1. Invasive Species of the Great Lakes

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

3. 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

4. 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

5. 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

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

7. 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