Egg trait variation in a large hawk-cuckoo (Hierococcyx sparverioides) host population of Chinese babax (Babax lanceolatus)
Egg trait variation in a large hawk-cuckoo (Hierococcyx sparverioides) host population of Chinese babax (Babax lanceolatus)
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大型鹰杜鹃（Hierococcyx sparverioides）寄主巴巴克斯（Babax lanceolatus）群体的卵性状变异
DOI：
10.1111/1749-4877.12128
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发表时间：
2015
影响因子：
3.3
通讯作者：
Liang Wei
中科院分区：
文献类型：
--
作者：
Yang Canchao;Liu Yang;Liang Wei
寄生虫与宿主之间的相互作用是研究宿主-寄生虫协同进化的一个著名模型系统。双方都采取了类似于进化军备竞赛的行动，其中适应和反适应是宿主-寄生虫动力学的结果，例如经典的布谷鸟-宿主系统。区分寄生虫和布谷鸟卵并排斥外来卵被认为是一种重要的抗寄生虫策略。中国巴巴克斯（Babax lanceolatus）是一种大型鹰杜鹃（Hierococcyx sparverioides）宿主，分布于中国西南部。先前的一项研究表明，巴巴克斯是一个中间的鸡蛋排斥者，大多数杜鹃蛋被中国巴巴克斯接受，尽管有一小部分宿主拒绝杜鹃蛋。有趣的是，大鹰杜鹃产下的蛋是非模仿的，而狒狒的蛋是均匀的蓝色。由于卵的颜色是一个关键的线索，有利于主机识别寄生卵的宿主物种，我们使用了光谱仪来量化卵的颜色变化，了解卵排斥和受体之间的区分能力。我们发现，巴巴克斯卵的窝内变异的色度在卵排斥者中比在接受者中更一致。然而，在这两种类型的宿主之间的窝间变异中未发现统计学显著性。我们的研究结果表明，宿主产卵时具有低水平的窝内变异，而不需要同时具有高水平的窝间变异，正如鸡蛋签名假说所预测的那样。这项研究可能进一步表明，来自进化上最近的寄生虫的选择压力可以在抗寄生虫策略中驱动基于个体的差异。
Mutual interaction between brood parasites and their hosts is a well‐known model system for studying host–parasite coevolution. Both parties have acted reciprocally, resembling an evolutionary arms race, in which adaptations and counter‐adaptations have evolved as a result of host–parasite dynamics, such as the classical cuckoo–host system. Discrimination among parasite and cuckoo eggs and rejection of foreign eggs is regarded as an important anti‐parasitism strategy. The Chinese babax (Babax lanceolatus) is a large hawk‐cuckoo (Hierococcyx sparverioides) host distributed in southwest China. A previous study shows that the babax is an intermediate egg rejector, and most cuckoo eggs are accepted by the Chinese babax, although a small proportion of hosts reject cuckoo eggs. Interestingly, the large hawk‐cuckoo lays non‐mimetic eggs in contrast to the uniform blue eggs of babaxes. Because egg coloration is a critical cue used by host species in favor of the recognition of parasitic eggs by hosts, we used a spectrometer to quantify egg color variation to understand the differentiation in discrimination ability between the egg rejectors and acceptors. We found that the chroma of intra‐clutch variation of babax eggs was more consistent in egg rejectors than in acceptors. However, no statistical significance was found in inter‐clutch variation between these two types of hosts. Our results suggest that hosts lay eggs with a low level of intra‐clutch variation without the necessity of a high level of inter‐clutch variation simultaneously as predicted by the egg signature hypothesis. This study may further indicate that selection pressures from evolutionarily recent parasites can drive individual‐based differences in an anti‐parasitism strategy.