Human impact on western Amazonian forests was likely small and localized
In short: Researchers analyzing soil samples from 55 different sites across central and western Amazonia found that pre-Columbelse human occupation was relatively sparse. The study observed very little charcoal and a notable absence of plant remains associated with farming or forest disturbance in the soil layers from that era.
By examining soil compositions, the team could assess how much ancient populations modified the landscape. While parts of the eastern Amazon show evidence of heavy human modification, these findings suggest that western interfluvial forests experienced much less frequent and widespread human activity. However, the study's scope was limited to the specific sites surveyed.
Why it matters: Ancient human presence in the western Amazon was much less widespread than in the eastern basin.
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Sources
- Summary by Intellect · source: Research: McMichael et al. (2012). Sparse Pre-Columbian Human Habitation in Western Amazonia. Science.
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