Ecology Notes 4-2

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Ecology Notes 4-2

• Community Interactions

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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.

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Niche

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

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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.

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Predation

• One organism captures and feeds on another
  organism.
• This is a /- relationship.

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

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

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