Download Food Webs PP

Do Now: Friday the 13th
(HW Check)
Objectives:
1. Define producer, consumer, decomposer,
heterotroph, autotroph, food chain, and food web.
2. Construct and analyze a food web model
of the organisms found in a marsh ecosystem.
Task:
What type of molecules are always made by
producers, but rarely by consumers?
Food Webs
A diagram that represents
feeding relationships
between populations in an
ecosystem.
Any
Surprises?
Populations can be
producers, consumers, or
decomposers.
Try to put all of the
organisms in the food web
shown into those 3
categories
It’s all about ENERGY!
• PRODUCERS get their energy from
inorganic sources (like sunlight) AKA
autotrophs
• CONSUMERS get their energy from
ingesting other organisms. AKA
heterotrophs
• DECOMPOSERS get their energy by
breaking down the macromolecules of
dead organisms
Energy flows
through
ecosystems
The arrows show the
direction in which energy
flows through this
ecosystem. What is the
source of energy for the
entire community
shown?
What do you think a
“secondary consumer”
is?
Food Chains and Food Webs
•A food chain is a single
linear pathway energy may
flow through an ecosystem
•A food web is a network of
the food chains in an
ecosystem
Food Web Activity
• We will begin – but not finish the food web
activity today. DO NOT ANSWER #4-7 YET.
• Begin by categorizing the organisms as
producers, consumers, and decomposers.
• Next, begin arranging the populations and
illustrating the energy flow through the
ecosystem (arrows FROM food TO consumer).
• Finally, answer analysis questions 1-3 AND 812. DON’T DO THE PYRAMID (#4) YET.