chapter 23.1. energy roles an organism’s energy role in an ecosystem may be that of a producer,...
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Chapter 23.1
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Energy Roles• An organism’s energy role in an
ecosystem may be that of a producer, consumer, or decomposer.
• An organism’s energy role is determined by how it obtains energy and how it interacts with the other living things in its ecosystem.
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• Organisms that carry out photosynthesis are called autotrophs. Another word for an organism that can make its own food is a producer. Producers are the source of all the food in an ecosystem.
Energy Roles
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• Heterotrophs cannot make their own food. These organisms depend on the producers for food and energy. Another word for an organism that obtains energy by feeding on other organisms is a consumer.
Energy Roles
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• Organisms that break down wastes and dead organisms and return the raw materials to the environment are called decomposers.
• Two major groups of decomposers are bacteria and fungi, such as molds and mushrooms.
Energy Roles
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Food Chains and Food Webs
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• A food chain is a series of events in which one organism eats another and obtains energy.
Food Chains and Food Webs
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• A food chain is a series of events in which one organism eats another and obtains energy.
Food Chains and Food Webs
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Trophic Levels
Nourishment or eating
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Producers Second Level (or Secondary) Consumers
decomposers
First Level (or Primary) Consumers
Trophic Levels
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Producers Consumers
decomposers
Consumers
Trophic Levels
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A food web consists of the many overlapping food chains in an ecosystem.
Food Webs
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An energy pyramid shows the amount of energy that moves from one feeding level to another in a food web.
Food Chains and Food Webs
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• Energy is used at each level to carry out life processes.
• The most energy is available at the producer level.
• Less energy is available to the upper levels because it’s been used up.
Food Webs