东北鼢鼠种群年龄结构的划分

Division of age structure of Myospalax psilurus population

依据样本体重、体长、胴体重和头骨的变化 ,对东北鼢鼠 Myospalax psilurus种群年龄结构进行了初步研究。把东北鼢鼠划分为幼体组、成体 组、成体 、老体组共 4个年龄组 ;体重、体长、胴体重及头骨特征有明显年龄变化。种群老体数量少 ,成体数量多 ,说明在该地区该种群是上升趋势。

The age structure of Myospalax psilurus pupolation was studied on the basis of the change in weight,body length,skull and so on of samples.The rodent was dividied in four groups in age,that is larva,adult Ⅰ,adult Ⅱ and old age.The weight,body length and skull have obvious change in age.There are more adults than old ages in a population.That shows the number of the population tends to go up.