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Community Interactions. Chapter 5 Section 2: Interactions in Communities Pages 109-111. Introduction.

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community interactions

Community Interactions

Chapter 5

Section 2: Interactions in Communities

Pages 109-111


Interactions in communities can take many forms. Predators and prey are locked in a struggle for survival. Organisms with the same needs compete for food. Parasites and hosts try to get ahead of one another. Some organisms even depend on one another for survival. (Holt, page 109)

living relationships
Living Relationships
  • Predation—one organism (predator) captures and feeds on another organism (prey)
    • Predators come is all sizes!
living relationships1
Living Relationships
  • Herbivory—herbivores that eat plants without killing the plant
    • Plants use various defenses against herbivory
    • What are they?
living relationships2
Living Relationships
  • Competition—when organisms attempt to use the same resource in the same place at the same time
  • Symbiosis—relationships between different species living closely together
    • Sym- “together”, -biosis “living”
  • Three types:
    • Mutualism
    • Commensalism
    • Parasitism
  • Mutualism—both species benefit
  • Examples: bacteria in digestive tract, fish and shrimp that clean bigger fish and turtles
  • Commensalism—one member benefits, the other is not helped nor harmed
    • Examples:Bromeliads live in the tops of the trees in rain forest without harming trees

Spanish Moss is an epiphyte (type of plant that grows on other plants for support, moisture, and sunlight)

  • Parasitism- one organism (parasite) lives off the other organism (host) while harming it but not killing the host!
    • Parasites can live on or in the host
    • Examples:ticks, fleas, mosquitoes, heartworm, leeches