1. Energy Flow in an Ecosystem
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Energy Flow
Energy in an ecosystem originally comes from the sun
Energy flows through Ecosystems from producers to consumers
Producers (make food)
Consumers (use food by eating producers or other consumers)
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Producers
any organism that can produce its own food supply!
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Autotrophs
Captures energy and transforms it into organic, stored energy for the use of living organisms.
Autotrophs are also called Producers
Example: Plants, algae, & some bacteria are examples
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Photoautotroph
Producer That Captures Energy from the sun by:
Photosynthesis
Adds Oxygen to the atmosphere
Removes Carbon Dioxide from the Atmosphere
Algae
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6. Habitat of Photoautotrophs
On Land
Plants
In The Sea
Algae
Tidal Flats & Salt Marshes
Cyanobacteria
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Consumers
Cannot get their energy from the sun
Get their energy from eating other organisms
Also called ‘heterotrophs’
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Consumers
5 types:
Herbivores
Eat Only Plants
Carnivores
Eat Only Other anuma Animals
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Consumers
Omnivores (Humans)
Eat Plants & Animals
Detritivores (Scavengers)
Feed On Dead Plant & Animal Remains (buzzards)
Decomposers
Fungi & Bacteria
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10. Feeding Relationships
Energy flows through an ecosystem in one direction
from producers to various levels of consumers
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11. Feeding Relationships
Food Chain
Simple Energy path through an ecosystem
Food Web
More realistic path through an ecosystem made of many food chains
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Food Chain
3rd Order consumer
2nd Order Consumer
1st order Consumer
4th Order Consumer
Producer (trapped sunlight & stored food)
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13. Name the Producer, Consumers & Decomposers in this food chain:
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Food Web
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17. Each Level In A Food Chain or Food Web is a Trophic Level.
Trophic Levels
Each Level In A Food Chain or Food Web is a Trophic Level.
Producers
Always The First Trophic Level
How Energy Enters The System
Herbivores
Second Trophic Level
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18. Each level depends on the one below it for energy.
Trophic Levels
Carnivores/Omnivores
Make Up The Remaining Trophic Levels
Primary 1, secondary 2 , tertiary 3 , quaternary 4 
Each level depends on the one below it for energy.

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Ecological Pyramids
Graphic Representations Of The Relative Amounts of Energy or Matter At Each Trophic Level
May be:
Energy Pyramid
Biomass Pyramid
Pyramid of Numbers
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Energy Pyramid
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Biomass Pyramid
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Pyramid of Numbers
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