1. Chapter 17 Section 1 How Organisms Interact in Communities

2. Evolution No organism in the environment is more important than another. Coevolution  organisms evolve together Symbiosis is 2 or more species in a relationship

3. Symbiosis 5 types: 1. Predation 2. Parasitism 3. Mutualism 4. Commensalism 5. Competition

4. Predation (+,-)

5. Predation One species hunts and kills another for food PredatorsPrey LionZebra WhaleFish HumanCow

6. Predators Evolution favors faster, stronger, quieter… individuals

7. Prey Evolution favors… Mimicry Secondary Compounds Defensive chemicals, smells, tastes

8. Parasitism (+,-)

9. Parasitism One species feeds on another Can live on or in another species Examples Ticks, lice, leeches, tapeworms, hookworms

10. Parasites Eater Do not want to kill their host

11. Host Eaten

12. Mutualism (+,+)

13. Mutualism Both species benefit from the relationship Examples Bees and flowers Sucker fish and Sea turtles

14. Commensalism (+,0)

15. Commensalism One species benefits and the other is neither helped nor harmed. Examples Clownfish and Sea anemone Epiphytes—plants growing on tree branches

16. Competition (+,-)

17. When 2 species use the same limited resource Resources can include: Nesting space, water, food, living space, light, minerals… Most of these interactions do not involve fighting or anything physical Competition