长爪沙鼠种群年龄指标的主成分分析

The Principal component analysis of population age index of Mongolian gerbll

本文采用生成分分析法,对内蒙古地区长爪沙鼠的体重、体长、尾长、颅全长、颅基长、鼻骨长、腭长、上齿列长、齿隙长、听泡长、听泡宽、颧宽、眶间宽、后头高、后头宽15项指标进行了二维排序。结果表明:颅基长是长爪沙鼠雄、雌鼠最具代表性的年龄指标;简易可行指标,雄鼠为体重,雌鼠为体长,亦可用于年龄划分。

The 15 indices of Mongolian geril ( Meriones unguiculatus) were analysed by use of principal component analysis in total of 151 individuals. All analysed indices are ordinated on the first and the second principal component axis whose sum contribution rates are 62.8% to male correlation matrix and 53.8% to female one. The results shows:1. Basal skull length is the most presentable age indicator of Mnoyolian gerbil.2. Among the practial ones including body lenghth: body weight and tail length, the body weight is the best age indicator for male and the body length for female.