Some External Characters of the Japanese Monkeys (Macaca fuscata)

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  • ニホンザル生体にみられる外形特徴について
  • ニホンザル セイタイ ニ ミラレル ガイケイ トクチョウ ニ ツイテ

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Abstract

Labolatory of Physical Anthropology, Kyoto University Forty-two external (non-metrical) characters were investigated in 1799 Japanese monkeys of 9 local populations (Yakushima, Koshima, Takasakiyama, Shodoshima, Arashiyama, Hakone, Boso, Shigakogen, and Shimokita).<br>The incidences of these characters are analyzed with special references to their age and sex. Also the inter-side, inter-limb (between hands and feet), inter-character correlations and those between mothers and offspring are examined. The usability of these characters for inter-population comparisons are discussed.<br>1) External characters become multiform on the early developmental stages of the Japanese monkeys, and most of them show sex differences in the ages of their emergences. I group the characters into 3 groups on the basis of the age/incidence patterns (see Fig. 2), and choose the available age class of each character corresponding to these patterns in order to use them for inter-population comparisons.<br>2) Twenty-two out of the 42 characters show significant sex differences.<br>3) Significant inter-side and inter-limb correlations are shown in all characters except for "Deficient pigmentation of nail ".<br>4) Significant inter-character correlations are shown on 9 pairs of the 11 characters in males and 10 pairs of the 16 characters in female.<br>5) Significant correlations between mothers and offspring are shown in 13 out of the 20 characters. The characters showing high correlations at 0.10 level (which are examined in only females) are more in the characters with low sex differences than those with high sex differences.<br>6) Significant inter-subspecies differences between Macaca f uscata fuscata (Arashiyama population) and Macaca fuscata yakui are shown in 14 out of the 20 characters.<br>If external characters are treated cautiously, considering the above-mentioned results, they<br>are usable for inter-population comparisons.

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