Colobine forestomach anatomy and diet

Area of Science:

• Primate anatomy
• Gastrointestinal physiology
• Microbiome research

Background:

• Colobine monkeys possess complex foregut-fermenting stomachs with three (tripartite) or four (quadripartite) chambers.
• The praesaccus, a fourth chamber in quadripartite stomachs, has proposed functions lacking strong evidence.

Purpose of the Study:

• To investigate the functional significance of the praesaccus in colobine monkeys.
• To explore the relationship between stomach morphology and dietary adaptations.

Main Methods:

• Literature data on colobine diets were collated.
• Dietary niches of tripartite and quadripartite colobine species were compared.

Main Results:

• Quadripartite species show a higher reliance on leaves as fallback foods.
• Tripartite species exhibit a greater reliance on fruits and seeds during peak availability.
• The praesaccus appears to be an adaptation for a diet rich in leaves.

Conclusions:

• The praesaccus facilitates survival on high-fiber, leaf-based diets.
• Stomach complexity in colobines reflects adaptation to specific dietary niches and food availability patterns.