Invasive Species Impacts

Ecological Impacts


One of the single largest threats to our nation's natural resources, invasive species:

  • Decrease biodiversity
  • Put endangered and threatened species at further risk. In fact, invasive species are the second leading cause of animal population decline and extinction worldwide
  • Displace native plants that wildlife and fish depend on for food
  • Increase soil erosion and can cause major damage to streams and other wetland areas that provide habitat for native fish, plants, and animals
  • Increase the frequency and risk of wildfires
  • Reduce agricultural production and property values.


NatureServe: Invasive Species Issues
Protect Your Waters: Aquatic Nuisance Species Impacts
Habitattitude: Impacts of Invasive Fish and Aquatic Plants
USFS Pacific Northwest Research Station: Invasive Species Impacts Overview
UN Food and Agriculture Organization: Impacts on Forests and Forestry


Articles and Publications

Impacts of Invasive Species on Ecosystem Services

H. Charles and J.S. Dukes | 2007

The Impact of Invasive Species

PBS Nova | 2003

100 of the World's Worst Invasive Alien Species

Invasive Species Specialist Group | 2004

America's Silent Killer: How Invasive Species Threaten America's Unique Wildlife Heritage
Environmental Impacts of Marine Exotics

J.T. Carlton | 2004

Economic Impacts


US Fish and Wildlife Service: The Cost of Invasive Species
National Invasive Species Information Center: Economic Impacts of Invasive Species
Invasive Species Cost Calculator
USDA Economic Research Service: Invasive Species Issues

Articles and Publications

Managing Invasive Species: How Much Do We Spend? (Alaska)

T. Schworer, R. Federer, and H. Ferren | 2012

The Economics of Invasive Species

C. Cusack, M. Harte, and S. Chan | 2012

Economic Impacts of Invasive Species in the Pacific Northwest Economic Region

PNWER Invasive Species Working Group | 2012

Invasive Exotic Animals Costing US Billions of Dollars

J. Davis | 2010

Invasive Plants: Their Role in Species Extinctions and Economic Losses to Agriculture in the USA

D. Pimentel | 2009

Economic Costs of Delaying Invasive Weed Control: An Illustration Based on Nevada's Tall Whitetop Initiative, 2008

M. Eiswerth, W. Johnson, S. Lewis, and L. Hughes | 2008

Annual Losses to Great Lakes Region by Ship-borne Invasive Species at Least $200 Million, 2009

D. Lodge and D. Finnoff | 2008

Plant, Animal, and Microbe Invasive Species in the United States and World

D. Pimentel, M. Pimentel, and A. Wilson | 2007

Environmental Consequences and Economic Costs of Alien Species

D. Pimentel | 2005

Update on the Environmental and Economic Costs Associated with Alien-Invasive Species in the US

D. Pimentel, R. Zuniga, and D. Morrison | 2005

An Annotated Bibliography on the Economics of Invasive Plants, 2004

S. Stutzman, K.M. Jetter, and K.M. Klonsky | 2004

Economic Effects of Invasive Weeds on Land Values (from an Agricultural Banker's Standpoint)

C. Weiser | 1997