Transcript Slide 1

BIOL 3240 Plant and Animal Ecology
Primary Production – Energy Flow
© Getty Images/Taxis
What is primary production?
What influences primary production?
What is Gross primary production?
What is net primary production?
BIOL 3240 Plant and Animal Ecology
Primary Production – Energy Flow
© Getty Images/Taxis
• What influences
Primary
production?
What differences?
Why?
Discuss with your neighbor…
• Why was precipitation alone (without temp)
sufficient to account for most of the variation in
grassland primary productivity?
• How are the desert dune and tundra ecosystems
the same?
• How would actual evapotranspiration (AET) and
net primary production in the desert system
(hot desert) and the tundra system likely respond
to a significant increase in precipitation?
What factors explain this variation?
What would
happen if
you
manipulated
the
abundance
of these
food web
participants?
If consumers use 66% of primary
productivity on Serengeti… what is the
impact on PP?
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Effective at any level?
Trophic Dynamic View of Ecosystems
As energy is transferred from one trophic level
to another, energy is degraded:
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Energy quality decreases with each
successive trophic level.
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• How are isotopes useful in
ecology?