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.
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 Ftest 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.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2002年第6期1134-1139,共6页
Journal of Sichuan University(Natural Science Edition)
基金
中国科学院知识创新工程课题基金(KSCX2 1 06A)
国家教育部湿地研究专项基金
