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the sum of all the organisms living within its boundaries and the abiotic factors with which they interact
amount of light energy converted to chemical energy by autotrophs during a given time period
gross primary production
the amount of light energy that is converted to chemical energy by photosynthesis per unit time
net primary production
equal to gross primary production minus the energy used by the primary producers for respiration
total biomass of photosynthetic autotrophs present at a given time, whereas NPP is the amount of new biomass added in a given period of time
depth of light penetration affects primary production through the photic zone of an ocean or lake
element that must be added for production to increase. adding other elements will do little to nothing to increase production
when cyanobacteria and algae surge because of excess nutrients added to water. reduce oxygen and clarity of water
annual amount of water transpired by plants and evaporated from a landscape
the amount of chemical energy in a consumer's food converted to their own new biomass during a given time period
the percentage of energy stored in assimilated food that is not used for respiration
green world hypothesis
states that terrestrial herbivores are held in check by various factors, like plant defenses that prevent herbivores from eating up all the plants`
the amount of added nutrient, usually nitrogen or phosphorus that can be absorbed by plants without damaging ecosystem integrity
lowers the pH of streams and lakes and affects soil chemistry and nutrient availability
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