Exercise 3.2: Bioinvasion and Predation

1. A beaver decides to build a dam in a forested area such as Long Lake, Cypress Hills, Alberta. What type of impact would the dam have?

a) Positives as a result of the beaver dam --->

b) Negatives as a result of the beaver dam --->

2. Where do zebra mussels originate from?

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3. How did they get to the Great Lakes?

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4. What year was the mussel introduced to the Great Lakes?

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5. How expensive was the 1995 zebra mussel interference to large water users on the Great Lakes?

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6. How may the introduction of a non-native plant species affect an ecosystem?

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Go to the websites listed below to answer these questions:
http://www.hww.ca/en/wildlife/mammals/raccoon.html

http://www.invadingspecies.com/invaders/plants-terrestrial/purple-loosestrife/

7. Explain why raccoons are considered undesirable.

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8. Explain how purple loosestrife is controlled in Ontario?

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