Invasive Species: Background Information
Non-native species are brought into North America for a number of reasons. For example, 98% of the US food supply, including wheat, rice, domestic cattle, and poultry, comes from introduced plants and animals. However, one of the biggest ecological problems in North America is the introduction of non-native species that later become weeds or pests. About 10 percent of the non-native species introduced to North America are able to survive and become established. Of these, roughly one in every 10 species that becomes established in a new region becomes a serious pest. These non-native species invade gardens, agricultural fields, and natural areas such as wetlands, forests, and grasslands. They cause substantial harm to desirable plants, animals, and entire ecosystems, as well as economic losses estimated at billions of dollars per year.
For more information, visit our invasive species links.