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Unit 4 Study Set

ECOLOGY

TermDefinition
Ecosystem A group of interacting organisms and their physical environment
Standing crop biomass the amount of accumulated organic matter found in an area in a given time.
primary production harnessing of sunlight by autotrophs
gross primary productivity energy fixed per unit area, per unit time. by the photosynthetic activity of autotrophs
net primary productivity the rate of energy storage as organic matter after respiration. Weight of biomass per unit area per unit time.
lotic flowing water; streams/rivers
lentic standing water; ponds/lakes
allochthonous produced outside the system
autochthonous produced within the system
secondary productivity the rate at which heterotrophs produce biomass per unit area per unit time
consumption efficiency the ratio of ingestion to production at the next lower trophic level
assimilation efficiency the ratio of assimilation to ingestion (how much are you not expelling as waste?)
production efficiency a measure of how efficiency the consumer is incorporating energy assimilated energy into secondary production
trophic efficiency the ratio of productivity in a given trophic level (Pn) to the productivity of the trophic level its organism feeds on (Pn-1)
Created by: sbc5750
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