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productivity

Definition

Rate of production of biomass; expressed as production during a specific time interval. Gross: Rate of change in biomass including all losses including respiration during a specific time interval.Net: Rate of accumulation or production of new organic matter or stored energy, less losses, during a specific time interval. Primary: The production of new organic matter by autotrophs, such as photosynthetic algae. This is very often the first step in a food chain. The total amount of organic matter produced per unit time by an individual, a population, an area or a water volume, is termed the gross primary production. When simultaneous losses of organic matter by catabolism (e.g. respiration) are subtracted from the gross primary production, a measure of net primary production is obtained. For photosynthetic algae, gross and net primary production are estimated by the light and dark bottle method.

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