Ecosystemenergyflowpart2 111005093440-phpapp01 (1)
- 1. Biology I: Energy Flow Through an Ecosystem (part 2) Food Chains, Food Webs, Energy Pyramids
- 2. Agenda – Tues. Oct. 4, 2011 Warm-Up Lesson Wrap-Up (Identifying food chains) Wrap-Up (Identifying producers, consumers, decomposers) Homework Worksheet
- 3. Today’s Objectives I will explore energy flow within an ecosystem. I will define: ecosystem, herbivores, omnivores, carnivores, food chain, food web, energy pyramid. I will trace food chains within a food web. I will classify organisms as: producers, consumers, or decomposers.
- 4. Warm-Up 1. What do decomposers do? 2. If you ate chicken that previously ate grass, what type of consumer would you be? 3. Where does energy flow ultimately begin?
- 5. What is an Ecosystem? An Ecosystem is all of the living organisms and non-living environment found in a particular place
- 6. What is an Ecosystem? Example: a pond or aquatic ecosystem Living Things: fish, turtles, algae, insects, bacteria Non-Living Things: physical and chemical properties of the pond like the amount of oxygen in the pond and its pH
- 7. Trophic Level Each feeding level in an ecosystem Each level of a food chain or food web First Trophic Level: made up of only producers
- 8. Trophic Level Second Trophic Level: made up of primary consumers Herbivores: primary consumers that mainly eat plants Examples: rabbits and grasshoppers
- 9. Trophic Level Third Trophic Level: made up of secondary and tertiary consumers Omnivores: consumers that eat both plants and animals Examples: humans and squirrels
- 10. Trophic Level Carnivores: consumers that mainly eat other animals Examples: lions and sharks
- 11. Food Chain The flow of energy from the sun to producers to primary consumers then to higher order consumers can be shown in a food chain.
- 12. Food Chain Shows only one path for the flow of energy in an ecosystem.
- 13. Food Web Ecosystems have many different types of food chains. A food web shows how many different types of food chains are connected. Food webs show the feeding relationships in an ecosystem.
- 14. Example Food Web
- 15. Energy Pyramid Energy Pyramids show the energy loss between trophic levels in an ecosystem. The flow of energy: radiant energy (sunlight) chemical energy (stored in plants) kinetic energy and heat loss (created as consumers feed on each other)
- 16. Energy Pyramid The amount of available energy decreases up the energy pyramid.
- 17. Energy Pyramid Most of the “lost” energy is released as heat into the environment. Each trophic level contains fewer organisms. Why does this make sense?
- 18. 18 How Many Chains are in this web? copyright cmassengale
- 19. Identify the Producers, Consumers, and Decomposers