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Go with The Flow! Food Chains, Webs, and Pyramids The biologist’s way of tracking the flow of energy in an ecosystem Most basic: only one group of organisms Arrows show direction of energy flow Helps biologists study individual species Contains: ◦ Abiotic factors = sun (source of all energy) ◦ Producer = plants (brings energy into ecosystem) ◦ Consumers = things with mouths Primary consumer – herbivore / omnivore Secondary consumer – carnivore / omnivore Tertiary (third) consumer - carnivore Abiotic energy source producer primary consumer Food Chains Who’s eating who? secondary consumer tertiary consumer Combines related food chains from the same ecosystem More realistic representation of nature Arrows still show direction of energy flow Helps biologists study the ecosystem and species interaction Food Webs Choices, choices, choices Shows the loss of energy as it passes through the different organisms. Only 10% of energy passes on to the next level Helps biologists study the health of an ecosystem Top = final consumer, dominant predator least energy Fewest number of individuals 10% always producers most energy Greatest number of individuals 10% Bottom = 10% Energy Pyramids The big picture