COMMUNITY ECOLOGY I

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COMMUNITY ECOLOGY I

• pp. 399-403

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• Species (organism)
• Population
• Community (interaction of different populations)
• Ecosystem
• Biosphere

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SYMBIOSIS

• Close interactions between two (populations) of
  organisms

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Mutualism
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Competition

• Niches overlap and resources are limited
• a) Interspecific competition two
  different
• species use same food source
• b) Intraspecific competition competition
  
• within the same species (population)
• - very intense because they have
  identical
• requirements

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• Niches overlap and resources are limited
• Fundamental niche set of resources a population
  is capable of using under ideal conditions
• Realized niche resources a population actually
  uses due to interspecific interactions

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• c) Competitive exclusion one species presence
  causes other species to die, move, or switch to a
  new food source

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d) Character displacement divergence of
characteristics (i.e. beaks in finches)

• e) Resource (niche) partitioning using specific
  parts of the same resource (i.e. trees)