1. Symbiotic Relationships
Different organisms live together in a close association (symbiosis) which may include: nutritional, reproductive, and protective relationships.

2. Symbiotic relationships may or may not be beneficial to the organisms involved.

3. Types of symbiosis include:

4. Commensalism One organism is benefited and the other is not affected (+,0).

5. Gray Whale with Barnacles

6. Orchids on large tropical trees

7. Commensalism http://www.youtube.com/watch?v=e4xrdeagyYM

8. Remora fish and shark

9. Mutualism. In this relationship both organisms benefit from the association (+,+).

10. Mutualism http://www.youtube.com/watch?v=Af12sXa5-oo&feature=related

11. Nitrogen‑fixing bacteria within the nodules (roots) of legumes

12. Protozoa within Termites

13. A Flower and Bee

14. Parasitism The parasite benefits at the expense of the host (+,-).

15. Parasites http://www.youtube.com/watch?v=pw7TSYLRrmQ Elephantiasis
scrotum
worm
Bot fly

17. Athlete's foot fungus

18. Tapeworm, heartworm and fleas in dogs

21. Competition
occurs when different organisms living in the same environment (habitat) utilize the same limited resources – food, space, water, light, oxygen and minerals.

22. Buffalo, croc, lion awesome!

23. The more similar the requirements of the organisms involved, the more intense the competition.
This competition between different species is called interspecies competition.

24. A niche is the role that a species plays in its environment.

25. This usually establishes one species per niche in a community.
If two different species compete for the same food or reproductive sites, one species may be eliminated.
This usually establishes one species per niche in a community.

26. Ex) bluebird and starling compete for a reproductive site - the starling usually “wins,” causing the bluebird to be pushed out of that community.

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