1. KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.

2. Notice the arrows. Are they pointing in the right direction?
DESERT COTTONTAIL
GRAMA GRASS
HARRIS’S HAWK
Why would the arrows be pointing in this direction?

3. The arrows point in the direction that energy flows!!!!
DESERT COTTONTAIL
GRAMA GRASS
HARRIS’S HAWK
The Desert Cottontail gets its energy FROM the Grama grass
The Harris’s Hawk gets its energy FROM the rabbit

4. A food chain is a model that shows a sequence of feeding relationships.
A food chain follows the connection between one producer and a single chain of consumers within an ecosystem.
DESERT COTTONTAIL
GRAMA GRASS
HARRIS’S HAWK

5. A food web emphasizes complicated feeding relationships and energy flow in an ecosystem.

6. Arctic Marine Food Web

7. African Grassland Ecosystem

8. Desert Ecosystem

9. Wetland Ecosystem

10. Chaparral Food Web

11. Temperate Forest Ecosystem

12. Create-A-Food Web Pg. 410 Must have a title
Producers must form the base of the web
Arrows show direction of energy flow
Organisms must have multiple feeding relationships
Label each organism (Bird, wolf…)
Label producers/consumers

13. Food Web: Bill Nye (21m)

14. At your table please describe these types of consumers:
Herbivores?
Carnivores?
Omnivores?
Detritivores?
Decomposers?

15. Consumers are not all alike.
Herbivores eat only plants. Ex: grasshopper
Carnivores eat only animals. Ex: Lion
Omnivores eat both plants and animals. Ex: Bears
Detritivores eat dead organic matter, including feces (not including scavengers)
Ex: Worms, slugs, sea stars, some flies, millipedes
Decomposers are detritivores that break down organic or dead matter into simpler compounds. Ex: bacteria, Fungi
carnivore
decomposer

16. Specialists are consumers that primarily eat one specific organism (they only eat one thing) Ex: Bamboo is 99% of a panda’s diet
Generalists are consumers that have a varying diet (they eat a lot of different things) Ex: Gray wolf eats elk, moose, deer, and mice

17. Trophic levels are the nourishment levels in a food chain.

18. Tertiary consumers: Carnivores that eat carnivores
Ex: owl eating a mole
ENERGY
Secondary consumers: Carnivores that eat herbivores
Ex: mole eating a grasshopper
Primary consumers: Herbivores that eat producers
Ex: grasshopper eating grass
Producers: Produce their own food
Ex: plants

19. Omnivores, such as humans that eat both plants and animals, may be listed at different trophic levels in different food chains.
If you are eating a salad you are….?
a primary consumer (omnivore eating a producer)
If you are eating a hamburger you are….?
a secondary consumer (omnivore eating a herbivore)
If you are eating shark soup, you are….?
a tertiary consumer (omnivore eating a carnivore)

20. Balance Within A Food Chain (4m14s)

21. Finish: Create-A-Food Web
Pg. 410
Color code and label if it is a producer and/or type of consumer
Producer
Primary consumer
Secondary consumer
Tertiary consumer
MUST HAVE A KEY!!!

22. Create-A- Trophic Level Pyramid
Homework
Create-A- Trophic Level Pyramid
Pg. 86 (On your own)
Think of an example of a food chain
Create a trophic level pyramid using this food chain
Include an Example of a(n):
producers
primary consumers
secondary consumers
tertiary consumers
Make it realistic!