1. Food Webs: Land and Water
Every organism on the planet, including humans, are connected through a food web.

3. Producers, Consumers, and Decomposers
Make their own food using photosynthesis
Plants, green algae, kelp, phytoplankton

5. Consumers
Eat other organisms for food
Cow, human, eagle

7. Decomposer Fungi and some bacteria
Break down the remains of other organisms
Fungi and some bacteria
Vital to ecosystems because they return important nutrients to the environment

9. Consumers are classified by their food source
Primary Consumers
Eat only producers
A cow eating grass is a primary consumer
Secondary Consumers
Eat primary consumers
Human eating a cow

10. Grasshopper-primary consumer
Toad-Secondary consumer
Grass-producer

11. Food Chain Flow of energy from one organism to next in an ecosystem
Shows flow of energy from producer, to different consumers, and finally decomposers
Shows only one path

12. Food Chain

13. Food Web Many food chains make up a food web Food Web
Interconnected network of food chains within an ecosystem

15. Aquatic Food Web
Food web showing relationships between aquatic organisms

18. Terrestrial food web Terrestrial food web
Food web showing relationships between land organisms

20. Terrestrial and Aquatic Food Webs
They can also be connected
Bear eating fish out of a river
Birds diving for fish in lakes and oceans
Fish eating insects that land on the water

21. Food Chains and Food Webs
Trophic Level
Each feeding level in an ecosystem is located within a tropic level
Organisms at each tropic level take in energy from the organisms they eat

23. Energy Flow Between Organisms-Pyramid
Within an ecosystem, the energy flow between trophic levels does not remain constant
At each level some animals use the energy taken in to perform life processes
Some energy is given off as heat
Some energy is stored in bones and teeth that may not be eaten by another animal

24. Energy Flow between trophic levels
Only 10% of the energy is passed onto the next higher trophic level
Energy in an ecosystem can be measured in total number of animals or combined mass of all animals
Increase a level animals increase in size
Increase a level, animals decrease in number

27. Review

28. 1. Which of these animals is a primary consumer? (eats a producer)B

29. 2. If the producers in an ecosystem produce 250,000 kilocalories of energy, how much energy is available in the third trophic level?
A. 5,000 kilocalories
B. 2,500 kilocalories
C kilocalories
D. 25 kilocalories

30. 2. In a marine food web, which of the following would get its energy directly from the sun?
A krill
B fish
C algae
D killer whale

31. 3. Which of these animals is a secondary consumer?B

32. 4. Which of the following situations show a terrestrial and aquatic food web connection
A. A seagull eating an insect on the beach
B. shark eating a tuna
C. seagull eating a fish
D. bear eating a deer

33. 5. Which of the following situations show a terrestrial and aquatic food web connection
A. A furry bear eating a tasty squirrel
B. An awesome human eating a slow deer
C. A swift pelican eating a large tuna
D. A frisky shark snacking on a cute dolphin

34. Create a terrestrial and aquatic food web poster.
Your food web must have 6 animals
There must be two connections between terrestrial and aquatic food webs.
Identify 1 primary consumer, 1 secondary consumer, and 1 producer.