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Producers
·Photosynthetic organisms that manufacture organic substances using light
energy, water and CO2
· PHOTOSYNTHESIS EQUATION: 6CO2 + 6H2O + energy C6H12O6 + 6O2
Consumers
·All organisms that obtain energy by consuming other organisms
·Those that directly eat producers are PRIMARY consumers ­ first in the chain
·Those that eat the primary consumers are secondary consumers
·Those that eat the secondary consumers are tertiary consumers
·Secondary and tertiary are usually predators but can also be scavengers or
parasites
Decomposers
·Producers and consumers die and the energy they contain can be used when
the complex materials are broken down into single components again
·In breaking these materials down they can be absorbed by plants and be
recycled
·Majority of this is done by decomposers (fungi and bacteria) and some by
detritivores (earthworms)…read more

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TROPHIC LEVEL
REFERS TO
NUTRITION Food chains
Food Chains
·Food chain ­ relationship in which producers are eaten by primary, who are eaten by secondary,
who are eaten by tertiary.
·Each stage in the chain is a trophic level…read more

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http://www.youtube.com/watch?
v=ttpNGJcpJ68…read more

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Food Webs
·Within a habitat many
food chains will be
linked together to form
a food web
PROBLEM IS THE
COMPLEXITY
1.A producer can be
eaten by several
different organisms
etc.
2. Charting all feeding
inter-relationships is not
feasible
3. relationships are not
fixed, they depend on
times of the year…read more

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