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Chapter 6 PowerPoint Presentation

Chapter 6

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Chapter 6

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  1. Chapter 6 Ecosystems and Ecosystem Management Botkin and Keller Environmental Science 5e

  2. Basic Characteristics of Ecosystems • Sustained life on Earth is a characteristic of ecosystems, not of individual organisms or populations • Structure: • Living (Ecological Communities) • Non-living • Processes • Cycling of chemical elements • Flow of energy • Change (Succession) Botkin and Keller Environmental Science 5e

  3. Ecological Communities and Food Chains • Ecological Communities are defined in 2 ways: • 1. A set of interacting species that occur in the same place • Food chains, food webs, trophic levels (autotrophs) • A set of species found in one area Botkin and Keller Environmental Science 5e

  4. Food Chains and Food Webs • A Terrestrial Food Chain • 4 trophic levels: • Autotrophs • Herbivores • Carnivores • Decomposers • People are omnivores • An Oceanic Food Chain • The Food Web of the Harp Seal Botkin and Keller Environmental Science 5e

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  6. Botkin and Keller Environmental Science 5e

  7. The Community Effect • Species interact directly and indirectly • Community-level interactions • Keystone species • Have large effects on it’s community or ecosystem • Its removal changes the basic nature of the community • Holistic View Botkin and Keller Environmental Science 5e

  8. Botkin and Keller Environmental Science 5e

  9. Botkin and Keller Environmental Science 5e

  10. Botkin and Keller Environmental Science 5e