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"ENVIRONMENTAL AND ECONOMIC COSTS
ASSOCIATED WITH NON-INDIGENOUS SPECIES IN THE UNITED
STATES
David Pimentel, Lori Lach, Rodolfo
Zuniga, and Doug Morrison
College of Agriculture and Life Sciences
Cornell University
Ithaca, NY 14850-0901
June 12, 1999
phone: (607) 255-2212
fax: (607) 255-0939
email: dp18@cornell.edu
ABSTRACT
Invading non-indigenous species in the United
States cause major environmental damages and losses adding up
to more than $138 billion per year. There are approximately 50,000
foreign species and the number is increasing. About 42% of the
species on the Threatened or Endangered species lists are at risk
primarily because of non-indigenous species.
In the history of the United States, approximately
50,000 non-indigenous (non-native) species are estimated to have
been introduced into the United States. Introduced species, such
as corn, wheat, rice, and other food crops, and cattle, poultry,
and other livestock, now provide more than 98% of the U.S. 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 food processing.
Some non-indigenous species, however, have caused major economic
losses in agriculture, forestry, and several other segments of
the U.S. economy, in addition to harming the environment. One
recent study reported approximately $97 billion in damages from
79 exotic species during the period from 1906 to 1991 (OTA 1993).
Estimating the full extent of the environmental
damages caused by exotic species and the number of species extinctions
they have caused is difficult because little is known about the
estimated 750,000 species in the United States, half of which
have not even been described (Raven and Johnson 1992). Nonetheless,
about 400 of the 958 species that are listed as threatened or
endangered under the Endangered Species Act are considered to
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