Deforestation of the Amazon rainforest The completion of the roads was followed by a wave of resettlement; these settlers had a significant effect on the forest as well. Research conducted by Leydimere Oliveira et al. has shown that the more rainforest is logged in the Amazon, the less precipitation reaches the area and so the lower the yield per hectare becomes. Thus for Brazil as a whole, there is no economic gain to be made by logging and selling trees and using the logged land for pastoral purposes. A September 2016 Amazon Watch report concludes that imports of crude oil by the US are driving
Amazon biome form barriers to the geodispersal of plants, animals and even insects. Thus the white-fronted capuchin ("Cebus albifrons") and hairy saki ("Pithecia hirsuta") are found west of the Tapajós, while the white-nosed saki ("Chiropotes albinasus") is only found east of the river. The World Wildlife Fund divides the biome into ecoregions, often defined as the regions lying between major tributaries of the Amazon. Most of the interior of the Amazon basin is covered by rainforest. The dense tropical Amazon rainforest is the largest tropical rainforest in the world. It covers between of the Amazon biome. The somewhat vague numbers are because