Transcript Food Webs - Ms. Nakamura`s Biology Class Wiki

D.N.A
Objective: SWBAT analyze an ecosystem’s energy
flow through food chains and food webs
1. What is the difference between a producer
and a consumer?
•Producers are able to produce their own food and energy
•Consumers depend on others for food
2. Herbivores are what kind of consumers?
PRIMARY CONSUMERS
3. Carnivores have to be at least this level of
consumers
SECONDARY CONSUMERS
SELF
Nourishment
(feeding)
As in AUTOPILOT!
Autotrophs
are
also
known
What
does
the
prefix
What are examples of organisms that
as Producers
make
their
own food (AUTOTROPHS)?
“auto”
mean?
How do autotrophs produce their
own food?
Energy from
The
SUN!
What if there is no sunlight?
Deep sea bacteria live at
ocean depths too great for
light to reach, thus
photosynthesis cannot
occur. Yet, these bacteria
still make their own food
(sugars).
What is this process called?
Chemo synthesis
Other
Nourishment
(feeding)
Heterotrophs are also known
as Consumers
What are examples of organisms that eat other
What
does the prefix
organisms (HETEROTROPHS)?
“Hetero” mean?
Basic Food Chain
• Arrows show the
movement of energy
• In this example
energy flows from the
sun to the plants to
the rabbit to the owl.
FOOD WEBS
• Multiple Food Chains connected together
• Shows how organisms relies upon others for
survival and energy
Energy in Ecosystems
Ecological Pyramids-a model which shows how
energy flows through an ecosystem.
Pyramid of Energy
Energy decreases at each
trophic level.
Only 10% of the energy is
passed up each level!
Heat
Heat
Heat
0.1% Consumers
1% Consumers
10% Consumers
100%
Producers
Heat
GUIDED PRACTICE
Eagles
Weasels
Rabbits
Snakes
Field Mice
Grasses
1.Identify the…
a. Producer(s)
Trees and Grass (Level A)
b. Primary Consumers(s)
Elk, Rabbit, Mouse, Frog,
Cricket (Level B)
c. Secondary Consumers(s)
Lion, Snake, Hawk (Level C)
If the field mice were
eliminated due to farming,
what organisms would be
greatly affected? Why?
•The snake and hawk
because they depend on
the mouse for food
•Larger population of
crickets
If the Elk were to go extinct,
would the mountain lion be
affected?
Yes, because it needs the Elk
for food
How might the mountain lion
deal with losing this source of
energy?
The mountain lion will eat
more of the rabbits
How might this affect the
other organisms in the food
web?
The hawk is losing a source of food if the mountain lion eats
more of the rabbits
Under the Sea! – Marine Food
Web Activity
1. Get into a group of 4
2. Each team is given a game board, trophic
level chart, organisms pictures, one pair of
scissors, and a glue stick
3. You have 20 minutes to correctly place the
organisms on the game board using the
clues on the trophic level chart!
EXIT TICKET!
HOMEWORK – FOOD WEB POSTER!
Due October 12
• Must contain at least 8 organisms
• Found in the same ecosystem (pond, desert, rainforest, ocean
– Energy source (sun)
– Producers, Primary Consumers, Secondary Consumers,
Tertiary Consumers, one Decomposer
• Properly labeled using vocabulary words
• Trophic levels are identified
• Transfer of energy is shown in the right direction (arrows)
RACE TO THE HSA
RACE TO THE HSA
• Each class will start off with 10 points for
the day
• Points will be deducted if the class is not
following our classroom norms
• The class with the most points at the end of
each month will win!
RACE to the HSA
• What type of prizes will be offered?
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Breakfast party
Pizza party
Icecream social
Field Trip
Guest Speakers