Creating a Food Web
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Create a food web out of these 19 feeding relationships
Draw a dashed line to separate trophic levels. Organize your food web so that top-level carnivores on
the top of the page while producers are on the bottom. Be sure to label each trophic level.
Draw arrows to show the direction of energy flow (arrows point to the organism that is eating).
1. Decomposers get energy from ALL living
things
2. The Marsh Hawk gets energy from The
Shrew
3. Ribbed Mussels get energy from Marsh
Grass
4. Marsh Grass gets energy from the sun
5. The Shrew gets energy from the Grasshopper
6. The Marsh Hawk gets energy from the
Harvest Mouse
7. The Clapper Rail gets energy from
Sandhoppers
8. The Clapper Rail gets energy from Marsh
Grass
9. The Heron gets energy from Plankton-Eating
Fishes
10. Pickleweed gets energy from the sun
11. The Harvest Mouse gets energy from the
Grasshopper
12. The Heron gets energy from Ribbed Mussels
13. The Harvest Mouse gets energy from
Pickleweed
14. The Sandhopper gets energy from Detritus
15. The Plankton Eating Fishes get energy from
Zooplankton
16. The Clapper Rail gets energy from the
Grasshopper
17. The Marsh Hawk gets energy from the
Clapper Rail
18. Zooplankton gets energy from Detritus
19. Zooplankton get energy from Algae
Left to right: Marsh
hawk, shrew, pickleweed,
heron
Left to right: Ribbed
mussel, sandhopper,
zooplankton
Left to Right: Clapper rail,
marshgrass, algae
SAMPLE FOOD WEB
Trophic Level: _____?_____
Trophic Level: _____?_____
Trophic Level: _____?_____
Trophic Level: _____?_____
Trophic Levels (in alphabetical order):
1 First Level Carnivores (Heterotrophs)
2 Herbivores (Heterotrophs)
3 Producers (Autotrophs)
4 Top Level Carnivores (Heterotrophs)
Extra Credit Question (1pt): How many units of energy are needed at the PRODUCER level to allow for 1,000
units of energy at the TOP LEVEL CARNIVORE level? Write down answer on the back of your food web.