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Sex-speciffc selective effect of winter weather on morphological traits in a small passerine bird

Avian Research 2023年第2期14卷 166-173页

作者： Yue Wang Qian Hu Jiliang Xu Jianqiang Li School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina

Harsh environmental conditions often impose strong selection on the phenotype of natural populations through impacts on their *** overwintering birds,winter is an important period for survival because the weather conditions in winter is usually severer than in other seasons and birds often suffer more thermoregulation costs while food is in short ***,the selective effect of weather conditions on phenotype in winter is expected to be *** this study,we examined the relationship of overwinter survival of Silver-throated Tits(aegithalos glaucogularis)with their morphological traits under different levels of winter conditions(winters with and without snowstorms)to explore the differential selective effect of winter weather on their *** found that regardless of whether the winter experienced a snowstorm,the female Silver-throated Tits with a smaller bill surface area or smaller bill depth and a smaller surface area:volume ratio were more likely to survive during the winter,which supported the hypothesis of selection for heat ***,the females with a smaller body length survived better than the larger females,indicating that the lesser food requirements for smaller body sizes may confer advantages during the winter when food availability was *** addition,in agreement with the finding in many short-lived birds that survival rate increases with the increase of age,older(≥2-year-old)female Silver-throated Tits had higher overwinter survival than 1-year-old ***,we did not find any correlation of morphological traits and age with survival in male Silver-throated *** results illustrate differential selective effects of winter weather on female and male Silver-throated Tits and contribute to the knowledge of sex-specific selection on the phenotype of natural populations.

关键词： aegithalos glaucogularis Age Morphological traits Natural selection Overwinter survival Sex-specific selection

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Research activity does not affect nest predation rates of the Silver-throated Tit,a passerine bird building domed nests

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Avian Research 2020年第3期11卷 326-335页

作者： Qian Hu Ye Wen Gaoyang Yu Jiangnan Yin Haohui Guan Lei Lv Pengcheng Wang Jiliang Xu Yong Wang Zhengwang Zhang Jianqiang Li School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China School of Life Sciences Sun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Department of Biological and Environmental Science College of AgriculturalLife and Natural SciencesAlabama A&M UniversityNormalAL 35762USA Ministry of Education Key Laboratory for Biodiversity Sciences and Ecological Engineering College of Life SciencesBeijing Normal UniversityBeijing 100875China

Background:Research activities have often been thought to potentially influence avian nesting success by increasing nest predation *** recent studies of species building open nests and cavity nests suggest that research disturbance does not generally induce nest predation,whether it is also the case in species building domednests remains *** birds,domed-nest species exist in about half of the passerine families,and research disturbance to the domed nests may differ from that to the nests of other types for their different nest ***:We investigated if research activities affected nest predation rate by analyzing the relationships of the daily nest survival rate with the research activities at the egg and nestling stages of a domed-nest species,the Silverthroated Tit(aegithalos glaucogularis).Results:Our results showed that nest daily survival rate was significantly affected by the laying date and nest age during the egg stage,and by the hatching date only during the nestling *** contrast,there were no significant effects of research activities,in terms of visiting nests and filming nests,on the nest survival of the Silver-throated Tit at both the egg and nestling ***:Our results coincide with the findings in species building other types of nests that research activities do not always have negative effects on avian nesting success.

关键词： aegithalos glaucogularis Nest filming Nest predation Nest survival Nest visit Research disturbance

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