Food Chains, Food Webs and Energy Pyramids 7-4.2.

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Presentation transcript:

Food Chains, Food Webs and Energy Pyramids 7-4.2

Food Chains Use pictures or words and arrows to show the movement of energy through the trophic levels of organisms. The trophic level of an organism indicates the position that the organism occupies in the food chain—what it eats and what eats it. The levels are numbered according to how far the particular organism is along the chain from the primary producer at Level 1, to herbivores (Level 2), to predators (Level 3), to carnivores or top carnivores (Levels 4 or 5).

Food Webs Describe the organisms found in interconnecting food chains using pictures or words and arrows. Food webs describe the complex patterns of energy flow in an ecosystem by modeling who consumes whom or what.

Food Web

Energy Pyramids Show the amount of energy that moves from one trophic level to another in a food chain. The most energy is available at the producer level of the pyramid. Energy availability decreases as it moves up the energy pyramid.

Energy Pyramid