FOOD CHAINS, WEBS

1

• FOOD CHAINS, WEBS PYRAMIDS

2
sun eclipse with palm

• the ultimate energy source

3
If you are what you eat, what are you?
consumer
omnivore
producer
detritivore
herbivore
decomposer
carnivore
heterotroph
autotroph
4
PRODUCERS

• What are producers?

• Ex. Plants, algae and some bacteria

5
CONSUMERS

• What are consumers?

• Examples deer, rabbits, cows, mice, lions,
  humans, hawks, snakes

6
Where do allthe dead things go?
7
DECOMPOSERS

• What are decomposers?

• Examples bacteria, fungi, insects

8
HERBIVORES

• What are herbivores?

• Ex. Cows, caterpillars, rabbits

9
CARNIVORES

• What are carnivores?

• Ex. tigers, wolves, snakes, hawks

10
OMNIVORES

• What are omnivores?

• Ex. bears and humans

11
Food Chains Food Webs

• Organisms in ecosystems transfer energy from
  organism to organism in feeding relationships
  called trophic levels.

12
Food Chain Example
producer
primary consumer
quaternary consumer
tertiary consumer
secondary consumer
--------
herbivore
carnivore
carnivore
carnivore
13
Food Chains Food Webs

• What would happen in this food chain if all the
  cod were to die?

• What would happen to krill if all algae were to
  die?

• Which is more stable, a food chain or a food web?
  Why?

14
Ecological Pyramids

• Instead of representing trophic levels in a food
  web, an ecological pyramid can be used.

15
Ecological Pyramids
Killer Whale
Leopard Seal
Cod
Krill
Algae
16
Ecological Pyramids
5th TL
4th TL
3rd TL
2nd Trophic Level
1st Trophic Level
17
Ecological Pyramids
Quaternary Consumer
Tertiary Consumer
Secondary Consumer
Primary Consumer
Producer
18
Pyramid of Energy

• What happens to the energy as you go up?

• How much energy is lost between levels?

• Why?

• How much energy is retained?

19
Pyramid of Biomass
What is biomass?
What does this pyramid of biomass illustrate?
20
Pyramid of Numbers
What does this pyramid of numbers illustrate?
21
Ecological Pyramids

• What happens to the biomass, numbers,and energy
  from trophic level to trophic level?

22
Ecological Pyramids

• What is different about this pyramid?

23
Pyramids of Aquatic Ecosystems

• Numbers
• Biomass
• Energy

24
Pyramids of Temperate Forests

• Numbers
• Biomass
• Energy