Qualla: Purus-Madeira Moist Forests

Purus-Madeira Moist Forests: Introduction

Fri, 06 Mar 2026 00:00:00 GMT

In the 1970s, Brazil paved a highway from Humaita to Manaus, cutting straight through 17.4 million hectares of lowland forest between the Purus and Madeira rivers. The road was BR-319, and the forest won. The pavement cracked, the jungle reclaimed the shoulders, and the highway was eventually closed -- impossible to maintain against an ecosystem that floods annually, dissolves asphalt, and has been quietly evolving in isolation for millions of years. The Purus-Madeira moist forests ecoregion still stands, classified by the World Wildlife Fund as "Relatively Stable/Intact," a rare designation in an Amazon increasingly defined by what has been lost.

Purus-Madeira Moist Forests: An Island Made of Rivers

Fri, 06 Mar 2026 00:00:00 GMT

The Purus-Madeira moist forests are bounded not by mountains or coastlines but by water. The Purus River forms the western edge, the Madeira the eastern, and the Solimoes -- the upper Amazon -- closes the triangle to the north. Each of these rivers is large enough to function as ...

Purus-Madeira Moist Forests: The Canopy and What Lives Beneath

Fri, 06 Mar 2026 00:00:00 GMT

In the northern reaches of the ecoregion, the forest canopy rises to 30 meters, with emergent trees pushing up to 45. The understory is dense, tangled, and dim. Further south, the canopy opens and the understory thins until, at the extreme southern edge, moist forest gives way to...

Purus-Madeira Moist Forests: Primates, Predators, and 572 Species of Bird

Fri, 06 Mar 2026 00:00:00 GMT

The isolation that defines the Purus-Madeira ecoregion has produced extraordinary endemism. Among the 165 mammal species recorded here, three species of titi monkey are found nowhere else: Hershkovitz's titi, the ashy black titi, and the collared titi. The bare-eared squirrel mon...

Purus-Madeira Moist Forests: Flat, Hot, and Vulnerable

Fri, 06 Mar 2026 00:00:00 GMT

The World Wildlife Fund's "Relatively Stable/Intact" assessment comes with a significant caveat. The southern edge of the ecoregion, where the Trans-Amazonian Highway crosses from Humaita to Labrea, has already lost forest to pasture and agriculture. Controlled and uncontrolled f...