Forest fragmentation traps primate populations in isolated patches where inbreeding, resource scarcity, and edge effects cause progressive welfare deterioration.
Forest fragmentation creates welfare harms that accumulate gradually but are severe in their final expression. Isolated primate groups experience resource competition as patches become overcrowded relative to food availability, forcing dietary shifts toward lower-quality foods and increasing nutritional stress. Inbreeding depression reduces immune function and reproductive success. Edge effects reduce the microclimate stability and structural complexity that forest-interior primates depend on. The social disruption from population fragmentation and size reduction affects species where social complexity is itself a welfare need. Canopy bridges and habitat corridors provide a practical and cost-effective intervention that improves connectivity and reduces isolation effects, but they cannot substitute for the landscape-scale forest conservation that prevents fragmentation in the first place.