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Trophic Levels, Energy transfer and Pyramids

Trophic Levels, Energy transfer and Pyramids. Producers Sunlight is the main energy source for life on earth Also called autotrophs Use light or chemical energy to make food 1. Plants 2. plant-like protists (algae) 3. Bacteria. Consumers

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Trophic Levels, Energy transfer and Pyramids

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  1. Trophic Levels, Energy transfer and Pyramids

  2. Producers • Sunlight is the main energy source for life on earth • Also called autotrophs • Use light or chemical • energy to make food • 1. Plants • 2. plant-like protists (algae) • 3. Bacteria

  3. Consumers • Organisms that rely on other organisms for their energy and food supply • Also called heterotrophs

  4. Trophic Levels – is the position an organism occupies in a food chain. It refers to food or feeding.

  5. Trophic Levels (feeding levels) 3 2 1

  6. Food Chain

  7. Food Web • Food webs are multiple food chains.

  8. Food Webs Food webs show ALTERNATIVE PATHWAYS other possible pathways through which an organism can obtain energy

  9. Food webs

  10. 1st producer 2nd Primary consumer

  11. Transfer of Energy • Energy lost from chain “link” to “link” is significant! • Each level above only gets 10% of the energy from below

  12. Energy lost from one trophic level (energy level) to the next level can be represented by a pyramid 4⁰CONSUMERS 3 CONSUMERS 2 CONSUMERS 1 CONSUMERS PRODUCERS

  13. ENERGY PYRAMID 1 J 10 J 100 J 1,000 J 10,000 J

  14. Ecological Pyramid • Which level has the most energy? • Which level has the most organisms? • Which level has the least organisms? • Which level has the least energy?

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