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Trophic Levels, Energy transfer and Pyramids

Trophic Levels, Energy transfer and Pyramids. Trophic Levels – is the position an organism occupies in a food chain. It refers to food or feeding. Food Chain. Food Chains. The energy flow from one trophic level to the other is know as a food chain Producers are at the first ENERGY LEVEL

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Trophic Levels, Energy transfer and Pyramids

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  1. Trophic Levels, Energy transfer and Pyramids

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

  3. Food Chain

  4. Food Chains • The energy flow from one trophic level to the other is know as a food chain • Producers are at the first ENERGY LEVEL • Primary Consumers are the SECOND ENERGY LEVEL • Secondary consumers are at the THIRD ENERGY LEVEL

  5. Trophic Levels (feeding levels) 3 2 1

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

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

  8. Food webs

  9. 1st producer 2nd Primary consumer

  10. Transfer of Energy • Energy lost from chain “link” to “link” is significant!

  11. from grass to sheep, loss is about 90%! HEAT 90% HEAT 90% 100% Energy Available 10% Original Energy! 1% Original Energy!

  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. Each level above only gets 10% of the energy from below • Ex: 10,000 J of producers (plants) only give 10% of energy to primary consumers • 1,000 J to primary consumers (snails, minnows, dragonflies) • 100 J to secondary consumers (small fish) • 10 J to tertiary consumers (big fish) • 1 J to quaternary consumers (fish hawk)

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

  15. Usually no more than 5 trophic levels since 6th level would have very little energy to keep it alive

  16. 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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