布氏田鼠肥满度分析和小型兽类肥满度指标K与K_(WL)(重长指标)的比较

ANALYSIS OF RELATIVE FATNESS OF BRANDT'S VOLES AND A COMPARISON BETWEEN RELATIVE FATNESS K AND K_(WL)(WEIGHT/LENGTH INDEX)IN SMALL MAMMALS

通过对两个肥满度指标的理论和生物学意义分析，以及对布田鼠肥满度的研究和实际应用 的讨论，认为：描述动物的肥满度时，重长指标ＫＷＬ优于指标Ｋ。两指标的最大差别是成体的ＫＷＬ 值大于的体，而成体的Ｋ值小于幼体。布氏田鼠肥满度没有性别差异；有显著的年龄差异，成体鼠 的肥满度高于幼鼠；有显著的季节变化，鼠种群春季肥满度最高，夏季降低，秋季回升；有显著的 年际变化，高数量年的肥满度高于低数量年。

When the body conditions of animals were being described, the relative fatness KWL (Weight/Length index, KWL-W/L) was shown better than the relative fatness K (K= 100W/L3). This conclusion was drawn through the theoretical analysis, the discussion bio- logical meaning and application of the two relative fatness indices, and was also based on the previous studies on the both body weight and body length in different small mammals. The most important difference between relative fatness KWL and K was that the KWL value of adult animal was higher than that of young one, but K value of adult was lower. There was no difference of relative fatness of Brandt's vole in aspect of sex. The obvious seasonal changing was that relative fatness value was shown the highest in spring, the lowest in summer and medium in autumn. The yearly variation of the relative fatness was shown itself a significant difference being positively related to the voles'population dynamics.