金丝猴肩带和前肢的性二型

本文研究了两种金丝猴(Rhinopitheous bieti和R.brelichi)肩带及上肢的62项线性变量及指数的性二型,其中64.5%达到了显著性差异水平。结果表明,两性在运动行为上存在一些差异。在所分析的变量中,性别间的差异主要由于成熟时间的不同所引起(雄性比雌性具更长的生长时期),其次是生长速率的不同(雄性比雌性具有更明显的正异速生长率)。对一些指数及不同部位的性二型分析表明,在上肢利用和尺、桡骨的前旋及后旋活动方面,两性也具一些不同。

SEXUAL DIMORPHISM OF SHOULDER GIRDLE AND UPPER LIMB IN RHINOPITHECUS

In this paper, 66 variables of shoulder girdle and upper limb in golden monkeys (Rhino-pithecus) were studied on sexual dimorphism.64.5% of them approach to significant difference level, and some differences on locomotion exist between two sexes of Rhinopithecus, Most of the variable differences studied here are primarily caused by the different growing time (time hypermorphosis), However, for a few dimensios, rate of hypermorphosis (males' dimension have significantly possitive allometric slope than do females') is still playing an additional role following the body increasig. Considering some indices on the shoulder girlde and upper limb in Rhinopithcus, we hypothesize that female spend more time than do male in climbing in the trees (arboreal). This supports the suggestion indicated by Stern (1983) and Schaller (1964). The sequent pattern of average sexual dimorphism on the shoulder girdle and upper limb is well understood by the difference of raising, supination Pronation of upper limb and by the moderate body size sexual dimorphism (Pan et al., in press) also by similar geometric pattern shape of researched bones between sexes.