Buckley Cara, Nekaris K A I, Husson Simon John
Department of Anthropology, Centre for Conservation, Environment and Development, School of Social Sciences and Law, Oxford Brookes University, Oxford, UK.
Primates. 2006 Oct;47(4):327-35. doi: 10.1007/s10329-006-0195-7. Epub 2006 May 31.
Few data are available on gibbon populations in peat-swamp forest. In order to assess the importance of this habitat for gibbon conservation, a population of Hylobates agilis albibarbis was surveyed in the Sabangau peat-swamp forest, Central Kalimantan, Indonesia. This is an area of about 5,500 km(2) of selectively logged peat-swamp forest, which was formally gazetted as a national park during 2005. The study was conducted during June and July 2004 using auditory sampling methods. Five sample areas were selected and each was surveyed for four consecutive days by three teams of researchers at designated listening posts. Researchers recorded compass bearings of, and estimated distances to, singing groups. Nineteen groups were located. Population density is estimated to be 2.16 (+/-0.46) groups/km(2). Sightings occurring either at the listening posts or that were obtained by tracking in on calling groups yielded a mean group size of 3.4 individuals, hence individual gibbon density is estimated to be 7.4 (+/-1.59) individuals/km(2). The density estimates fall at the mid-range of those calculated for other gibbon populations, thus suggesting that peat-swamp forest is an important habitat for gibbon conservation in Borneo. A tentative extrapolation of results suggests a potential gibbon population size of 19,000 individuals within the mixed-swamp forest habitat sub-type in the Sabangau. This represents one of the largest remaining continuous populations of Bornean agile gibbons. The designation of the Sabangau forest as a national park will hopefully address the problem of illegal logging and hunting in the region. Further studies should note any difference in gibbon density post protection.
关于泥炭沼泽森林中长臂猿种群的数据很少。为了评估这一栖息地对长臂猿保护的重要性，在印度尼西亚加里曼丹中部的萨班高泥炭沼泽森林中对白须长臂猿种群进行了调查。这是一片面积约5500平方公里的经过选择性采伐的泥炭沼泽森林，于2005年被正式划定为国家公园。该研究于2004年6月和7月采用听觉采样方法进行。选择了五个采样区域，每个区域由三组研究人员在指定的监听点连续调查四天。研究人员记录了鸣叫群体的方位角，并估计了与它们的距离。共定位到19个群体。种群密度估计为每平方公里2.16（±0.46）个群体。在监听点看到的或通过追踪鸣叫群体获得的目击结果显示，平均群体大小为3.4只个体，因此估计长臂猿个体密度为每平方公里7.4（±1.59）只个体。密度估计值处于为其他长臂猿种群计算的值的中间范围，这表明泥炭沼泽森林是婆罗洲长臂猿保护的重要栖息地。对结果的初步推断表明，萨班高混合沼泽森林栖息地亚型内的长臂猿潜在种群数量为19000只个体。这是婆罗洲白须长臂猿现存最大的连续种群之一。将萨班高森林指定为国家公园有望解决该地区非法伐木和狩猎的问题。进一步的研究应注意保护后长臂猿密度的任何差异。
