Primate Conservation in Fragmented Ecosystems

Primate populations worldwide face increasing threats from the subdivision of continuous forest into isolated fragments by agriculture, infrastructure and urban expansion. Fragmentation alters habitat quality, disrupts movement and gene flow, and intensifies edge effects, often reducing food availability and increasing exposure to hunters and disease. Many arboreal species exhibit reduced home‐range sizes and altered social structures in small patches, while others may exploit modified landscapes when structural connectivity and suitable resources persist in the matrix. Fragmentation also interacts with climate change, constraining altitudinal or latitudinal shifts and reducing refugial options. Conservation strategies now emphasise landscape‐scale approaches: establishing biological corridors, improving matrix permeability through agroforestry and secondary forest management, and reinforcing protected‐area networks. Community engagement, sustainable livelihood schemes and policy frameworks that balance local development and biodiversity goals have proved critical. Integrating remote sensing, population modelling and long‐term monitoring underpins adaptive management, while restored connectivity can bolster metapopulation resilience. Given the global distribution of primates across Neotropical, African, Madagascan and Asian ecosystems, effective fragmentation mitigation carries broad ecological, cultural and socio‐economic benefits, safeguarding ecosystem services such as seed dispersal and forest regeneration.

Research from Nature Portfolio

Recent habitat suitability models indicate that Atlantic Forest primates may lose over half of their climatic envelope by 2100 under high‐emission scenarios, with range contractions exceeding 75% for many species and southward shifts of core populations. This work highlights the necessity of canopy bridges, agroecosystem buffers and restoration to facilitate movement across fragmented landscapes. Complementary analyses reveal that many primate species utilise secondary forests and tree plantations, and those tolerant of heavily modified covers exhibit more stable or increasing populations than strictly forest‐dependent taxa. These findings inform management by identifying which habitat mosaics support foraging and social cohesion, and by guiding matrix restoration to maximise functional connectivity.

Research from all publishers

A global assessment of human‐modified landscapes shows that expansion of cropland, pasture and road networks has driven declines in two-thirds of primate species, with protected and Indigenous lands serving as strong refuges for species richness. Ensemble forecasting of Amazonian ateline distributions under moderate and worst‐case climate scenarios predicts over 50% habitat loss for most taxa, while identifying western Amazonia as a critical 21st-century refugium, emphasising the role of edaphic and vegetative factors in regional persistence. A regional analysis of four primate-rich countries demonstrates that habitat loss and fragmentation rates vary with governance and agricultural drivers, with Brazil and Madagascar showing high overlap between species ranges and unprotected areas, underscoring the urgent need for integrated land-use planning and local enforcement to curb illegal hunting and forest conversion.

Primate Conservation in Fragmented Ecosystems publication trend

The graph below shows the total number of articles in primate conservation in fragmented ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Habitat fragmentation: The process by which continuous habitat is divided into smaller, isolated patches by human activities.

Matrix permeability: The degree to which the non-forest landscape allows animal movement and dispersal between habitat fragments.

Metapopulation: A group of spatially separated populations of the same species that interact through dispersal.

Edge effects: Changes in ecological conditions and species interactions that occur at the boundaries between habitat patches and altered landscapes.

Habitat suitability model: A predictive tool combining species occurrence and environmental data to map current or future distribution under different scenarios.

References

1. Human‐modified landscapes driving the global primate extinction crisis. Global Change Biology (2023).
2. Modelling 21st century refugia and impact of climate change on Amazonia's largest primates. Ecography (2024).
3. Primates facing climate crisis in a tropical forest hotspot will lose climatic suitable geographical range. Scientific Reports (2023).
4. Primates in peril: the significance of Brazil, Madagascar, Indonesia and the Democratic Republic of the Congo for global primate conservation. PeerJ (2018).
5. The conservation value of human-modified landscapes for the world’s primates. Nature Communications (2019).
6. Current and future trends in socio-economic, demographic and governance factors affecting global primate conservation. PeerJ (2020).