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  • 1. 13.4 Food Chains And Food Webs KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem. Collect HW: 13.4 Pages # 408-411 5 Facts/Page
  • 2. 13.4 Food Chains And Food Webs Assessment 13.3 1. Few producers live deep below a lake’s surface, suggest an explanation for this pattern. 2. Could producers survive without consumers? Explain, why or why not. 3. What are the two processes used by producers to obtain energy?
  • 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. GRAMA GRASS DESERT COTTONTAIL HARRIS’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: herbivores that eat producers. – Secondary consumers: carnivores that eat herbivores. – Tertiary consumers: carnivores that eat secondary consumers. – Omnivores: eat both plants and animals, may be listed at different trophic levels in different food chains. – (how many trophic levels are below?) 4
  • 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.
  • 8. 13.4 Food Chains And Food Webs Energy Energy Systems • Energy is lost as it moves from one organisms to another. Typically 10% 10 pounds of rats = 1 pound of snake or coyote
  • 9. 13.4 Food Chains And412-416 5 Facts/PageHW: 13.5 Pages # Food Webs13.4 Study Guide Review1. Herbivore 2. Decomposer3. Detritivore 4. Omnivore5. Food Chain 6. Trophic Level7. Food Web8. The first consumer is called a ___9. How is the food web different from a food chain?10. What happens to energy at each link in a food web? Quiz next time!!!
  • 10. 13.4 Food Chains And412-416 5 Facts/PageHW: 13.5 Pages # Food WebsClassworkDefine:HerbivoresDecomposersDetritivoresOmnivoresStudy Guide 13.4 P. 139 #1-13Reader 13.4 P. 231 # 1-4 Quiz is next!!!