Can snakes use yolk reserves to maximize body size at hatching?

作     者：Yan-Fu QU Shu-Zhan ZHAO Xu-Fei JIANG Long-Hui LIN Xiang JI 

作者机构：Jiangsu Key Laboratory for Biodiversity and BiotechnologyCollege of Life SciencesNanjing Normal UniversityNanjingJiangsuChina Hangzhou Key Laboratory for Animal Adaptation and EvolutionCollege of Life and Environmental SciencesHangzhou Normal UniversityHangzhouZhejiangChina 

出 版 物：《Current Zoology》 (动物学报（英文版）)

年 卷 期：2019年第65卷第6期

页      面：627-631页

核心收录：

学科分类：0710[理学-生物学] 071010[理学-生物化学与分子生物学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：国家自然科学基金 the Natural Science Foundation of Zhejiang Province to L.-H.L 

主　　题：hatchling phenotype Naja atra residual yolk snake yolk partitioning yolk removal 

摘      要：We experimentally miniaturized freshly laid eggs of the Chinese cobra Naja atra(Elapidae)by removing^10%and^20%of original *** tested if yolk-reduced eggs would produce 1)normal-sized hatchlings with invariant yolk-free body mass(and thus invariant linear size)but dramatically reduced or even completely depleted residual yolk,2)smaller hatchlings with normal­sized residual yolk but reduced yolk-free body mass,or 3)smaller hatchlings of which both yolk-free body mass and residual yolk are proportionally *** quantity affected hatchling linear size(both snout-vent length and tail length)and body ***,changes in yolk quan­tity did not affect incubation length or any hatchling trait examined after accounting for egg mass at laying(for control and sham-manipulated eggs)or after yolk removal(for manipulated eggs).Specifically,yolk-reduced eggs produced hatchlings of which all major components(carcass,re­sidual yolk,and fat bodies)were scaled down *** show that snakes cannot use yolk reserves to maximize their body size at ***,our data also suggest that the parti­tioning of yolk in embryonic snakes is species-specific.