奇台沙蜥生长过程中的两性异形  

Ontogenetic Shifts of Sexual Dimorphism in Phrynocephalus grumgrzimailoi(Agamidae)

作　　者：刘洋[1] 时磊[1] 

机构地区：[1]新疆农业大学动物科学学院,乌鲁木齐830052

出　　处：《四川动物》2009年第5期710-713,共4页Sichuan Journal of Zoology

基　　金：国家自然科学基金项目(30360014;30770264)资助

摘　　要：研究奇台沙蜥Phrynocephalus grumgrzimailoi头、尾、腋胯距大小在个体发育过程中的变化。成体体长(SVL)无显著的两性差异,两性异形主要表现为雄性个体有较大的头部(头长和头宽)和尾部,雌性具有较大的腋胯距。头、尾、腋胯距大小的两性异形在幼体就已存在,并随个体发育的进行变得更加显著。不同年龄组两性个体头部、尾部、腋胯距随SVL呈异速增长,表现为两性头部的增长速率在个体发育过程中逐渐增大,尾部的增长速率逐渐减慢,腋胯距在雌性蜥蜴中增长速率逐渐增大,在雄性中逐渐变小。Males and females of Phrynocephalus grumgrzimailoi from a population in Urumchi, Xinjiang, western China, differ in head size at the juvenile stage, with males having larger heads than females but females having larger venters. This sexual dimorphism is more pronounced in adults than in juveniles. Adults do not show a sexual dimorphism in snout-vent length （ SVL）, but males attain longer tails and shorter venters than females with the same SVL. An allometric growth pattern with SVL＇s increase is shown in the head size, tail length and venter size of both sexes. The growth rate of the head size becomes increasingly fast and the growth rate of tail length slower and slower with ontogeny. However, the venter grows increasingly faster in females but slower in males.

关 键 词：奇台沙蜥 两性异形 生长 

分 类 号：Q954[生物学—动物学]