高原鼢鼠种群年龄的研究 Ⅰ.高原鼢鼠种群年龄鉴定的主成分分析

高原鼢鼠(Myospalax baileyi)广布于青海高原,严重危害农、林、牧业。其危害程度,取决于数量,而种群数量的变动又受着年龄组成的影响。研究种群年龄的组成,为灭鼠工作的预测预报提供理论基础。

AGE INVESTIGATION OF MOLE RAT POPULATIONS I.ON PRINCIPAL COMPONENTS ANALYSIS METHOD OF THE POPULATION AGE DETERMINATIONOF MOLE RAT

The paper be based on the 761 skull of mole rat (Myospalax bailey) ♂:355,♀:406) in 1977, random sampling was males'and females'skulls 120, respectively.Each skull has 12 indexes,i.e.(1)Greatest length of skull, (2) Nasal length, (3)Premaxilla width, (4) Interorbital width, (5) Head back width, (6)Parietal crest width, (7)Frontal length, (8)Maxillary incisors length, (9)Maxillary incisors width, (10)Zygomatic width, (11)Body weight,(12)Body length in the order the random variable y₁1,y₂,y₁₂ were used to indicate. This is a 120x12 matrix of order(Y), and it was been canonicity in the collmn.After canonicity,the random variable y₁1,y₂,y₁₂ were written x₁, x₂,x₁₂,then X=(x_ij).