃产蛋有关。在喷射过程中破坏自己卵的寄主比那些没有破坏的寄主更有可能随后抛弃自己的卵。沾有排出卵内容物的离合器的频率与外来卵刺破的假设难度呈正相关。讨论了普通布谷鸟卵较厚蛋壳的潜在优势。
Eggs of several brood parasites have thicker and stronger shells than expected for their size. The present study evaluated the puncture resistance hypothesis for the occurrence of thick-shelled eggs in common cuckoos Cuculus canorus by investigating costs of cuckoo egg ejection in four Acrocephalus warblers-the great reed warbler A. arundinaceus, reed warbler A. scirpaceus, marsh warbler A. palustris and sedge warbler A. schoenobaenus. The three latter species all suffered ejection costs, while ejection was not costly in the larger great reed warbler. The occurrence of ejection costs was negatively related to host bill size. In the marsh warbler, we compared ejection costs in naturally parasitized nests and two experimental treatments, in which broods were parasitized artificially with great reed warbler and conspecific eggs. Hosts damaged their own eggs significantly more often when ejecting the thick-shelled cuckoo eggs than when ejecting the similarly sized but thinner-shelled great reed warbler eggs, providing some support for the puncture resistance hypothesis. Ejection of conspecific eggs did not involve any costs. Furthermore, contrary to predictions derived from the laying damage hypothesis, there was no evidence that egg damage was associated with cuckoo egg laying. Hosts damaging their own eggs during ejection were more likely to subsequently desert their clutches than those that did not. The frequency of clutches smeared with the contents of the ejected egg were positively related to the hypothesized difficulty of foreign egg puncturing. Potential advantages of thicker shells in common cuckoo eggs are discussed.