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Entry 18: Food Chains and Food Webs Food Chain: series of events showing who eats who in an ecosystem. Always starts with the sun (It’s the origin of all energy in an ecosystem.) Sun Shoots Vole Weasel Owl Sun Roots Beetle Larva Salamander Shrew Owl Producer 1st level Consumer 2nd Level Consumer 3rd Level Consumer 4th Level Consumer Autotroph Heterotroph Heterotroph Heterotroph Heterotroph Herbivore Carnivore Carnivore Carnivore Food Web is a series of overlapping food chains in an ecosystem. Sample Food Web (not related to the above food chains…) Energy Pyramid: diagram showing energy loss (use) in a food chain. A food chain can be re-drawn in the form of an energy pyramid. Owl, 2 kcal Shrew, 20 kcal Salamander, 200 kcal Beetle Larva, 2,000 kcal Roots ex: 20,000 kcal *As you move up the levels of the energy pyramid, the number of organisms in each population DECREASES. *As you move up the levels of the energy pyramid, the amount of energy left over to pass to the next level consumer DECREASES. 90% gets used by the organisms at each level for daily living activities. The left over 10% gets passed to the next consumer when an organism is eaten. Energy is measured in calories or kilocalories.