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BIO121-ch4

TermDefinition
biomass living matter
gross primary productivity (GPP) total amount of energy fixed by autotrophs over a given period of time
respiration: (R) release of energy from fuel molecules
net primary productivity (NPP) amount of energy available for storage after respiration, GPP-R=NPP
aerobic respiration releasing energy with use of oxygen
anaerobic respiration obtaining energy from fuel molecules without use of oxygen
estuary semi-enclosed coastal body of water composed of fresh and saline water
trophic levels various levels in ecosystem—producers and successive steps removed from the producers
food chains successive steps within an ecosystem illustrating the energy transfers between organisms as a result of consumption
food webs interlocking change, woven into complex associations
detritus food webs webs based on decomposing plant and animal material or animal waste products
pyramid of energy shows production, use, and transfer of energy from one tropic level to another
10% rule on average, 10% of available energy is actually transferred at each step
pyramid of biomass shows total amount of living material at each trophic level
pyramid of numbers shows relative abundance of organisms at each trophic level
biogeochemical cycles involve living organisms and geologic and chemical factors
Hydrologic cycle all processes that account for the circulation of water through bodies of water, air, and land
gaseous cycle circulation of a gas thru the environment, primarily in the atmosphere, as materials circulate from the air, thru the land and water, and back again
nitrogen fixation process by which certain kinds of bacteria, either free-living in the soil or living in nodules (swellings) on plant roots, convert nitrogen to ammonia
sedimentary cycles involve materials that move primarily from the land to the oceans and back to land again
ecosystem services functions or processes of a natural ecosystem that provide benefits to human societies
Created by: tallzy14