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Chapter 4 Section 2 Niches and Community interactions

Chapter 4 Section 2 Niches and Community interactions. Key Questions. What is a niche? How does competition shape communities? How do predation and herbivory shape communities? What are the three primary ways that organisms depend on each other?. Niche. Conditions in which something lives

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Chapter 4 Section 2 Niches and Community interactions

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  1. Chapter 4 Section 2Niches and Community interactions

  2. Key Questions What is a niche? How does competition shape communities? How do predation and herbivory shape communities? What are the three primary ways that organisms depend on each other?

  3. Niche Conditions in which something lives Tolerance Outside tolerance level = stress Habitat, “Occupation” All resources, biotic and abiotic factors

  4. Competition +, - Niche overlap Competitive Exclusion Principle ex. Paramecium Intraspecies vs. Interspecies

  5. Competition Effects on Community Determines #’s and kinds of species Resource Partitioning Warblers

  6. Eating Things Predator-Prey Relationship Population Size/Distribution Regulation Herbivore-Plant Relationship Population Size/Distribution Regulation

  7. Keystone Species Dramatic changes to community Examples: Kelp Sea Urchins  Sea Otters Grasses  Elk  Yellowstone Wolves

  8. Symbiosis • Parasitism • Mutualism • Commensalism

  9. Mutualism +, + Cooperative Relationship

  10. Parasitism +, - Parasite feeds on host Endoparasites v. Ectoparasites Natural Selection

  11. Commensalism +, 0 Beneficial for 1 organism Epiphytes

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