Energy Flow Through an Ecosystem

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Energy Flow Through an Ecosystem

• Food Chains, Food Webs, Energy Pyramids

If you were in survival mode what is the 1 thing
you would be in search of? Nature is always in
survival mode
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• Begins with the SUN
• Photosynthesis

6CO2 6H2O sunlight chlorophyll ?C6H12O6
6O2
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• Photosynthesis
• Chemical reaction where green plants use water
  carbon dioxide to store the suns energy in
  glucose
• ENERGY is stored in glucose
• Glucose is stored as starch in plants

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Organisms that can do photosynthesis are called
PRODUCERS.
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Producers use most of the energy they make for
themselves.

• Hydroponic plants competing and deciding how to
  expend energy.

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Producers use cellular respiration to supply the
energy they need to live.
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CELLULAR RESPIRATION is the chemical reaction
that releases the energy in glucose.
6O2 C6H12O6 --gt  6H2O 6CO2 energy
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The energy that is not used by producers can be
passed on to organisms that cannot make their own
energy.
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Organisms that cannot make their own energy are
called CONSUMERS.
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Consumers that eat producers to get energy

• Are first order (1st) or primary consumers
• Are herbivores (plant-eaters)

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Most of the energy the primary consumer gets from
the producer is used by the consumer.
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Some of the energy moves into the atmosphere as
heat.
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Some energy in the primary consumer is STORED
not lost to the atmosphere or used by the
consumer itself.This energy is available for
another consumer (predator).
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A Consumer that Eats Another Consumer for Energy

• Is called a secondary or 2nd order consumer
• May be a carnivore or a omnivore
• May be a predator
• May be a scavenger

Side point bear, fox, elk, human skulls and
teeth to tell what eats what
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Most of the energy the secondary consumer gets
from the primary consumer is used by the
secondary consumer.
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Some of the energy is lost as heat, but some
energy is stored and can passed on to another
consumer.
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A consumer that eats a consumer that already ate
a consumer

• Is called a 3rd order or tertiary consumer
• May be a carnivore or a omnivore
• May be a predator
• May be a scavenger

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Consumers that eat producers other consumers

• Are called omnivores
• Omnivores eat plants and animals

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Consumers that hunt kill other consumers are
called predators.The animals that are hunted
killed are called prey.
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Consumers that eat other dead consumers are
called scavengers
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The transfer of energy from the sun to producer
to primary consumer then to higher order
consumers can be shown in a FOOD CHAIN.
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Food Chains Show Available Energy

• Ecological/ energy consequences of eating meat.
• Is hunting ecologically ethical?

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More Food Chains
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Food Webs

• Are interconnected food chains
• They show the feeding relationships in an
  ecosystem

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How Many Chains are in this web?
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Identify the Producers, Consumers, Decomposers
Count the Food Chains!
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Another way of showing the transfer of energy in
an ecosystem is theENERGY PYRAMID
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Energy Pyramids Show

• Amount of available energy decreases for higher
  consumers
• Amount of available energy decreases up the food
  chain
• It takes a large number of producers to support a
  small number of primary consumers
• It takes a large number of primary consumers to
  support a small number of secondary consumers

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