Upwelling of cold water off the Peruvian coast stops. Rates of decomposition are slow. Most nitrogen is present in dead organic matter below the ground surface. Many species are endemic to small areas of rainforest. Laterite soils are unweathered.
Birds are a excellent indicator of the adverse effects of habitat fragmentation.
The absence of large areas of pure hardwood forest. The absence of forest fires. Lack of suitable prey. Loss of species diversity. Presence of small, isolated populations.