1. 13.4 Food Chains And Food Webs KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.

2. 13.4 Food Chains And Food Webs MI State Standards L2.p4A Classify different organisms based on how they obtain energy for growth and development. L3.p2A Describe common relationships among organisms and provide examples of producer/consumer, predator/prey, or parasite/host relationships. L3.p2C Describe the role of decomposers in the transfer of energy in an ecosystem. L3.p3D Predict how changes in one population might affect other populations based upon their relationships in a food web. B3.2C Draw the flow of energy through an ecosystem. Predict changes in the food web when one or more organisms are removed. B3.3A Use a food web to identify and distinguish producers, consumers, and decomposers and explain the transfer of energy through trophic levels.

3. 13.4 Food Chains And Food Webs A food chain is a model that shows a sequence of feeding relationships. A food chain links species by their feeding relationships. A food chain follows the connection between one producer and a single chain of consumers within an ecosystem. DESERT COTTONTAILGRAMA GRASSHARRIS’S HAWK

4. 13.4 Food Chains And Food Webs Consumers are not all alike. –Herbivores eat only plants. –Carnivores eat only animals. –Omnivores eat both plants and animals. –Detritivores eat dead organic matter. –Decomposers are detritivores that break down organic matter into simpler compounds. carnivore decomposer

5. 13.4 Food Chains And Food Webs Specialists are consumers that primarily eat one specific organism or a very small number of organisms. Generalists are consumers that have a varying diet.

6. 13.4 Food Chains And Food Webs Trophic levels are the nourishment levels in a food chain. –Primary consumers are herbivores that eat producers. –Secondary consumers are carnivores that eat herbivores. –Tertiary consumers are carnivores that eat secondary consumers. –Omnivores, such as humans that eat both plants and animals, may be listed at different trophic levels in different food chains.

7. 13.4 Food Chains And Food Webs A food web shows a complex network of feeding relationships. An organism may have multiple feeding relationships in an ecosystem. A food web emphasizes complicated feeding relationships and energy flow in an ecosystem.