1. 18.3 Types of Interactions

2. Limiting Factors & Carrying Capacity  Limiting Factor – something that limits the size of a population  Ex: Food, Water, Space  Carrying Capacity – the largest population that an environment can support.  Limiting factors influence the carrying capacity.

3. Competition  Competition occurs when two organisms try to use the same resources.  Can be within a population or a community

4. Predation  Prey – organism that is killed & eaten by another  Predator – organism that kills another for food.  Predators have adaptations that help them capture their prey (i.e. speed, sharp teeth, claws).  Prey also have adaptations to protect themselves (i.e. camouflage, poison).

5. Symbiosis  Symbiosis is the long term association or relationship between organisms that benefits at least 1 organism.  3 Types: Mutualism, Commensalism, Parasitism

6. Mutualism  Symbiotic relationship in which both organisms benefit.  Example:  Egyptian Plover & the crocodile

7. Commensalism  Symbiotic relationship in which one organism benefits and the other is unaffected.   Example:  Whale Shark & Golden Trevallys

8. Parasitism  Symbiotic relationship in which one organism benefits and the other is harmed.   Example:  Ant & Parasitic Fungus

9. Video Time

10. Comprehension Check  How do limiting factors affect the carrying capacity?  How are the three types of symbiosis different?  How are predation and parasitism different?