目标物直径对笼养川金丝猴和北豚尾猴抓握行为的影响

Influence of target diameters on grasping behavior in captive Sichuan snub-nosed monkeys and northern pig-tailed macaques

为了深入探究灵长类手部的进化历程,以笼养川金丝猴(Rhinopithecus roxellana)和北豚尾猴(Macaca leonina)为研究对象,选用3种直径不同的人工实验测试物,分析测试物直径大小对两物种抓握行为种类表达的影响,探寻两物种间抓握行为的异同点.结果表明:面对各种实验测试物,川金丝猴和北豚尾猴共表现出15种抓握方式,其中前者共表现出13种抓握方式,后者共表现出12种抓握方式,两物种共表现出10种相同的抓握方式.两物种所表现出的抓握类型种类数均不存在显著差异.川金丝猴和北豚尾猴在大号和中号测试物任务中使用频率最高的均为力量型抓握方式,在小号测试物任务中使用频率最高的均为精确型抓握方式.

To intensively explore the evolution of primate hand,captive Sichuan snub-nosed monkeys(Rhinopithecus roxe-llana)and northern pig-tailed macaques(Macaca leonina)were selected as focal species.Three kinds of artificial test objects with different diameters were adopted.The influence of target diameters on the expression of grasping behaviors for each species was analyzed,and the interspecific consistency and inconsistency of grasping behavior were studied.Totally R.roxellana and M.leonina showed 15 grasping patterns,in which the former showed 13 grasping patterns while the latter showed 12 grasping patterns.Two species showed 10 same grasping patterns.There was no significant interspecific difference in the number of grasping patterns.For both species,power grip was the most frequently used pattern for large and medium ball tasks while precision grip was the most frequently used pattern for the small ball task.