Further Reflections on Amazonian Environmental History: Transformations of Rivers and Streams

Despite the increasing sensitivity of researchers to historical and contemporary landscape manipulations in the Amazon basin, there is still a powerful consensus in both popular and scholarly literatures that, with the exception of predatory deforestation, the physical environment of the region is largely unmodified by human intervention. An emerging body of scholarship has challenged this view by describing ways that Amazonian populations have managed terrestrial ecosystems on a variety of spatial and temporal scales. In this research report, we present both new and previously published data showing that Amazonians also intervene in fluvial systems, manipulating rivers and streams to modify the landscape. We argue that these practices, occurring in many different forms, are widespread and commonplace throughout the region, and that, taken together with the emerging evidence for terrestrial manipulation, provide compelling reason for a fundamental reassessment of conventional views of Amazonian nature.