ecosystemenergyflowpart2 111005093440-phpapp01 (2)
TRANSCRIPT
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Biology I: Energy Flow Through an
Ecosystem (part 2)
Food Chains, Food Webs, Energy Pyramids
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Agenda – Tues. Oct. 4, 2011
Warm-Up
Lesson
Wrap-Up (Identifying food chains)
Wrap-Up (Identifying producers, consumers, decomposers)
Homework Worksheet
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Today’s ObjectivesI 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.
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Warm-Up1.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?
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What is an Ecosystem?
An Ecosystem is all of the living organisms and non-living environment found in a particular place
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What is an Ecosystem?
Example: a pond or aquatic ecosystemLiving Things: fish, turtles, algae, insects, bacteriaNon-Living Things: physical and chemical
properties of the pond like the amount of oxygen in the pond and its pH
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Trophic LevelEach feeding level in an ecosystem
Each level of a food chain or food web
First Trophic Level: made up of only producers
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Trophic LevelSecond Trophic Level:
made up of primary consumers
Herbivores: primary consumers that mainly eat plants
Examples: rabbits and grasshoppers
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Trophic LevelThird Trophic Level:
made up of secondary and tertiary consumers
Omnivores: consumers that eat both plants and animals
Examples: humans and squirrels
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Trophic Level
Carnivores: consumers that mainly eat other animals
Examples: lions and sharks
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Food ChainThe flow of energy from the sun to
producers to primary consumers then to higher order consumers can be shown in a food chain.
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Food ChainShows only one path for the flow of
energy in an ecosystem.
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Food WebEcosystems 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.
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Example Food Web
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Energy PyramidEnergy 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)
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Energy PyramidThe amount of available energy
decreases up the energy pyramid.
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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?
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18
How Many Chains are in this web?
copyright cmassengale
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Identify the Producers, Consumers, and Decomposers