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首页> 外文期刊>Oryx >Fragmented populations of the Vulnerable eastern hoolock gibbon Hoolock leuconedys in the Lower Dibang Valley district, Arunachal Pradesh, India
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Fragmented populations of the Vulnerable eastern hoolock gibbon Hoolock leuconedys in the Lower Dibang Valley district, Arunachal Pradesh, India

机译：印度阿鲁纳恰尔邦下迪邦河谷地区脆弱的东部长臂猿长臂猿Hoolock leuconedys的零散种群

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摘要

We conducted a survey of the distribution and population status of the eastern hoolock gibbon Hoolock leuconedys in non-protected fragmented forest areas of the Lower Dibang Valley district of Arunachal Pradesh, India, during September 2010-June 2011. We estimated the minimum population density at seven study sites by direct observation and by counting the number of vocalizations heard from groups that were out of view. We used 1-ha belt transects (500 x 20 m) to estimate tree diversity in the study area. For two groups of gibbons we recorded their feeding patterns in forest fragments, using focal individual sampling, during May 2011. A total of 54 groups and three solitary individuals were recorded: 39 groups and three individuals through visual encounter and 15 groups through vocalization recognition. The mean group size recorded was 2.89 +/- SE 0.11 (range 2-4). We counted a total of 289 trees, of 26 species and 17 families, in 18 belt transect surveys covering all non-protected fragments of the Lower Dibang Valley district. The gibbons' diet consisted of seasonal fruits and figs (29 %), leaves (65 %), seeds (2 %) and flowers (0.5 %). The major threats recorded at the study sites were habitat destruction and hunting. To protect the Vulnerable eastern hoolock gibbon, conservation measures will need to involve local communities.
机译：在2010年9月至2011年6月间，我们对印度阿鲁纳恰尔邦下迪邦河谷地区未保护的零散森林区域的东部长臂猿长臂猿Hoolock亮象科的分布和种群状况进行了调查。我们估计了最低种群密度为通过直接观察并通过计数从看不见的小组听到的发声数量来研究七个学习地点。我们使用1公顷的带状样带（500 x 20 m）估算研究区域的树木多样性。对于2011年5月的两组长臂猿，我们使用重点个人抽样记录了它们在森林碎片中的觅食模式。总共记录了54组和3个单独的个体：39个组和3个通过视觉相遇的人，以及15个通过发声识别的组。记录的平均组大小为2.89 +/- SE 0.11（范围2-4）。在18个带状样带调查中，我们统计了289棵树，有26种和17个科，覆盖了低迪邦河谷地区所有未保护的碎片。长臂猿的饮食包括时令水果和无花果（29％），叶子（65％），种子（2％）和花朵（0.5％）。研究地点记录的主要威胁是栖息地的破坏和狩猎。为了保护脆弱的东部长臂猿长臂猿，保护措施将需要当地社区的参与。

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