1. Bell Ringer
What types of community interactions among organisms help shape ecosystems?

2. What shapes an ecosystem?
4.2

3. The Niche Food organism eats Physical conditions needed for survival
When & where it reproduces
No two species can share the same niche in the same habitat but different species can have similar niches

4. Competitive exclusion principle- no two species can occupy the same niche/same place/same time

5. Barnacles

8. Community interactions
1. Competition
2. Predation
3. Symbiosis
Mutualism
Commensalism
Parasitism

9. Community interactions
Competition
when organisms compete for the same resources
Competition activity
Need two volunteers
Colored marshmallows

10. Community Interactions
2. Predation one organism captures & feeds on another

11. Community interactions
3. Symbiosis---two different species live together
Mutualism- both species benefit
Commensalism- one benefits without harming the other
Parasitism- one lives on another while causing harm

12. mutualism

13. commensalism

14. Parasitism

15. Ecological Succession
Ecosystems are constantly changing in response to natural & human disturbances
2 types:
Primary
occurs on surfaces where no soil exists (volcanic activity)
Secondary
ecosystem restores to original condition after disturbance is over (fires, farming, etc.)

16. Primary succession

17. Secondary succession

18. The new island of Anak Krakatau
islands-and-evolution-the-new-island-of- anak-krakatau-video.htm assignment-discovery-succession-in- the-environment-video.htm

19. Any questions???