3.3_worksheet_key.pdf - Name KEY Class Date 3.3 Energy Flow...

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Name KEY Class Date 3.3 Energy Flow in Ecosystems Lesson Objectives Trace the flow of energy through living systems. Identify the three types of ecological pyramids. Lesson Summary Food Chains and Food Webs Energy flows through an ecosystem in one direction from primary producers to various consumers. A food chain is a series of steps in which organisms transfer energy by eating and being eaten. Producers, such as floating algae called phytoplankton, are at the base of every food chain. A food web is a network of all the food chains in an ecosystem. Food webs are very complex. Small disturbances to one population can affect all populations in a food web. Changes in populations of zooplankton, small marine animals that feed on algae, can affect all of the animals in the marine food web. Trophic Levels and Ecological Pyramids Each step in a food chain or food web is called a trophic level . Producers make up the first trophic level. Consumers make up higher trophic levels. Each consumer depends on the trophic level below it for energy. An ecological pyramid is a diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain or food web. Types of ecological pyramids
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