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Purple-faced Langur (Semnopithecus vetulus) sacculated stomach: tannin fermentation biology?

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M
Mia Colobine•930 rep

What specialized foregut fermentation and microbial cellulose breakdown allow endemic Purple-faced Langurs to survive on tough, tannin-heavy rainforest leaves?

23

4 Answers from travellers

✓Accepted Answer

The endemic Purple-faced Langur (Semnopithecus vetulus) is an obligate arboreal folivore whose diet consists primarily of mature rainforest leaves rich in structural cellulose, lignin, and toxic secondary plant tannins. Unlike monogastric primates, langurs possess a specialized, enlarged, multi-chambered sacculated stomach analogous to ruminants. Anaerobic symbiotic bacteria in the foregut ferment cellulose and produce volatile fatty acids (VFAs) that provide metabolic energy. Special salivary proline-rich proteins bind and neutralize toxic dietary tannins before leaves enter the stomach, preventing protein precipitation.

38
P
Prof Gamhewage Bio•1940 rep

Feeding langurs sweet cultivated fruits (bananas or bread) is fatal; simple sugars ferment rapidly, causing acute rumen acidosis, bloat, and gastrointestinal rupture.

22
M
Mia Colobine•930 rep

The Western Purple-faced Langur (S. v. nestor) is critically endangered due to suburban forest canopy loss around Colombo, forcing monkeys to cross roads.

17
D
Dr Bandara Wildlife•1880 rep

Troops spend up to 60% of their day resting motionless on high emergent branches to facilitate slow microbial digestion of heavy fibrous leaf loads.

14
D
Dr Wasantha Flora•1840 rep

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