Nonnative species are also referred to as introduced, exotic, or alien species. The National Park Service defines nonnative as species that occur in a given place as a result of direct, indirect, deliberate, or accidental actions by humans. Plant species that are brought into an area as food, fiber, or ornamental landscape plantings can "jump the fence" and become established in the wild.
Likewise, nonnative animal species can be introduced into an area deliberately, for agricultural use or fish stocking; or by "hitching a ride" on objects like boat hulls and outboard motors. Many species find their way to new locations in crop seed, soil or nursery stock.
Although many introduced species have had a negative impact on our society, primarily in agriculture, these species would not have evolved with the native species and therefore are not a natural component of the ecological system. In extreme cases, invasive nonnative species can displace native species, thereby degrading the integrity and diversity of native communities. Alien species can also become pests, such as Asian lady beetles and zebra mussels.
Silver and Bighead (Asian) Carp, AKA silverfin - These plankton feeders were imported to clear the water in aquaculture and settling ponds. Escaped, they have flourished and spread, taking resources form native species. They have become popular targets for bowfishing and, as an entirely different species from the common grass carp, are excellent eating. Help control invasive species; eat Silverfin!
These mussels are present in the Wild & Scenic designated stretches of the Missouri. For this reason, it it essential that any and all boats and trailers coming off the river be properly washed and/or dried before launching in uncontaminated waters.
There are currently about 8 nonnative plant species being targeted for action within the MNRR that are of high management concern. These include:Purple loosestrife - although beautiful, is a noxious weed, well known for its capacity rapidly to invade wetlands, replace native vegetation and dominate those habitats at the expense of turtles, birds and other animals.
Guide to common invasive plants of the Northern Great Plains including Missouri National Recreational River.
Last updated: February 4, 2020