Names: _____________________________________________________
_____________________________________________________
Date: _______________________
Per: _______
Build a Marine Food Web Activity
Directions: You may work by yourself or with a partner.
1. Fill out the Student Table Worksheet for the 12 organisms (back of this sheet).
2. Build a marine food web with the 12 organisms provided.
 Cut out the 12 organism cards
 Arrange them into your food web on a piece of construction paper
 Glue the organism cards to the construction paper
*Do NOT glue until you are sure you are ready!
 Draw arrows to show energy transfer between organisms
3. Label the organisms as:
a. Primary producers
b. Primary consumers
c. Secondary consumers
d. Tertiary consumers
e. Quaternary consumers
f. Decomposers
4. Answer the after activity questions.
After Activity Questions:
Describe what would happen to your food web if the following scenarios took place:
1. A large commercial fishing company triples their annual catch of red cod in the area.
2. The land on the edge of the estuary is converted to intensive farming. There is a big
increase in agricultural run-off and nutrients into the estuary. This increases the risk of
phytoplankton blooms.
3. Due to increased carbon emissions, the ocean is becoming more acidic. Bryozoans and
other shelled animals will no longer be able to make shells.