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I. Energy Flow

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I. Energy Flow A. Producers Make their own food through photosynthesis Examples: Plants, algae B. Consumers Feed on other organisms, cannot make their own food ... – PowerPoint PPT presentation

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Title: I. Energy Flow


1
I. Energy Flow
  • A. Producers
  • Make their own food through photosynthesis
  • Examples Plants, algae

2
  • B. Consumers
  • Feed on other organisms, cannot make their own
    food
  • Example humans, bear, insects

3
  • C. Decomposers
  • Break down dead organisms, recycle chemicals to
    soil, water, air
  • Example fungi bacteria

4
  • D. Energy enters ecosystems as LIGHT is
    converted to CHEMICAL ENERGY by producers and
    exits the ecosystem as HEAT.

5
II. Food Chain
  • A. Trophic levels
  • Feeding level
  • Represents position in food
  • chain/food web

6
  • B. Food Chain
  • pathway of food transfer from one
  • trophic level to another
  • You always start with PRODUCERS on the
    left/bottom of a food chain.

7
  • C. Producer --gt Primary Consumer--gt
  • Secondary Consumer--gt Tertiary Consumer
  • D. Decomposers are found at EACH trophic level.

8
III. Food Web
  • A. Definition
  • interconnected branching food chains- more
    realistic representation of feeding relationships

9
IV. Three Kinds of Ecological Pyramids
  • A. Energy pyramid
  • Description diagram representing energy loss
    from one trophic level to the next

10
10 Rule An average of 10 of the
available energy at a trophic level is converted
to biomass in the next higher trophic level.
11
  • B. Biomass Pyramid
  • Description represents the dry mass of organisms
    at each trophic level

12
  • C. Pyramid of Numbers
  • Description the number of individual organisms
    in each trophic level of an ecosystem

13
  • Why do you think all 3 pyramids look similar?
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