Food Webs and Food Chains - PowerPoint PPT Presentation

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Food Webs and Food Chains

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  1. Food Webs and Food Chains Day 2

  2. Food Chains and Food Webs • Food Chains a. Model showing movement of energy through the ecosystem b. Uses arrows to show “transfer of energy” Biological magnification-increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web

  3. Quaternary consumer Tertiary consumer Label the levels on your notes Secondary consumer Primary consumer Primary producer

  4. Why do both food chains start with the sun? 10% rule- only about 10% is received by eating, the rest is used for daily like functions and also given off as heat

  5. Food Web • a. More complicated than a food chain • b. Shows more than one food source for each organism • c.More realistic view of energy transfer

  6. 1. What would happen if the phytoplankton all died off? 2. What would happen if the Baleen, smaller toothed, and sperm whales all died off?

  7. Tropic Levels • Each step in the food chain or food web is called a tropic level. 2. Ecological pyramid A. Shows the relative energy movement through the environment.

  8. Draw this pyramid

  9. Ticket out the doorget out half a sheet of paper

  10. Draw a food web, not one from your notesInclude what happens to the amount of energy that gets transferred.