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law of conservation of mass
matter cannot be created or destroyed
detritvores/decomposers
fungi and prokaryotes
detritus
nonliving organic matter
primary production
the amount of light energy made to chemical energy by autotrophs during a period of time
gross primary production (GPP)
total primary production
net primary production (NPP)
GPP minus energy used by primary producers for autotrophic respiration
limiting nutrient
the element that must be added for production to increase in an area. nitrogen and phosphorus most often limit marine production
eutrophication
caused by the addition of large amounts of nutrients to lakes
secondary production
the amount of chemical energy in food converted to new biomass during a period of time
production efficiency
the fraction of energy stored in food that is used for secondary production
trophic efficiency
the percent of production transferred from one trophic level to the next, on avg 10%
biogeochemical cycles
nutrient cycles; involve both biotic and abiotic components
Note 
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