Environmental and Economic Costs of Nonindigenous Species in the United States

  title={Environmental and Economic Costs of Nonindigenous Species in the United States},
  author={David Pimentel and Lori Lach and Rodolfo Z{\'u}{\~n}iga and Douglas E. Morrison},
[Extract] Aproximately 50,000 nonindigenous (non-native) species are estimated to have been introduced to the United States. Some of these are beneficial; for example, species introduced as food crops (e.g., corn, wheat, and rice) and as livestock (e.g., cattle and poultry) now provide more than 98% of the US food system, at a value of approximately $800 billion per year (USBC 1998). Other exotic species have been introduced for landscape restoration, biological pest control, sport, pets, and… 
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