Food Webs - PowerPoint PPT Presentation

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Food Webs

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  1. Food Webs • Food chain: Linear series of feeding relationships. • Food web: Shows the overlapping and interconnected food chains present in a community

  2. Food Webs

  3. Food Web Question • Using the food web on page 147, what would lead to an increase in the amount of largemouth basses?

  4. Food Web Question • Using the food web on page 147, what would lead to an increase in the amount of largemouth basses? • An increase in number of killfish • An increase in number of Flagfish • An increase in number of grass shrimp and worms • An increase in number of Everglades cray fish • A decrease in alligators • A decrease in anhingas

  5. Food Web Sample Question • Using the food web on page 147, list all the predators in the food web.

  6. Keystone Species • Species that have strong and/or wide-reaching effects on a community • Removal of a keystone species can significantly alter the structure of a community.

  7. Keystone Species • http://www.youtube.com/watch?v=_IWw8Ruz8Uo

  8. Producers, Consumers and the Energy Pyramid • http://www.brainpop.com/science/diversityoflife/energypyramid/ TAKE NOTES in your notebook!!!

  9. Producers (autotrophs) • Organisms that create their own food. • Photosynthesisis the process by which producers use energy from sunlight to convert waterand carbon dioxideinto sugar, releasing oxygen as a byproduct. • Chemosynthesisis the process by which producers use hydrogen sulfideto convert CO2 and H2O to create sugar.

  10. Photosynthesis

  11. Producers examples

  12. Consumers (heterotrophs) • Organisms that eat other organisms. • Consumers undergo cellular respiration, which is the process by which consumed sugars arebroken down and releases CO2 and H2O as byproducts.

  13. Herbivores = plant eaters