Entry Task: Lab Notebook 10/8/14
1. Discuss the Food Web Game
Analysis Questions worksheet with
your group and turn in to the box –
you have 5 minutes!
2. Bring your file folder from the file
cabinet to your desk.
Trophic Pyramid
Learning Target: I can determine which
trophic level each organism occupies and
explain why.
Great Salt Lake Food Web
• Working with your table group…
– Write the name of each GSL organism on a
notecard (hint: Use your initial model)
– Organize the organisms into a food web
– Arrange the organisms by trophic levels
Trophic Levels
• Trophic levels are
what position you
hold in the food web.
• The levels are known
as:
•
•
•
•
•
Producer
Primary consumer
Secondary consumer
Tertiary consumers
Decomposer.
Trophic Levels
– Producer: don’t eat other
things. They make their own
energy by using sunlight.
– Primary consumer: when they
eat producers.
TURN & TALK:
What
– Secondary consumer:
when
trophic
level do
they eat primary
consumers.
decomposers
– Tertiary consumers: when they
occupy?
eat secondary consumers.
– Decomposer: break down and
eat any dead organism.
Trophic Levels
– Producer: don’t eat other
things. They make their own
energy by using sunlight.
– Primary consumer: 1°C =when
they eat producers.
– Secondary consumer: 2°C =
when they eat primary
consumers.
– Tertiary consumers: 3°C = when
they eat secondary consumers.
– Decomposer: break down and
eat any dead organism.
Trophic Pyramids
• To organize a food web we make trophic pyramids.
• All producers go on the bottom, primary consumers
next, secondary consumers third and tertiary
consumers on top of the pyramid.
Energy in Trophic Pyramids
• Energy moves up
the trophic
levels
TURN & TALK:
If you
So
eatwhich
a burger,
are you
because
thedirection
would
energy
move
in
giving
the
burger
upper levels are
a energy
trophicor
pyramid?
Up
is the burger
eating
the
lower
or down?
giving
you
energy?
levels and using
them for energy.
Energy in Trophic Pyramids
• Energy gets lost
at each level due
to:
•
•
•
Energy getting
transformed into
other energy
inside the
consumer.
Not all of the
food is eaten up.
Waste (feces,
urine,
respiration)
Biomass in Trophic Pyramids
• Because energy is
always moving up
the trophic levels
there has to be
more, in numbers,
of the lower levels.
• Due to space
available the lower
levels have to be
smaller in size and
the upper levels
get bigger and
bigger.
Biodiversity of the Lake
• Cyanobacteria is a bacteria. It doesn’t eat because it makes
it’s own energy from the sun.
• Diatoms are algae. They also make their own energy from
the sun.
• Halobacteria are Archaea. They also make their own energy
from the sun.
•
•
•
•
•
•
•
Biodiversity of the Lake
Many organisms live in or near the lake.
Northern Harrier is a bird.
It eats the Avocet, another bird.
Avocets eat Brine shrimp and Brine fly.
Eared Grebe also eats Brine fly.
Brine fly eats Cyanobacteria and Diatoms.
Brine shrimp also eats Cyanobacteria, Diatoms and it’s the
only one that eats Halobacteria.
Great Salt Lake Trophic Pyramid
Tertiary
Consumers
Northern
Harrier
Secondary
Consumers
Avocet
Eared Grebe
Primary
Consumers
Brine Shrimp
Producers
Brine Fly
Halobacteria
Cyanobacteria
Diatoms
Vocabulary Words
Turn to your vocabulary section of your journal and add these
words.
Word
Definition
Trophic
Levels
The position an organism holds in a
food web. (Producers, Primary Consumers, Secondary
Halo-
Greek root word that means “salt”
Consumers, Tertiary Consumers, Decomposers)