Food Chains and Food Webs - PowerPoint PPT Presentation

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Food Chains and Food Webs

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  1. Food Chains and Food Webs Honors Biology

  2. Ecosystem • All of the living (biotic) and nonliving (abiotic) things (factors) in a large community.

  3. Abiotic vs. Biotic • Which is abiotic and which is biotic? • A rock • A mouse • A tree • A waterfall

  4. Organisms • Plants – called producers and autotrophs • Animals – called consumers and heterotrophs • Auto means “self”. Hetero means “different” or “other”.

  5. Different types of consumers • Herbivore – eats producers only • Omnivore – eats both producers and other consumers • Carnivore – eats consumers only • Detritivore – breaks down all organisms

  6. Food Chains/Webs • Illustrates the flow of energy in an ecosystem and how organisms interact with each other. • Also shows feeding relationships.

  7. Food chains • One direction only. • Arrows show direction of energy flow. • Producers always listed first. • Consumers are primary, secondary, tertiary, quaternary

  8. Food Webs • Energy flows in more than one direction. Producers toward the bottom, primary consumers next, secondary consumers near top. • Made up of more than one food chain.

  9. Food Webs How many food chains do you see?

  10. Energy • Is lost as you move from one level (trophic level) to another. 90% is lost while 10% is available for next level = 10% rule. • How is the energy lost?

  11. Disturbances • How do disturbances in one part of a food web affect the rest of the web or ecosystem?