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Past human influences on Amazonian forest
The marks of prehistoric human societies on tropical forests can still be detected today. Levis et al.
performed a basin-wide comparison of plant distributions,
archaeological sites, and environmental data. Plants domesticated by
pre-Columbian peoples are much more likely to be dominant in Amazonian
forests than other species. Furthermore, forests close to archaeological
sites often have a higher abundance and richness of domesticated
species. Thus, modern-day Amazonian tree communities across the basin
remain largely structured by historical human use.
Science, this issue p. 925
Abstract
The
extent to which pre-Columbian societies altered Amazonian landscapes is
hotly debated. We performed a basin-wide analysis of pre-Columbian
impacts on Amazonian forests by overlaying known archaeological sites in
Amazonia with the distributions and abundances of 85 woody species
domesticated by pre-Columbian peoples. Domesticated species are five
times more likely than nondomesticated species to be hyperdominant.
Across the basin, the relative abundance and richness of domesticated
species increase in forests on and around archaeological sites. In
southwestern and eastern Amazonia, distance to archaeological sites
strongly influences the relative abundance and richness of domesticated
species. Our analyses indicate that modern tree communities in Amazonia
are structured to an important extent by a long history of plant
domestication by Amazonian peoples.