Invasive Species of the Great Lakes

Invasive Species Species elsewhere transported beyond native range Introduced (=Alien) escape, reproduction beyond cultivation Established spread and cause harm to ecosystem Invasive

Invasive species An alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health. Clinton’s Executive Order #13112

Characteristics of Invasive Species High reproductive rate Tolerant of poor habitat Facultative habitat requirements Pollution tolerant Facultative forage requirements Often found in disturbed habitats Aggressive behavior

Major events that allow invasive species Removal of natural barriers waterfalls, wetlands, land barriers Development of larger and faster transatlantic vessels- ships cross 2 weeks, ballast water dumping Water quality improvements environmental regulation of pollution improved habitat quality

Invasive spread in U.S. Recreational boats anglers Minnows in bait tank Locks and canals Barges Boat hulls Exotic fruits and plants

Why are they bad? Infest beaches Clogs pipes Predation on native fish larvae and eggs Changes in plankton Affect water clarity and vegetation Compete with native species for food and space