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Notes on lecture 36 from ecology in Biology1A from the University of Glasgow £5.49   Add to cart
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Lecture notes

Notes on lecture 36 from ecology in Biology1A from the University of Glasgow
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just some notes I took in the lecture. they may not be perfect and may not include everything that you need to know on the topic, but maybe they can help someone

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  • December 1, 2022
  • 4
  • 2022/2023
  • Lecture notes
  • Neil metcalfe
  • Lecture 36

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lecture 36 — trophic structure

the importance of energy


all organisms need energy
get it from the sun, chemicals or each other
in most ecosystems, energy comes from sun, converted into organic molecules by
primary producers in photosynthesis


total amount of energy generated by autotrophs in an ecosystem = Gross Primary
Production (GPP)
but autotrophs use up energy themselves
so a more important measurement is NPP
Net Primary Production (NPP) = how much energy is available to other organisms
NPP = GPP — respiration by autotrophs
NPP is roughly half of GPP
NPP varies dramatically across earth (see ppt for map)
tropical rainforest is the highest
virtually nothing in sahara and the poles
there are big chunks of the ocean where not much NPP

greatest in equatorial regions, with high rainfall



limitations on NPP
the rate of NPP is usually constrianed by one of the following:

energy (e.g. temperature, light penetration of aquatic ecosystems, etc.)



lecture 36 — trophic structure 1

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