1. 14.2 Community Interactions OBJECTIVES Students will learn that competition and predation are two important ways that organisms interact AND that symbiosis is a close relationship between species.

2. 14.2 Community Interactions KEY CONCEPT Organisms interact as individuals and as populations.

3. 14.2 Community Interactions Competition occurs when two organisms fight for the same limited resource. Intraspecific competition: 2 of the same species compete for a resource Ex: 2 tigers fighting for a kill or a mate

4. 14.2 Community Interactions Interspecific competition: 2 different species fighting over the same resources Ex: A lion and a hyena fighting over a kill

5. 14.2 Community Interactions Predation occurs when one organism captures and eats another.

6. 14.2 Community Interactions There are three major types of symbiotic relationships. 1) Mutualism: both organisms benefit Egyptian Plover and crocodile Bat and Saguaro cactus

7. 14.2 Community Interactions 2) Commensalism: one organism benefits, the other is unharmed Ex: Cattle Egret- The cattle disturb insects as they graze, making it easy for Egrets to find their meals

8. 14.2 Community Interactions 3) Parasitism: one organism benefits, the other is harmed –ectoparasites (such as leeches) live on the outside of the body –endoparasites (such as hookworms) live inside the body