How does asymmetric sibling rivalry respond under environmental metal pollution?A case study of the Tree Sparrow(Passer montanus)

作     者：Jian Ding Shengnan Wang Wenzhi Yang Huijie Zhang Ni Wang Yingmei Zhang Jian Ding;Shengnan Wang;Wenzhi Yang;Huijie Zhang;Ni Wang;Yingmei Zhang

作者机构：School of Life SciencesHenan Normal UniversityXinxiang453007China Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental PollutionSchool of Life SciencesLanzhou UniversityLanzhou730000China 

出 版 物：《Avian Research》 (鸟类学研究(英文版))

年 卷 期：2025年第16卷第1期

页      面：74-82页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：supported by the National Natural Science Foundation of China (No.32370508 and 32201266) the China Postdoctoral Science Foundation (No.GZC20230731) 

主　　题：Passer montanus Environmental metal pollution Offspring characteristics Asymmetric sibling competition 

摘      要：The imbalanced allocation of maternal resources to eggs and nestlings may significantly impact the phenotype and fitness of ***,anthropogenic metal pollution has been reported to exert adverse effects on avian ***,we herein evaluated the relationships among offspring characteristics,asymmetric sibling rivalry,and the resulting offspring phenotype in a small passerine bird,Tree Sparrow(Passer montanus),at a polluted site(Baiyin,BY)and a relatively unpolluted site(Liujiaxia,LJX).By initiating incubation before the completion of clutch,asymmetric sibling rivalry might create a core and marginal offspring within the *** this study,lower egg mass,fewer core offspring,and more marginal offspring were found at the polluted *** eggshell speckling and coloration were relatively similar between the two sites,higher eggshell spotting coverage ratio and lower eggshell lightness(L*)and hue(h°)were observed in core eggs than in marginal eggs at the unpolluted *** clutch size had a positive relationship with egg mass at the polluted site and with brood size at hatching at the unpolluted *** differences in egg measurements across the laying orders in the samples were relatively large for larger clutch *** core and marginal egg masses had a significant positive effect on the size of early core nestlings and late marginal nestlings at the unpolluted *** rate was significantly positively related to the incubation period and nestling period,while negative relationship with mean spotting coverage ratio was found at the polluted *** nestlings at the polluted site showed a higher mortality ***,although asymmetric sibling competition strongly determines the variation of marginal offspring size,the effect is less dramatic in metal-polluted environments,providing some respite to wild birds that survive pollution-induced stress.