关键词: 太行山猕猴, 面部相似性, 分块主成分分析, 个体识别

Abstract: From April to August in 2012,a target troop (named as WW - 1) of Taihangshan macaques (Macaca mulatta tcheliensis)was investigated for facial similarity in the Tiantanshan area (35°05′ -35°15′ N,112°12′ - 112°22′ E)of the Taihangshan Macaque National Nature Reserve (TMNNR)in Jiyuan,China. Facial close-up photos of 26 individuals over 3-years-old belonging to 3 matrilineal units within troop Wangwu-1 (WW - 1)were photographed and facial similarity values between every two different individuals were analyzed using modular principal component analysis (MPCA)method. We aimed to find the correlation between facial similarity and individual kinship. The results showed that:(1) facial similarity was significantly associated with kinship between individuals;the facial similarity between mothers and offspring(0. 93 ± 0. 00)was significantly higher than those of the intra-unit group (0. 89 ± 0.00)and the inter-unit group (0. 84 ±0.01);the similarity value of the intra-unit group is significantly higher than the inter-unit group;and (2)individual face features varied with increasing age in Taihangshan macaques;higher facial similarity was found between≥4 year old individuals and their mothers (0.88 - 0. 95),and mother-offspring relationship could be assuredly recognized via this value.The results from this study may provide reasonable and effective methods for individual identification in nonhuman primates

Key words: Facial similarity, Individual identification, Modular principal components analysis (MPCA), Taihangshan macaques (Macaca mulatta tcheliensis)