Qualla: Juruá-Purus Moist Forests

Juruá-Purus Moist Forests: Introduction

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. The rivers are barriers here, not just passages. On one side of the Purus River, some species of primate live. On the other, subtly different subspecies of the same genus have evolved in isolation. Insects do the same thing. The rivers of the Juruá-Purus moist forests are wide enough and old enough that animals that cannot swim or fly have been separated into slightly different genetic trajectories by water. This is what it means for a place to be large and inaccessible and uninterrupted: the natural processes of speciation run to their conclusion in ways that are more difficult to observe anywhere else in the tropics. The ecoregion covers 242,681 square kilometers. No roads cross it. Not yet.

Image: Every-leaf-that-trembles | CC BY-SA 4.0

Juruá-Purus Moist Forests: Flat and Flooded

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. The ecoregion sits in the low Amazon basin at elevations between 20 meters and a few dozen meters above sea level. The terrain is flat - truly flat, with the kind of minor relief that makes even small variations in elevation hydrologically significant. Large meandering rivers thr...

Image: Every-leaf-that-trembles | CC BY-SA 4.0

Juruá-Purus Moist Forests: A Forest of 250 Species per Hectare

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. Near the town of Carauari, researchers counting tree species per hectare have logged 250. That number is high even for the Amazon. The Juruá-Purus supports more than 60 species in the Sapotaceae family alone - trees related to the sapote and the star apple, mostly canopy and unde...

Image: Every-leaf-that-trembles | CC BY-SA 4.0

Juruá-Purus Moist Forests: Primates Divided by Water

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. The rivers as barriers have produced some of the ecoregion's most distinctive fauna. Over 170 species of mammals live here. Almost 120 species alone have been recorded at one location on the upper Urucu River. Mammals that can traverse between flooded and terra firme forests incl...

Image: Every-leaf-that-trembles | CC BY-SA 4.0

Juruá-Purus Moist Forests: Birds and the Curassow Question

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. Over 550 species of birds have been recorded in the ecoregion, with many endemics. The mix includes macaws, parrots, and tanagers in their familiar Amazonian abundance - species in Amazona and Ara, genera like Tangara and Tachyphonus. The seasonal migrants come through. The non-m...

Image: Every-leaf-that-trembles | CC BY-SA 4.0

Juruá-Purus Moist Forests: What Has Not Happened Yet

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. The World Wildlife Fund classes the ecoregion as Relatively Stable and Intact, a phrase that understates the contingency of the situation. No roads cross the Juruá-Purus. That is the primary reason it remains forest. Petrobras has explored for oil and gas here for years and cut d...

Image: Every-leaf-that-trembles | CC BY-SA 4.0