【摘要】 根据2001和2002两年间6个月的标志重捕资料,在对分布于四川西北部若尔盖草原的青海沙蜥(Phrynocephalusvlangalii)的体长、体重和尾长3组数据进行相关分析的基础上,分别对这3组数据进行聚类分析.最后选取体长的聚类分析结果把青海沙蜥的所有个体分成3个年龄组,3个年龄组的体长范围分别是:26～36mm;37～50mm;51～65mm.各年龄组体长、体重和尾长平均值差异的F检验结果,说明用体长划分年龄较为合理.青海沙蜥种群的年龄结构基本上呈金字塔形,但第II年龄组个体数比例较小.青海沙蜥各年龄组的性比在3个年龄组间是不稳定的,第I,II,III3个年龄组雌雄个体数量的比分别为7.7∶1,32∶1和1∶2.1,而在整个种群中雌雄个体的比为1.76∶1.青海沙蜥的体形大小的性二态在其性成熟前后是相反的.更多还原

【Abstract】 During six monthes in 2001 and 2002,the authors collected the data of body length,body mass and tail length of Phrynocephalus vlangalii distributed in Zoigê grassland,northwest Sichuan.Based on the correlation analysis of three group data,a class analysis study was conducted on them. Using body length as a major criterion, P. vlangalii can be divided into three age groups.The ranges of body length of each group are, respectively, 26～36mm, 37～50mm and 51～65mm. The results of a Ftest of difference of body mass, body length and tail length among 3 age groups show that age-dividing by body length is more reasonable. The age structure of P. vlangalii tends to be pyramid, but the individual number of Group II is less. The sex ratios (female : male) of three groups are, respectively, 7.7∶1, 32∶1 and 1∶2.1, the overallsex ratio of the population is 1.76∶1. The result shows that the sex ratios among different age groups are not stable.Between groupⅠ and group Ⅲ sexual dimophism of body size of P. vlangalii are contrary.更多还原