Transcript Eating for Energy

Eating for Energy
How does energy flow through a food web?
How do organisms interact with each other and
with the environment in which they live?
Why do animals need to eat?
Why do animals need to eat?
Food provides energy for
animals to survive.
Survive means to grow and
reproduce.
Invertebrate card
Sketch the
organism & copy
the name onto a
post-it note
Invertebrate card
Sketch a picture of
an organism the
invertebrate eats
on a post-it note;
include name and
its diet
Invertebrate card
Sketch a picture of
an organism that
eats the invertebrate
on another post-it
note; include name
and its diet
Invertebrate Card
O Discuss with your partner your invertebrate,
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what it eats, and what eats it. LOOK for any
overlaps between your invertebrates.
Same food item (prey or plant)?
Same predator or prey?
ARRANGE YOUR POST-IT NOTES on the
butcher paper to make a FOOD CHAIN.
What other prey or predators might link your
organisms?
FOOD WEB
O Create a model that represents interactions
between organisms in a pacific northwest
forest ecosystem.
O A FOOD WEB is used by scientists to
describe and understand how forest
ecosystems function.
O Food chain is a linear model and a food web
shows multiple branches and interactions.
Can you place organisms in your
food web?
O Draw pictures of additional organisms you think need
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to be included.
Make sure you have several autotrophs in your food
web. (Use the post-it notes)
Circle all the producers in green, primary consumers
in yellow, secondary or higher consumers in red, and
decomposers in blue.
Chemical energy can be transferred from one
organism to another. Draw in arrows to show this
transfer of energy FROM the food TO the eater.
Your food web must include at least 20 organisms
and 30 arrows.
Unique to this food web
O Northern Spotted Owls
O Flying squirrels
O Pileated Woodpeckers
O Truffles (fungi)
O Can you place these species in your food
web?
Can you place the Northern
Spotted Owl in your food web?
O Pileated Woodpecker excavates holes in
trees. When they abandon these holes,
flying squirrels use them as nest sites. The
fungi grow on the forest floor. Their roots
spread across tree roots and help the trees
acquire important nutrients. Flying squirrels
eat the fungi.
O What would the food chain be for this
sequence?
Can you place the Northern
Spotted Owl in your food web?
O Food Chain: OWL eats SQUIRREL eats FUNGI
What are some of the reasons the
Northern Spotted Owl is an
endangered species?
What are some of the reasons the
Northern Spotted Owl is an
endangered species?
O They build nests in very large old conifer
trees(old growth) and there are very few of
these trees left. Without very large trees,
the spotted owl can’t reproduce.
O They feed on flying squirrels as well as other
rodents, amphibians and birds.
What if…
O A population of wolves were introduced to
the area?
O How would the presence of wolves affect the
organisms in their food web?
O What do wolves eat?
O What eats wolves?
O Would this species affect the food web?
What if…
O What animal population could be introduced
that will not affect the food web very much?