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Food Webs and Energy Pyramids Trophic Levels The trophic level of an organism is the position it holds on the food chain or web. Food Web Energy moves from one organism to the next in a one-way direction. •Overlapping food chains. •More accurate in showing energy connections in an ecosystem. Food Web Pg.486 Identify: •Producers •Primary consumers •Secondary consumers •Tertiary consumers Energy Pyramid The pyramid represents energy. More energy is available at the base of the pyramid than at its top. Energy is lost each time one organism eats another. Energy Pyramid Organisms use 90% of energy they bring in for survival and store 10% of energy in their tissues When a consumer eats an organism it gets the left over 10% of stored energy. Yellowstone Wolves Without wolves in the ecosystem the Elk became overpopulated. There was not enough grass for all species. Wolves kill old, injured and diseased elk. The reintroduction of the wolf returned balance to the Yellowstone ecosystem.