白马雪山自然保护区格花箐滇金丝猴夜宿地的季节性选择

2005年9月至2006年9月,在白马雪山自然保护区南端的格花箐,对一群(约250只)滇金丝猴的夜宿地选择与利用情况进行调查.整个调查历时13个月,确认研究群的夜宿点54个,共记录夜宿地的利用次数137次,提示研究群在其中一些地点多次夜宿.滇金丝猴夜宿地在平均海拔分布上存在明显的季节性差异:夏季猴群夜宿地的平均海拔为3 352 m,为一年中夜宿地分布最高的时期;春季猴群则多选择在低海拔地区夜宿,平均海拔在一年中最低(3 082 m).猴群夜宿地集中分布于3 200～3 400 m的海拔范围,随季节变化,不同海拔梯度上的夜宿地数量和利用频次差异明显.虽然猴群夜宿地主要位于针阔混交林中,但是不同季节猴群夜宿地植被的组成明显不同.猴群明显偏好在位于南坡面和西坡面的地点过夜,在夏季和秋季尚未发现北坡向的夜宿地.研究还表明,不同季节,猴群都会不同程度地在少数几个地点多次过夜,但大多数夜宿地在一年中仅利用一次.滇金丝猴为什么会对某些地点多次利用尚需进一步研究证实.

Seasonal selection of sleeping sites in Yunnan snub-nosed monkeys (Rhinopithecus bieti) at Gehuaqing in Baimaxueshan Nature Reserve

Data on seasonal selection and use of sleeping sites of a group of Yunnan snub-nosed monkeys (Rhinopithecus bieti) at Gehuaqing in Baimaxueshan Nature Reserve were collected from September 2005 to September 2006. Fifty-four sleeping sites were identified and were used 137 nights during the 13 months investigation. Altitudinal distributions of investigated sleeping sites were significantly seasonal for our study group.Sleeping sites mainly distributed at a belt of 3 200 -3 400 m ( ASL)that confined in the conifer and broadleaf mixed forest.The monkeys slept at night at the highest average elevation of 3 352 m in summer and at the lowest 3 082 m in spring. The monkeys preferred to stay at the west-faced and south-faced slopes at night, but avoided sleeping at north-faced slopes at night in summer and autumn. Some sleeping sites were repeatedly used when the group passed by and most sleeping sites were slept only once during the whole study period. Why the monkey group only repeated at some sleeping sites need further study.