Transcript Slide 1

What is the
source of energy
in this ecosystem?
What path does
energy take to
get to the hawk?
A Food Chain is a simple
model that scientists
use to show how matter
and energy move
through an
ecosystem.
A Food Chain is drawn using arrows to
indicate the direction in which energy
is transferred from one organism to
the next.
Each organism in a food chain
represents a feeding step, or
Tropic Level, in the passage of
energy and materials
A food chain represents only one
possible route for the transfer of
matter and energy through an
ecosystem.
Many other routs may exist.
A Food Web is made up
of many interconnected
food chains and shows
all the possible feeding
relationships within a
community,
Use the diagram
on the right to
answer the
following
questions:
Who is the producer in this food web?
Algae
How many
different food
chains involve
Squid?
4
What are they?
algae  small animals  squid  elephant seal  killer whale
& protists
algae  squid  killer whale
algae  squid  leopard seal  killer whale
algae  small animals  squid  elephant seal  leopard seal  killer whale
& protists
Using what we
know about
energy, how much
energy would be
available to the
leopard seal using
this food chain if
algae begins with
250,000 units?
25
250
2,500
25,000
250,000
250
What about the killer whale? 25