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首页> 外文期刊>Ecological research >Effects of water level on sleeping-site selection and inter-group association in proboscis monkeys: why do they sleep alone inland on flooded days?
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Effects of water level on sleeping-site selection and inter-group association in proboscis monkeys: why do they sleep alone inland on flooded days?

机译：水位对长鼻猴睡眠位点选择和群体间关联的影响：为什么它们在水淹天独自在内陆睡眠？

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A one-male group (BE-Group) of proboscis monkeys was studied along the Menanggul River, a tributary of the Kinabatangan River, Sabah, Malaysia, from May 2005 to 2006. It has generally been assumed that proboscis monkeys only set up their sleeping sites along the riverbank; however, when more than 1 m of water covered the forest floor for more than 700 m inland from the riverbank during the seasonal flood, the BE-Group slept inside the forest. It seems that the sleeping-site selection of the BE-Group was not influenced by food availability during the flooded months because the food availability by the vegetational survey did not vary much between flooded and non-flooded months. In addition, feeding behaviors of the focal monkey in the BE-Group also did not vary much between flooded and non-flooded days. On the other hand, the water level statistically influenced the sleeping-site selection. The proboscis monkeys remained in inland forest during the flooded days because of the reduced predation threat, as terrestrial predators such as clouded leopards are prevented from foraging by deep water covering the forest floor. On non-flooded days when the BE-Group slept at the riverbank, they frequently slept close to other one-male groups on the riverside trees. Contrastingly, when the group slept inside the forest on flooded days when the water level was high, they sleptrnaway from other groups. This difference in the need for one-male groups to sleep close to each other might be attributed to the decreased predation threat during high water level in the flooded days.
机译：2005年5月至2006年，在马来西亚沙巴Kinabatangan河的支流Menanggul河上研究了一个雄性长鼻猴（BE-Group）。通常认为，长鼻猴只会睡觉沿河沿岸的遗址；但是，在季节性洪水期间，当超过1 m的水覆盖了河岸内陆700 m以上的林地时，BE-Group便进入了森林内部。似乎BE-Group的就寝地点选择不受水灾月份食物供应量的影响，因为根据植被调查得出的食物供应量在水灾和非水灾月份之间变化不大。此外，BE组的重点猴子的进食行为在水淹天和非水淹天之间也没有太大变化。另一方面，水位在统计学上影响了睡眠地点的选择。由于掠食威胁的减少，长鼻猴在水灾期间仍留在内陆森林中，因为覆盖森林地面的深水阻止了陆生食肉动物（如云豹）觅食。在无水的日子里，BE集团在河岸睡觉，他们经常睡在河边树木上的其他单雄群附近。相反，当该小组在水位高的洪水天在森林里睡觉时，他们便与其他小组一起睡了。单身男性需要彼此靠近睡觉的这种差异可能归因于洪水期间高水位期间捕食威胁的减少。

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