3. ALL LIVING THINGS
NEED ENERGY
In an ecosystem, an organisms’
role depends on:
 How it obtains energy &
How it interacts with the other
living things in the ecosystem
Organism’s energy role is:
Producer
Consumer
Decomposer

4. PRODUCERS CONSUMERS DECOMPOSERS

5. Introducing
PRODUCERS
It all begins with plants that
make their own food…..

7. CONSUMERS CAN BE…
•Herbivores
 eat plants
•Carnivores
eat animals
•Omnivores
Eat plants and animals

9. DECOMPOSERS ARE
NATURE’S RECYCLERS
• BACTERIA
• FUNGI
• SOME ANIMALS

10. Decomposers
BACTERIA
EARTHWORMS
FUNGI

11. WHAT ARE FOOD CHAINS?

15. FOOD
WEBS

20. DECIDUOUS FOREST
FOOD WEB

21. DECIDUOUS FOREST FOOD WEB
The arrows connect the prey (diet) to the predator
(consumer). The colored dots on the animals are coded to
the colors in the triangular diagram at the upper right.

26. ARCTIC MARINE FOOD WEB

31. FRESHWATER FOOD WEB

32. POND FOOD WEB

36. ECOSYSTEMS DEPEND
ON THE BALANCE OF
THEIR FOOD WEBS
•The loss of one organism may tip
the delicate balance of survival
for many other organisms within
that ecosystem.