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12 Cards in this Set
- Front
- Back
actual evapotranspiration (AET) |
the amount of water lost from an ecosystem to the atmosphere due to a combination of evaporation and transpiration by plants |
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bottom-up control |
control of a community or ecosystem by physical or chemical factors such as temperature or nutrient availability |
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ecological efficiency |
the percentage of energy in the biomass at a lower trophic level that is transferred to the biomass at the next higher trophic level; ecological efficiency varies from approximately 5% to 20% |
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gross primary production |
the total biomass produced by the primary producers in an ecosystem over some interval of time |
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net primary production |
the amount of biomass left over after autotrophs have met their own energetic needs. -is gross primary production minus respiration by primary producers; it is the amount of energy in the form of biomass available to the consumers in an ecosystem |
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primary production |
the production of organic matter, or biomass, by autotrophs in an ecosystem; in most ecosystems, the most significant autotrophs are photosynthetic |
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rate of primary production |
the amount of energy fixed by the autotrophs in an ecosystem over some interval of time |
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top-down control |
the control or influence of consumers on ecosystem processes |
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trophic cascade |
effects of predators on prey that alter abundance, biomass, or productivity of a population, community, or trophic level across more than one link in the food web |
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trophic dynamics |
the transfer of energy from one part of an ecosystem to another |
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trophic level |
trophic position in an ecosystem; for instance, primary producer, primary consumer, secondary consumer, tertiary consumer, and so forth |
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t-test |
a statistical test used to compare pairs of samples of measurements with approximately normal distributions and equal variances |