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Down from the treetops: red langur (Presbytis rubicunda) terrestrial behavior
Susan M Cheyne1,2, Supiansyah3, Adul3
1Borneo Nature Foundation, Jl. Bukit Raya Induk No. 82, Palangka Raya, Indonesia. s.cheyne@borneonature.org.
Primates; Journal of Primatology
|July 21, 2018
Summary
Red langurs (Presbytis rubicunda) are observed on the ground more than previously thought, especially in disturbed Bornean forests. This terrestrial behavior may be an adaptation for feeding and travel in altered habitats.
Area of Science:
- Primatology
- Ecology
- Conservation Biology
Background:
- Red langurs (Presbytis rubicunda) are typically considered arboreal primates.
- Previous research has limited data on their terrestrial activity patterns.
Purpose of the Study:
- To investigate the terrestrial behavior of red langurs in Indonesian Borneo.
- To identify factors influencing ground use in red langurs.
Main Methods:
- Direct behavioral observations across eight sites in Indonesian Borneo.
- Camera trapping to record langur activity and behavior.
- Analysis of ground use in relation to habitat disturbance and elevation.
Main Results:
- Red langurs were observed on the ground at six of eight surveyed sites.
- Ground use was more frequent in forests disturbed by logging, fire, and hunting.
- Feeding and traveling were the primary activities when on the ground.
- Decreased ground use correlated with increased habitat elevation.
- Activity on the ground overlapped with Sunda clouded leopard (Neofelis diardi) activity periods.
Conclusions:
- Red langurs exhibit more terrestrial behavior than previously understood.
- Disturbed forest habitats may drive increased ground use for resource exploitation and movement.
- This behavior could be an adaptive strategy in response to environmental changes and predation risk.
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