1. FOOD WEBS

2. FOOD CHAINS Food Chain-
A sequence of organisms that eat one another in an ecosystem.

3. FOOD WEBS
Food Web- A diagram that shows all the feeding relationships in an ecosystem.

4. WHO’S INVOLVED Food Webs have 3 groups of organisms that are involved.
Producers
Consumers
Decomposers

5. PRODUCERS
Producer- An organism that is able to make its own food through photosynthesis.
Food webs always start out with the producers in an ecosystem.

6. CONSUMERS Consumer- An organism that eats other organisms
Primary Consumer- Eats producers
Secondary Consumers- Eat primary consumers
Tertiary Consumers- Eat secondary consumers

7. PRIMARY CONSUMERS

8. SECONDARY COMSUMERS

9. TERTIARY COMSUMERS

10. CONSUMERS
Primary, Secondary, and Tertiary consumers often have more than one type of feeding relationship that may make them hard to fit into just one group.
Example: Trout
Secondary
Consumer
Trout
Mayfly
Primary
Consumer
Producer
Planktonic
Algae

11. DECOMPOSERS
Decomposer- An organism that consumes part of dead organisms and decaying matter.

12. Food webs like the one below can sometimes be confusing.

13. Tertiary Consumers
Human
Snake
Eagle
Secondary Consumers
Salamander
Frog
Trout
Decomposers
Primary Consumers
Dragonfly
Mayfly
Producers
Phytoplankton

15. ENERGY ARROWS
Arrows on a food web are always drawn FROM food source TO food consumer.

16. TYPES OF CONSUMERS Herbivore- Organism that eats ONLY PLANTS
Will always be a primary consumer.
Carnivore- Organism that eats ONLY MEAT
Carnivores that eat Herbivores are secondary consumers
Carnivores that eat other Carnivores are tertiary consumers
Omnivore- Organisms that eat BOTH plants and meat.