Comparative study of gut microbiota diversity in captive vs. wild primates and its implications for nutrition and health in conservation programs

Project Abstract

Gut microbiota diversity and composition were analyzed in captive and wild primates to assess how captivity influences microbial ecosystems and the downstream effects on nutrition, health, and conservation outcomes. Using high-throughput 16S rRNA gene sequencing, fecal samples were collected from three representative primate species across multiple geographic regions, with balanced sampling for age, sex, and diet. Alpha diversity metrics (Shannon, Simpson, Faith’s phylogenetic diversity) and beta diversity (Bray-Curtis, UniFrac) revealed that wild populations harbored significantly higher microbial richness and evenness compared to captive groups, while beta diversity indicated distinct community structures driven by dietary inputs, environmental exposure, and social behaviors. Taxonomic profiles showed enrichment of fibrolytic and acid-tolerant taxa (e.g., Prevotellaceae, Ruminococcaceae, and Lachnospiraceae) in wild primates, whereas captive individuals exhibited higher relative abundance of starch-degrading and stress-associated taxa (e.g., Bacteroidaceae, Succinivibrionaceae) likely reflecting processed diets, reduced foraging variability, and environmental microbial constraints. Functional inference via PICRUSt2 suggested divergent metabolic potential, with wild primates displaying pathways enriched for complex plant polysaccharide degradation, short-chain fatty acid production, and secondary bile acid metabolism, while captive primates showed enrichment in carbohydrate metabolism and simple sugar utilization pathways. Correlative analyses linked microbial profiles with nutritional biomarkers, including metabolomic signatures of short-chain fatty acids, bile acids, and amino acid metabolites, as well as gross and hematological health indicators. Notably, captive primates exhibited lower fecal butyrate concentrations and altered bile acid pools, correlating with signs of gastrointestinal inflammation and reduced gut barrier integrity in some individuals. Multivariate models identified diet quality, fiber content, enrichment complexity, and exposure to environmental microbiota as primary drivers of microbiome variation, surpassing host phylogeny and age effects. Longitudinal follow-ups demonstrated partial microbiome convergence when captive diets were enhanced with natural forage components and environmental enrichment, underscoring the plasticity of gut ecosystems in response to management practices. The study discusses implications for conservation programs, emphasizing the role of microbiome-aware husbandry, dietary optimization, and rehabilitative strategies that simulate natural foraging and microbial exposure to bolster nutritional health, immune resilience, and stress coping in rehabilitated or captive-bred primates. Recommendations include integrating routine fecal microbiome monitoring, implementing diet plans that preserve fermentative microbial ecology, and designing habitat designs that promote ecological feeding behaviors. The findings contribute to a nuanced understanding of how captivity reshapes gut microbial ecosystems and highlight actionable pathways to improve health outcomes and reintroduction success through microbiome-informed conservation management.

Project Overview

What This Project Is About

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A plain-language overview of the topic and what the project investigates.

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The Problem It Addresses

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What problem or gap this project tackles and why it matters to the field or society.

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Objectives of the Project

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1. Identify differences in gut microbiota between captive and wild primates.
2. Explain how these differences relate to diet, health, and nutrition.
3. Assess potential risks to health from captivity-associated microbiota changes.
4. Suggest management practices to support healthy gut microbiota in captive populations.

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What You Will Do Step by Step

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1. Review basic literature on gut microbiota and primate diets.
2. Collect non-invasive samples (e.g., fecal) from captive and wild primates with ethical approvals.
3. Extract DNA and perform sequencing to identify microbial communities.
4. Analyze data to compare diversity and abundance of key microbial groups.
5. Correlate microbial patterns with dietary records and health indicators.
6. Interpret results in the context of conservation and welfare.
7. Discuss limitations and propose improvements for captive nutrition.

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Expected Outcome

Anticipated findings include clear differences in microbiota diversity linked to diet and environment, with practical recommendations for improving diet and housing to promote gut health in captivity.