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bio paper 2
pyramids of biomass
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Pyramids of biomass show the
biomass
of each
trophic
level in a
food chain
View source
Grass
is the
producer
Rabbits
are the
primary consumer
Snakes
are the
secondary consumer
Hawks
are the
tertiary consumer
View source
Biomass
refers to the
mass
of
living organisms
View source
Bars in the pyramid represent the
total mass
of
organisms
at each
trophic
level
View source
Total mass of organisms
decreases
as you move up the
trophic
levels
View source
Only about
10
% of
biomass
and
energy
is
transferred
up to the next
trophic
level
View source
Reasons for only
10% transfer
:
Organisms don't eat every part of what they consume
Not all consumed parts are absorbed and some are excreted as waste
Most nutrients absorbed are used for energy through respiration rather than growth
View source
Efficiency of biomass transfer calculation:
Efficiency
= (
Biomass transferred
to the next level /
Biomass available
at the
previous level
) x
100
Example:
Efficiency between snakes
and
rabbits
= (
15 kg
/
144 kg
) x
100
=
10.4%
View source
Efficiency between snakes and hawks = (
1.6
kg /
15
kg) x
100
=
10.7
%
View source
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