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Community Interactions

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Presentation on theme: "Community Interactions"— Presentation transcript:

1 Community Interactions
Ecology Notes 4-2 Community Interactions

2 Biotic vs. Abiotic Biotic factors – living factors in an environment. Ex. Trees, birds, bacteria, etc. Abiotic factors – non living factors in an environment. Ex. Temp., rainfall, humidity, soil.

3 Niche Niche – full range of conditions in which an organism lives (biotic and abiotic). It is like your “occupation”.

4 Competition Competition – occurs when organisms attempt to use a resource (water, nutrients, light, food or space) at the same time. We call this a +/- relationship. Competitive Exclusion Principle – no two organisms can occupy exactly the same niche in the same habitat at the same time.

5 Predation One organism captures and feeds on another organism.
This is a +/- relationship.

6 Symbiosis – any relationship where two organisms live closely together.
3 types of Symbiosis 1. Mutualism +/+ both organisms benefit. Ex. Flowers/insects.

7 2. Commensalism +/0 one organism benefits and the other is neither helped nor harmed. Ex. Whales/barnacles

8 3. Parasitism +/- One organism lives on or in another organism. Ex
3. Parasitism +/- One organism lives on or in another organism. Ex. Dog/flea


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