f igoten food web review
TRANSCRIPT
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Middle School Science Mrs. Figoten
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In an ecosystem, anorganism’s role depends on:
How it obtains energy &
How it interacts with the other living things in the ecosystem
Organism’s energy role is:
ProducerConsumer Decomposer
ALL LIVING THINGS NEED ENERGY
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Introducing
PRODUCERS
It all begins with plants that make their own food…..
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Herbivores eat plants
Carnivores eat animals
Omnivores eat plants and animals
Scavengers eat dead animals
CONSUMERS CAN BE…
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BACTERIA
FUNGI
SOME SOIL ORGANISMS
DECOMPOSERS ARE NATURE’S RECYCLERS
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“3rd level consumer”
“1st level consumer”
“2nd levelconsumer”
consumer
Food chains show the flow of energy through consumer levels
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CONIFEROUS FORESTFOOD WEB
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ECOSYSTEMS DEPENDON THE BALANCE OF
THEIR FOOD WEBSThe loss of one organism may tip the delicate balance of survival for many other organisms within that food web
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POPULATION SURVIVAL
Limiting Factors
Prevent population from increasing
Can happen if too many predators or not enough food -- changes in food web
Carrying Capacity
Largest population thatenvironment can support
Can happen from changes in food web
Population graph goes up & then flattens
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“Carrying Capacity”of Ecosystem
(Most of one species ecosystem can hold)
Rabbit Growth Curve
0
5
10
15
20
25
30
0 2 4 6 8 10 12
Year
Po
pu
lati
on
Siz
e
Population
Population Graph goes up as species multiplies, then flattens
when there is no more food to continue reproducing.
Population of species can no longer grow.
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Series of Predictable Changes
That Happen in aCommunity Over Time
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Changes Over Time WhereNo Ecosystem Existed Before
New GrowthBegins with
Lichen & Mosses
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Bushes &Small Treesafter 20-100 years
Grasses &Small Plantsafter 5-15 years
Mature Hardwood Trees after 150+ years
Lichen & Mosses first few years
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Changes Over Time After a Disturbance Such as a Forest Fire in an Ecosystem
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Mature Hardwood Trees after150+ years