Feeding behavior and activity budget of the southern yellow-cheeked crested gibbons (Nomascus gabriellae) in a lowland tropical forest

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	Feeding behavior and activity budget of the southern yellow-cheeked crested gibbons (Nomascus gabriellae) in a lowland tropical forest
	Chen, Jin
刊名	AMERICAN JOURNAL OF PRIMATOLOGY
	2017
卷号	79 期号:8 页码:e22667
关键词	activity budget behavior Cat Tien National Park crested gibbon diet Nomascus gabriella
中文摘要	The southern yellow-cheeked crested gibbon (Nomascus gabriellae), an endangered species native to Vietnam and Cambodia, lives exclusively in undisturbed tropical forests and depends primarily on ripe fruit for food. Although this species is highly threatened, its ecology and conservation status remain relatively unknown. In order to understand how this heavily frugivorous primate adapts to the seasonal fluctuation of fruit resources in the forest, we collected feeding behavior and ranging activity data on one group of southern yellow-cheeked crested gibbons in Cat Tien National Park, Vietnam, over 1-year period. We compared these data to information on phenological patterns at the site gleaned during a prior study. We found that the gibbons gathered most of their food from 69 different plant species and also consumed insects and bird eggs. Fruits were the main dietary item (43.3%), followed by leaves (38.4%), flowers (11.6%), and other plant parts (6.0%). A significant seasonal shift in diet was observed; fruit generally dominated the diet in the rainy season and leaves in the dry season. The gibbons often started daily activities very early (05:10 am) in the morning and also ended quite early (16:45 pm) in the afternoon. Socializing was concentrated in the early morning, feeding had a bimodal pattern of high activity levels in mid-morning and mid-afternoon, and resting was most intense at the earliest and latest hours of the day and at midday, with proportionally less time used for traveling at these times. Averaged over the annual cycle, the gibbons spent 45% of their time feeding, 31.9% resting, 14.1% traveling, and 9.0% socializing. The percentage of time allocated to different activities varied significantly across months and between the dry and rainy seasons. Monthly variation in the activity budget was strongly related to changes in diet. In the rainy season, when the gibbons ate a higher percentage of fruit, they decreased their feeding time, while increasing traveling time in search of food; conversely, in the dry season, when they fed on a higher percentage of leaves, they decreased traveling time. Overall, our results show that the activity budget and diet of the southern yellow-cheeked crested gibbon are associated with seasonal shifts in climate. This study provides information relevant to the conservation and management of this endangered species by identifying important habitat conditions for reintroducing captive animals into the wild and providing insight into dietary needs, which may be relevant to the maintenance of animals in rescue centers.
公开日期	2017-08-02
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/10567]
专题	西双版纳热带植物园_动植物关系组
通讯作者	Chen, Jin
推荐引用方式 GB/T 7714	Chen, Jin. Feeding behavior and activity budget of the southern yellow-cheeked crested gibbons (Nomascus gabriellae) in a lowland tropical forest[J]. AMERICAN JOURNAL OF PRIMATOLOGY,2017,79(8):e22667.
APA	Chen, Jin.(2017).Feeding behavior and activity budget of the southern yellow-cheeked crested gibbons (Nomascus gabriellae) in a lowland tropical forest.AMERICAN JOURNAL OF PRIMATOLOGY,79(8),e22667.
MLA	Chen, Jin."Feeding behavior and activity budget of the southern yellow-cheeked crested gibbons (Nomascus gabriellae) in a lowland tropical forest".AMERICAN JOURNAL OF PRIMATOLOGY 79.8(2017):e22667.