1. How Introduced Species affect Ecosystems
3.3

2. Agenda 3.3 Notes BBC Video on pythons Video on Sea Lamprey
Work on review package 3.3
Work on review package
Work on Practice Problems

3. Native Species Organisms that naturally inhabitant a given area
For example: “Cattails” at Lily Lake in Merrit

4. Introduced Species Non-native organisms that enter a new ecosystem
Can be distributed by people, intentionally or by accident.

5. Introduced Species
These species are typically harmless, or sometimes beneficial.
i.e. loosestrife-eating beetle

6. Invasive Species Ex. Purple Loosestrife Harmful introduced species
Can take over the habitat of native species
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Ex. Purple
Loosestrife

7. Invasive Species Why are they so harmful? Have no predators
Could aggressively compete (negatively affect native species)
Reproduce quickly

8. Invasive Species Invasive species can weaken ecosystems
Make them more susceptible to disease and parasitism by micro-organisms
Some invasive species can change, both physically and chemically, the make up of an ecosystem = Habitat alteration!

9. | Purple Loosestrife: Cattails: Invasive Species Native Species
Loosestrife eating beetle:
Introduced Species