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Egg-spot matching in common cuckoo parasitism of the oriental reed warbler: effects of host nest availability and egg rejection

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Chinese Birds 2016年第4期7卷 199-209页

作者： Donglai Li Yanan Ruan Ying Wang Alan K.Chang Dongmei Wan Zhengwang Zhang Provincial Key Laboratory of Animal Resource and Epidemic Disease Prevention College of Life Sciences Liaoning University Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering College of Life Sciences Beijing Normal University

Background: The success of cuckoo parasitism is thought to depend largely on the extent of egg matching between cuckoo and host eggs, since poor-matching cuckoo egg would lead to more frequent egg rejection by the host. In this study, we investigated how egg-spot matching between the Common Cuckoo(Cuculus canorus) and its host, the oriental reed warbler(Acrocephalus orientalis) is affected by the local parasitism rate, nest availability in breeding synchronization and egg ***: We used the paired design of parasitized and their nearest non-parasitized nests where breeding occurred simultaneously to compare egg-spot matching. The image analysis was used to compare four eggshell pattern variables, namely spot size, density, coverage on the different areas of egg surface, and the distribution on the whole egg surface. Egg recognition experiments were conducted to test the effect of egg spots on egg rejection by the ***: Our results show that much better matching in almost all spot parameters tested on the side of the egg and the spot distribution on the whole egg occurred in parasitized nests than in non-parasitized nests. Matching of spot density between cuckoo and host eggs in parasitized nests increased with the synchronization between temporal availability of nests and the egg-laying period of female cuckoos. Egg recognition experiments in which the warbler eggs were deliberately painted with extra spots led to a significantly higher egg rejection rate(78.3%) than of unpainted ***: Our data suggest that both the high temporal encounter rate between cuckoo and warbler nests as well as the high egg rejection ability of the host are important factors for egg-spot matching of the cuckoos.

关键词： Brood parasite Cuckoo Egg mimicry Egg matching Spot pattern Egg rejection Parasitism rate oriental reed warbler

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Experimental evidence that cuckoos preferentially parasitize host nests early in their laying cycle

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Avian Research 2022年第3期13卷 328-331页

作者： Longwu Wang Gangbin He Yuhan Zhang Wei Liang William E.Feeney School of Life Sciences Guizhou Normal UniversityGuiyang550001China Ministry of Education Key Laboratory for Ecology of Tropical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikou571158China Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for OrnithologySeewiesen82319Germany Department of Biosciences Durham UniversityDurhamDH13LEUnited Kingdom

Brood parasites,such as the Common Cuckoo(Cuculus canorus),rely on manipulating hosts from other species to raise their *** should favor individuals that are able to identify and choose host nests that closely match the incubation stage of their own *** intuitive,and supported by the findings of numerous longterm monitoring studies,experimental evidence of this remains *** using video monitoring,we used three experimental groups to explore whether Common Cuckoos preferentially choose host oriental reed warbler(Acrocephalus orientalis)nests that are early in their laying *** found that Common Cuckoos preferentially parasitize nests of the host oriental reed warbler that are earlier in their laying(less *** eggs)or nesting cycle(eggs ***),and videos of our experiments provide direct insights into their decision making *** results provide strong experimental evidence that Common Cuckoos are able to assess nesting stage and strategically choose nests that increase the likelihood of successful parasitism.

关键词： Brood parasitism Common Cuckoo Clutch size Egg laying oriental reed warbler

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