阿尔泰山前荒漠两种沙蜥体况指数特征及其与生态因子的关系

为明确奇台沙蜥(Phrynocephalus grumgrzimailoi)和旱地沙蜥(P. helioscopus)体况指数的年龄性别特征, 及其与海拔、年均温、年降水量、平均日较差之间的关系, 我们测量了阿勒泰地区84只奇台沙蜥与176只旱地沙蜥的体况数据, 用log体重/log头体长表示体况指数。结果显示: (1)旱地沙蜥与奇台沙蜥间体况指数差异显著。(2)旱地沙蜥体况指数雌雄两性差异不显著, 奇台沙蜥体况指数雌雄两性差异显著。(3)两种蜥蜴成体与亚成体间体况指数均差异明显。(4)以月份为单位, 奇台沙蜥体况指数月份差异明显, 旱地沙蜥体况指数月份差异不明显。(5)年均温对奇台沙蜥体况指数有重要影响, 而年降水量为补充因子, 主要通过与其他生态因子组合发挥作用, 海拔对旱地沙蜥体况指数有影响。这些结果表明两种沙蜥对不同环境因子的反应不同, 在不同环境的适应度也不同。

The relationship between body condition index and ecological factors in two Phrynocephalus species in the piedmont desert of Altai Mountains

We investigated the age-related and sexual characteristics in Phrynocephalus helioscopus and P. grumgrzimailoi using the body condition index and its relationship to annual mean temperature, annual precipitation, altitude, and mean diurnal range. We collected body measurement data for 176 individuals of P. helioscopus and 84 individuals of P. grumgrzimailoi. The body condition index is comprised of the ratio of log body mass to log snout-vent length. There were significant differences of the body condition index between P. helioscopus and P. grumgrzimailoi. In P. grumgrzimailoi, body condition indices between the sexes were significantly different but were not in P. helioscopus. Differences between sub-adults and adults were significant in both species. Body condition index of P. grumgrzimailoi differed significantly through time but remained unchanged in P. helioscopus. Annual mean temperature is a significant predictor for body condition index of P. grumgrzimailoi and interacts with annual precipitation in our models. Meanwhile, altitude had significant effects on body condition index in P. helioscopus. These results suggest that these two species respond differently to various environmental factors, and their adaptability to different environmental conditions are not the same.