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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
Address:College of Life Sciences, Sichuan University, No.29, Wangjiang Road, Chengdu, Sichuan Province, 610064, China
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Your Position :Home->Past Journals Catalog->2010 Vol.29 No.3

Principal Component Analysis of Age Indices of the Mole Shrew (Anourosorex squamipes)
Author of the article:SHEN Yue-wu1, 2, YANG Jun-bao1, LIU Yun1, LIANG Su-hua1*, HU Jin-chu2*
Author's Workplace:(1. Biology Teaching and Research Laboratory, North Sichuan Medical College, Nanchong 637100, China; 2. Institute of Rare Animals and Plants, China West Normal University, Nanchong 637100, China)
Key Words:mole shrew (Anourosorex squamipes);principal component analysis (PCA);age indices
Abstract:This article was aimed to analyze both the growth characteristics of Anourosorex squamipes and the validity of the growth indices for identification of age groups. From March 2005 to February 2006, 929 specimens were collected from the suburb of Nanchong, Sichuan. The authors measured these specimens for growth indices including body weight, body weight excluding viscera, and body length, while 267 intact skulls were randomly selected (121 ♂♂, 146 ♀♀) to be measured for indices, such as profile length, basal length, neurocranium width, length of tooth row, braincase height, length of mandible including the first incisor. The method of principal component analysis was employed to compare the previous indices of the male group to these of the female groups. The result showed: profile length (PL), basal length (BL) and length of mandible including the first incisor (LMIFI) in males and females were the important component factors for age identification in males and females. Body weight excluding viscera (BWEV) in males and body weight (BW) in females are more dominant factors than other character indices; body length (BOL) was the least important indicators for age identification of A. squamipes. Additionally, the second principal component values in both males and females were greater than 1, which mainly reflected lateral and triaxial growth at height of the braincase (HB) and weight excluding viscera. Body weight excluding viscera (BWEV) was chosen as a dominant index of age identification for A. squamipes. Using K-means Cluster of body weight excluding viscera, the 929 individuals(434 ♂♂495 ♀♀) were divided into four groups (♂Ⅰ 11~18g, Ⅱ 18.5~22.5g, Ⅲ 23~27g, Ⅳ 27.5~34; ♀Ⅰ12~19.5, Ⅱ 20~24.5, Ⅲ 25~30g, Ⅳ 30.5~38).
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