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Cane toad. European starling. Zebra mussel. Lamprey. Purple loosestrife. Distribution and Spread:
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Distribution and Spread: • By the 1830's, L. salicaria was well established along the New England seaboard. The construction of inland canals and waterways in the 1880's favored the expansion of the plant into interior New York and the St. Lawrence River Valley. The continued expansion of L. salicaria coincided with increased development and use of road systems, commercial distribution of the plant for horticultural purposes, and regional propagation of seed for bee forage. As of 1996, L. salicaria is found in all contiguous states (except Florida) and all Canadian provinces. • Problem: • Invasion of L. salicaria into a wetland can result in the suppression of the resident plant community and the eventual alteration of the wetland's structure and function. Large monotypic stands of L. salicaria jeopardize various threatened and endangered native wetland plants and wildlife by eliminating natural foods and cover. Dense plant establishments in irrigation systems has impeded the flow of water
Introduced as an ornamental plant in the 1800’s. • Crowds out native species of trees and plants.
Used as a dye • This invader is found mostly in disturbed sites, such as range, cropland, dry areas, woodlands, and pasture sites. This a major problem because Dyers Woad overtakes native grass, and most livestock and wildlife don't graze it. Shown below is the typical habitat of our local Dyer's Woad - foothills that rise up to the east. This scene from a development near the Weber and Box Elder County lines shows how Dyer's Woad will take over when land has been cleared for development and then left alone for a time. Dyer's Woad is spread from place to place by seed, which become viable comparatively early during seed production. Fortunately, other than the sheer number of acres infested with this particular weed, it is rather benign compared to some of the other noxious weeds found in the county.
As demand for coypu fur declined, coypu have since become pests in many areas, destroying aquatic vegetation, irrigation systems, chewing through human-made items, such as tires and wooden house panelling in Louisiana, eroding river banks, and displacing native animals. Coypu were introduced to the Louisiana ecosystem in the 1930s when they escaped from fur farms that had imported them from South America.[11] Nutria damage in Louisiana became so severe that in 2005, a bounty program was in effect to aid in controlling the animal.[12] In the Chesapeake Bay region in Maryland, where they were introduced in the 1940s, coypu are believed to have destroyed 7,000 to 8,000 acres (2,800 to 3,200 ha) of marshland in the Blackwater National Wildlife Refuge. In response, by 2003, a multi-million dollar eradication program was underway.
Representatives of the genusIctalurus have been introduced into European waters in the hope of obtaining a sporting and food resource. However, the European stock of American catfishes has not achieved the dimensions of these fish in their native waters, and have only increased the ecological pressure on native European fauna. Walking catfish have also been introduced in the freshwaters of Florida, with the voracious catfish becoming a major alien pest there. Flathead catfish, Pylodictis olivaris, is also a North American pest on Atlantic slope drainages.[2]Pterygoplichthys species, released by aquarium fishkeepers, have also established feral populations in many warm waters around the world
Feral pig http://www.invasivespeciesinfo.gov/animals/wildboar.shtml
