Ecosystem energy flow (part 2)
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Ecosystem energy flow (part 2)

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    Ecosystem energy flow (part 2) Ecosystem energy flow (part 2) Presentation Transcript

    • Biology I: Energy Flow Through an Ecosystem (part 2) Food Chains, Food Webs, Energy Pyramids
    • Agenda – Tues. Oct. 4, 2011
      • Warm-Up
      • Lesson
      • Wrap-Up (Identifying food chains)
      • Wrap-Up (Identifying producers, consumers, decomposers)
      • Homework Worksheet
    • Today’s Objectives
      • I will explore energy flow within an ecosystem.
      • I will define: ecosystem, herbivores, omnivores, carnivores, food chain, food web, energy pyramid.
      • I will trace food chains within a food web.
      • I will classify organisms as: producers, consumers, or decomposers.
    • Warm-Up
      • What do decomposers do?
      • If you ate chicken that previously ate grass, what type of consumer would you be?
      • Where does energy flow ultimately begin?
    • What is an Ecosystem?
      • An Ecosystem is all of the living organisms and non-living environment found in a particular place
    • What is an Ecosystem?
      • Example: a pond or aquatic ecosystem
        • Living Things: fish, turtles, algae, insects,
        • bacteria
        • Non-Living Things: physical and chemical properties of the pond like the amount of oxygen in the pond and its pH
    • Trophic Level
      • Each feeding level in an ecosystem
      • Each level of a food chain or food web
      • First Trophic Level: made up of only producers
    • Trophic Level
      • Second Trophic Level: made up of primary consumers
      • Herbivores: primary consumers that mainly eat plants
      • Examples: rabbits and grasshoppers
    • Trophic Level
      • Third Trophic Level: made up of secondary and tertiary consumers
      • Omnivores: consumers that eat both plants and animals
      • Examples: humans and squirrels
    • Trophic Level
      • Carnivores: consumers that mainly eat other animals
      • Examples: lions and sharks
    • Food Chain
      • The flow of energy from the sun to producers to primary consumers then to higher order consumers can be shown in a food chain .
    • Food Chain
      • Shows only one path for the flow of energy in an ecosystem.
    • Food Web
      • Ecosystems have many different types of food chains.
      • A food web shows how many different types of food chains are connected.
      • Food webs show the feeding relationships in an ecosystem.
    • Example Food Web
    • Energy Pyramid
      • Energy Pyramids show the energy loss between trophic levels in an ecosystem.
      • The flow of energy:
        • radiant energy (sunlight)
        • chemical energy (stored in plants)
        • kinetic energy and heat loss (created as consumers feed on each other)
    • Energy Pyramid
      • The amount of available energy decreases up the energy pyramid.
    • Energy Pyramid
      • Most of the “lost” energy is released as heat into the environment.
      • Each trophic level contains fewer organisms.
        • Why does this make sense?
    • How Many Chains are in this web? copyright cmassengale
    • Identify the Producers, Consumers, and Decomposers