Random egg laying in host nests, rather than egg-matching, explains patterns of cuckoo parasitism: a comment on Zhang et al. (2023).
Random egg laying in host nests, rather than egg-matching, explains patterns of cuckoo parasitism: a comment on Zhang et al. (2023).
复制标题
DOI：
10.1098/rspb.2023.1018
复制
发表时间：
2023-09-13
影响因子：
4.7
通讯作者：
Liang, Wei
中科院分区：
文献类型：
--
作者：
Wang, Longwu;Liang, Wei
普通杜鹃(Cuculus Canorus)是研究最广泛的育雏期寄生虫。它在寄主的巢中产卵，依靠寄主孵化它的卵并抚养它的后代。寄主的高繁殖成本导致了抵抗寄生的手段的进化，包括识别和拒绝杜鹃卵的机制[2，3]。从理论上讲，为了减少寄主对杜鹃卵的识别和排斥，最优化模型预测，雌性杜鹃会选择卵色相似的物种的巢作为寄生目标[4]，因为随机产卵将是浪费。由于缺乏卵匹配的证据和相互矛盾的结果，杜鹃选择寄主巢的决定因素在很大程度上没有得到解决[5-7]，直到杨等人[8]证明雌性杜鹃在产卵期间忽略了寄主巢中卵的颜色和形态。这项基于强有力的视频证据和有效的实验设计的实地研究首次表明，杜鹃的产卵是随机的，不是由鸡蛋匹配策略决定的。随后，Yang等人[9，10]为普通杜鹃和另一种寄生系统--杜鹃(Cacomantis Merulinus)的随机产卵提供了进一步的证据[11]。最近，张等人发表了一种相反的观点，认为普通杜鹃基于卵匹配策略(即产蓝色蛋的普通杜鹃更喜欢蓝色蛋的寄主巢，而避开粉蛋的寄主巢)来选择寄生巢。然而，我们认为他们的实验结果并不完全支持卵子匹配假说，需要进一步的视频证据。在自然寄生率方面，张等人[12]发现，普通杜鹃选择蓝蛋筑巢的频率(19.3%，53/275)高于选择粉蛋筑巢的频率(7.9%，16/203)。这一发现与卵匹配假说是一致的，因为普通杜鹃产蓝色蛋，因此选择蓝色蛋的宿主将减少由于高度模仿蛋的颜色而被宿主识别和排斥的几率。达乌尔红蜘蛛(Phoenicurus Auroreus)能够识别和拒绝非模仿卵[13]，这有望大大提高寄生的成功率。然而，在张等人的研究中，一个极其重要的问题是，蓝蛋和粉蛋之间的寄生率的比较只基于装有幸存杜鹃蛋的巢箱，这排除了装有被宿主排斥的粉蛋的巢箱中的大部分蓝色杜鹃蛋。人类观察和鸟类视觉模型都表明，普通杜鹃的蛋颜色与宿主蛋高度相似[12]。因此，布谷鸟蛋在蓝色蛋的巢中基本上被寄主接受。相反，在粉色的寄主巢中产下的蓝色杜鹃蛋理论上会增加被拒绝的机会
The common cuckoo (Cuculus canorus) is the most extensively studied brood parasite. It lays eggs in host nests and depends on the host to incubate its eggs and raise its offspring [1]. The high reproductive cost to hosts has resulted in the evolution of means to resist parasitism, including mechanisms for identifying and rejecting cuckoo eggs [2, 3]. Theoretically, to reduce the recognition and rejection of cuckoo eggs by hosts, optimality models predict that female cuckoos will choose nests of species with a similar egg colour (hereafter referred to as ‘eggmatching’) as parasitic targets [4] because random laying would be wasteful [1]. Owing to weak evidence for egg-matching and conflicting results, the determinants of host nest selection by cuckoos were largely unresolved [5–7], until Yang et al.[8] demonstrated that female cuckoos ignore the colour and morphology of eggs in the host nest during egg-laying. This field study, based on strong video evidence and an effective experimental design, was the first to show that egg-laying in cuckoos is random and not determined by an eggmatching strategy. Subsequently, Yang et al.[9, 10] provided further evidence for the random egg-laying in common cuckoos and in an additional parasitic system, the plaintive cuckoo (Cacomantis merulinus)[11]. Recently, Zhang et al.[12] have published an opposing view, suggesting that common cuckoos select nests for parasitism based on an egg-matching strategy (ie common cuckoos that lay blue eggs prefer host nests with blue eggs and avoid host nests with pink eggs). However, we suggest that their experimental results do not fully support the egg-matching hypothesis and require further video evidence. In terms of the natural parasitism rate, Zhang et al.[12] found that the common cuckoo selects nests with blue eggs (19.3%, 53/275) more frequently than nests with pink eggs (7.9%, 16/203). This finding was consistent with the egg-matching hypothesis because the common cuckoo lays blue eggs, and thus selecting hosts with blue eggs would reduce the probability of egg identification and rejection by the host due to the highly mimetic egg coloration. The Daurian redstart (Phoenicurus auroreus) can recognize and reject non-mimetic eggs [13], and this is expected to substantially increase the success rate of parasitism. However, in the study by Zhang et al.[12], an extremely important issue is that the comparison of parasitism rates between blue and pink eggs was only based on nest-boxes with surviving cuckoo eggs, which excluded the majority of blue cuckoo eggs in nest-boxes with pink eggs that were rejected by the hosts. Human observation and avian vision modelling have both demonstrated that the egg colour of the common cuckoo is highly similar to that of host eggs [12]. Thus, cuckoo eggs in nests with blue eggs are largely accepted by the host. Conversely, blue cuckoo eggs laid in a pink host nest would theoretically have an increased chance of being rejected due
登录
查看更多内容
影响因子：
2.1
作者：
Cherry, M. I.;Bennett, A. T. D.;Moskat, C.
通讯作者：
Moskat, C.
影响因子：
1.8
作者：
Wang, Longwu;He, Gangbin;Feeney, William E.
通讯作者：
Feeney, William E.
DOI：
10.1098/rspb.2013.2665
发表时间：
2014-01-07
影响因子：
4.7
作者：
Honza, Marcel;Sulc, Michal;Prochazka, Petr
通讯作者：
Prochazka, Petr
哀怨的杜鹃不会选择与自己的蛋表型相匹配的裁缝鸟宿主
影响因子：
2.4
作者：
Yang, Canchao;Huang, Qiuli;Moller, Anders P.
通讯作者：
Moller, Anders P.
影响因子：
8.2
作者：
BROWN, SJ;GOETZMANN, W;ROSS, SA
通讯作者：
ROSS, SA