Department of Biological Sciences, University of the Pacific, Stockton, California.
Biological Programs, Minnesota Zoological Gardens, Apple Valley, Minnesota.
Am J Primatol. 1985;8(4):299-308. doi: 10.1002/ajp.1350080405.
Kloss's gibbons (Hylobates klossii) and Mentawai langurs (Presbytis potenziani) on Siberut Island, Indonesia, both sleep in emergent trees 34-55m tall, situated on crests and upper slopes of hills. They differ in that 91% of gibbon sleeping trees examined were free of lianas, whereas 89% of langur sleeping trees were draped with thick, woody lianas hanging from the branches to the ground. Because indigenous hunters climb lianas to shoot primates in treetops, gibbons are less susceptible than langurs to nocturnal human predation. Hence, the gibbons' preference for-and apparent control of-the limited supply of vineless trees gives them an advantage over langurs.
印度尼西亚锡博雷特岛上的克洛斯氏长臂猿（Hylobates klossii）和明打威长尾猴（Presbytis potenziani）都在 34-55 米高的突出树木中栖息，这些树木位于山顶和山坡上部。它们的区别在于，在检查的长臂猿睡眠树上，91%没有藤本植物，而在长尾猴睡眠树上，89%被厚厚的木质藤本植物覆盖，这些藤本植物从树枝垂到地面。由于当地的猎人会爬上藤本植物在树梢上射杀灵长类动物，因此长臂猿比长尾猴更不容易受到夜间人类捕食的影响。因此，长臂猿对无藤本树木的有限供应的偏好和明显的控制，使它们比长尾猴更具优势。
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