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30 Cards in this Set
- Front
- Back
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study of the distribution and abundance of organisms and the flows of energy and materials between abiotic and biotic components of ecosystems
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ecology
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specifically looks at abiotic environment
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ecosystem
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plant biomass that grows each year
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net primary productivity
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store chemical energy
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light reactions
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make sugar from carbon dioxide
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dark reactions
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GPP - Rp =
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NPP
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plant resources control ...
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NPP
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light, temperature, Water, carbon dioxide, nutrients
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plant resources
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responsible for 33% of terrestrial NPP
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tropical forest
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use more than 40% of the Earth's annual NPP
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humans
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ration of net productivity at one trophic level compared to net productivity at the level below
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ecological efficiency
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ecological efficiencies are ...
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5-20%
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enery you live on
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assimlated energy
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what you eat
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ingested energy
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what you poop
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egested energy
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assimilated energy - respiration - excreted energy =
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production
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proteins naturally breakdown
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excreted energy
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primary producers
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plants
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use most of assimlated energy for maintenance
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herbivores and carnivores
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inversely related to activity level
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net production efficiency
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use most net production efficiency
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ectotherms
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assimilation efficiency X net production efficiency
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gross production efficiency (%)
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proportion of production at one trophic level that's consumed at the next higher trophic level
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exploitation efficiency
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proportion of energy at one trophic level that is converted to biomass at a higher trophic level
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ecological efficiency
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increases at higher trophic levels
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assimilation efficiency
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decrease at higher trophich levels
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net and gross production efficiencies
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average about 10%
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ecological efficiencies
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ends up as production in the third trophic level
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1% of NPP
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reatained within the ecosystem
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nutrients
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between the organisms and the physical environment
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continual recycling
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