Deforestation in Amazonia is eliminating wild genepools of many crop-plants. Wild or spontaneous populations of at least 50 perennial crops are at risk, including the Rubber tree and Cacao, as well as several crops emerging from relative obscurity, such as Peach-palm (which is now being planted extensively for palmito production), Annatto (which produces a natural red dye), and Brazil-nut.
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Smith et al. (1990) studied this question.
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