How different were their social structures? First of all, the macaque population density on Yakushima was twice that of those on Kinkazan. Assuming that this is due to the high abundance of food resources on Yakushima, the group size would also be expected to be larger on Yakushima. However, the Yakushima macaques form smaller groups than those on Kinkazan. In addition, the sex composition of the group is more male-biased on Yakushima than it is on Kinkazan.
■References (Books, papers, Web articles, etc.)
『ニホンザルの自然社会―エコミュージアムとしての屋久島』 高畑由起夫・山極寿一編 （京都大学学術出版会、2000）
『サルと歩いた屋久島』 山極寿一 （山と渓谷社、2006）
『野生ニホンザルの研究』 伊沢紘生 （どうぶつ社、2009）
「日本の霊長類——ニホンザル研究の歴史と展望」 山極寿一 （『日本の哺乳類学２．中大型哺乳類･霊長類』所収 pp. 29～49. 高槻成紀・山極寿一編 （東京大学出版会、2008））
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