Zhong Guo, Wan Guixia, Zhang Yuhan, Zhao Huahua, Wang Longwu, Liang Wei
Ministry of Education Key Laboratory for Ecology of Tropical Islands, College of Life Sciences, Hainan Normal University, Haikou 571158, China.
School of Life Sciences, Guizhou Normal University, Guiyang 550001, China.
iScience. 2023 Oct 6;26(11):108156. doi: 10.1016/j.isci.2023.108156. eCollection 2023 Nov 17.
Studies have shown that brood parasites lay their eggs early in the egg-laying sequence of their hosts, providing them with the advantage of earlier hatching. However, common cuckoos () appear to parasitize the nests of gray bushchat () during the late egg-laying stage. The bushchat often abandons parasitized nests in the early stages, but not in the late egg-laying stages, thus favoring late egg-laying by cuckoos. In this study, four experiments were conducted to determine whether gray bushchats employ a nest desertion strategy targeted at cuckoo parasitism. The results showed that nest desertion was significantly correlated with parasitism cues and occurred mainly during the hosts' early egg-laying stage. Our study provides the first experimental evidence that nest desertion is an anti-parasitic strategy used by hosts in response to cuckoos. Additionally, our experiments demonstrated that the nest desertion is influenced by the trade-offs of investments in different egg-laying stages.
研究表明，巢寄生者会在其宿主产卵序列的早期产卵，这使其具有孵化更早的优势。然而，普通杜鹃（ ）似乎在产卵后期寄生灰林莺（ ）的巢穴。灰林莺通常会在早期阶段放弃被寄生的巢穴，但在产卵后期不会，因此有利于杜鹃在后期产卵。在本研究中，进行了四项实验以确定灰林莺是否采用针对杜鹃寄生的弃巢策略。结果表明，弃巢与寄生线索显著相关，且主要发生在宿主产卵的早期阶段。我们的研究提供了首个实验证据，表明弃巢是宿主针对杜鹃采用的一种抗寄生策略。此外，我们的实验表明，弃巢受到不同产卵阶段投资权衡的影响。
