What is an Invasive Species?
Any species that is non-native to the ecosystem under consideration and whose introduction causes or is likely to cause economic or environmental harm or harm to human health. These non-native species aggressively compete with and displace the associated flora and fauna communities.
This definition is based on the definition of invasive species as written in Executive Order 13112 and clarified in “Invasive Species Definition Clarification and Guidance White Paper”, submitted by the Definitions Subcommittee of the Invasive Species Advisory Committee (ISAC) and approved by ISAC April 27, 2006.
Where Do They Come From?
Species which have become invasive often come from areas which have climates similar to our own. Many invasive species which are a problem in the United States originated in South America, Asia, Europe, Australia and Africa.
How Did They Get Here?
Some species were introduced accidently in packing material, as crop contaminants, in shipping containers or from the cargo holds of ships. But many invasive plants have been brought here deliberately. Only a small portion of non-native species are invasive. We rely on non-native plants for food, for their beauty as ornamentals in our gardens, for their usefulness in feeding wildlife, and enhancing our environment.
Why Should I care about Invasive Species?
Below are several links which each address the question, "Why should I care about invasive species?" from different perspectives.
