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30 Cards in this Set

  • Front
  • Back
study of the distribution and abundance of organisms and the flows of energy and materials between abiotic and biotic components of ecosystems
specifically looks at abiotic environment
plant biomass that grows each year
net primary productivity
store chemical energy
light reactions
make sugar from carbon dioxide
dark reactions
GPP - Rp =
plant resources control ...
light, temperature, Water, carbon dioxide, nutrients
plant resources
responsible for 33% of terrestrial NPP
tropical forest
use more than 40% of the Earth's annual NPP
ration of net productivity at one trophic level compared to net productivity at the level below
ecological efficiency
ecological efficiencies are ...
enery you live on
assimlated energy
what you eat
ingested energy
what you poop
egested energy
assimilated energy - respiration - excreted energy =
proteins naturally breakdown
excreted energy
primary producers
use most of assimlated energy for maintenance
herbivores and carnivores
inversely related to activity level
net production efficiency
use most net production efficiency
assimilation efficiency X net production efficiency
gross production efficiency (%)
proportion of production at one trophic level that's consumed at the next higher trophic level
exploitation efficiency
proportion of energy at one trophic level that is converted to biomass at a higher trophic level
ecological efficiency
increases at higher trophic levels
assimilation efficiency
decrease at higher trophich levels
net and gross production efficiencies
average about 10%
ecological efficiencies
ends up as production in the third trophic level
1% of NPP
reatained within the ecosystem
between the organisms and the physical environment
continual recycling