2Energy RolesAn organism’s energy role in an ecosystem may be that of a producer, consumer, or decomposer.
3Producers An organism that can make its own food is a producer. AutotrophSource of all food in an ecosystem.Capture energy from sunlight and stores it as food energy.
4ConsumersConsumers are heterotrophs, or living things that cannot make food for themselves.A food chain contains several kinds of consumers, each of which occupies a different trophic level.Herbivore, carnivores, omnivores
5Consumer Tropic Levels Primary consumers eat producers (herbivores)Secondary consumers eat primary consumers (carnivores)Tertiary consumers eat secondary consumers (carnivores)Scavengers are carnivores that feed on the bodies of dead organisms.
6DecomposersHelp break down wastes and dead organisms and return the raw materials to the environmentBacteria and fungi
7Food ChainsSeries of events where one organism eats another and obtains energy.First organism in chain is the producer.The second organism is the consumer that eats the producer.
8Plankton—Crab—Seal—Orca This is only one possible chain in a marine ecosystem.
9Come up with an example to fill in the blocks of a food chain in two different ecosytems.
10Food Webs Consists of many overlapping food chains in an ecosystem. Some organisms may play more than one role by changing consumer levels.
11What happens in a food web if one or more of the organisms disappear?