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.
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14.2 Community Interactions
KEY CONCEPT Organisms interact as individuals and as populations.
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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
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14.2 Community Interactions
Interspecific competition: 2 different species fighting over the same resources
Ex: A lion and a hyena fighting over a kill
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14.2 Community Interactions
• Predation occurs when one organism captures and eats another.
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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
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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
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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