SPECIES INTERACTIONS

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SPECIES INTERACTIONS

• pp. 399-403

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

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SYMBIOSIS

• Close interactions between two (populations) of
  organisms

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COMPETITION

• niches overlap due to limited resource
• 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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• c) competitive exclusion one species gets food
  better and the other species dies out, moves, or
  switches to a new food source

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

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

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PARASITISM

• Parasitism /- (but not killed)
• EX. intestinal worms / humans
• 1. parasite small and lives on or in the
  host
• organism
• 2. weaken the host
• 3. evolutionary adaptation kept the host
• healthy enough to allow parasite
• reproduction

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MUTUALISM AND COMMENSALISM

• Mutualism ( /) both benefit
• EX. flowers/insect
• Commenalism (/0) one benefits and one neutral
  
• EX. Birds / trees