Oklahoma State University
Oklahoma Invasive Species
Oklahoma State University

Welcome to the Oklahoma Invasive Species Site!


An invasive species, also referred to as non-native, non-indigenous, exotic, or an alien species, can be described as a species that does not naturally occur in a specific area and whose introduction, spread, and survival does-or is likely to-cause harm or threat to ecological, economic, or human health.


Official US government definitions regarding invasive species were provided in Executive Order 13112 signed by President Clinton on Feb. 3,1999 (http://ceq.hss.doe.gov/nepa/regs/eos/eo13112.html).


Invasive species have many characteristics that provide them with the ability to displace native species in an area. Some of these characteristics include: high reproduction rates, resistance to disturbance, lack of predators, efficient dispersal mechanisms, and the ability to out-compete native species for resources.


Many invasive species are currently threatening valuable ecosystems across the U.S., including Oklahoma. Invasive species are extremely difficult to eradicate in native areas because of the wide variety of characteristics they exhibit. The best plan of action is the prevention of new species being introduced and the control of invasive species that are already established.



  • Invasive Species: an alien species whose introduction does or is likely to cause economic or environmental harm, or harm to human health.
  • Native Species: originating, growing, or produced in a certain place or region.
  • Species: a group of closely related and interbreeding living things.
  • Ecosystem: a collection of living things and the environment or habitat in which they live.
  • Dispersal: the process or result of the spreading of organisms from one place to another.
  • Competition: the struggle among organisms, both of the same and of different species, for food, space, and other vital requirements.
  • Control: prevention of success or spread of an undesirable organism in an environment or habitat.


Click on the species name to the left to learn more.


Site Sponsored by:


College of Agricultural Sciences and Natural Resources

Natural Resource Ecology and Management Department



Natural Resources Conservation Service



Oklahoma Grazing Lands Conservation Association