14.2 community interactions objectives students will learn that competition and predation are two...
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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.
14.2 Community Interactions
KEY CONCEPT Organisms interact as individuals and as populations.
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
14.2 Community Interactions
Interspecific competition: 2 different species fighting over the same resources
Ex: A lion and a hyena fighting over a kill
14.2 Community Interactions
• Predation occurs when one organism captures and eats another.
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
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
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
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