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Gross Productivity (GP) – total gain in energy or biomass per unit time.

Primary Productivity – the production of energy by autotrophs , usually measured as biomass per unit time. Secondary Productivity – the biomass gained by heterotrophs as they feed. Usually measured as biomass per unit time.

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Gross Productivity (GP) – total gain in energy or biomass per unit time.

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  1. Primary Productivity – the production of energy by autotrophs, usually measured as biomass per unit time. Secondary Productivity – the biomass gained by heterotrophs as they feed. Usually measured as biomass per unit time.

  2. Gross Productivity (GP) – total gain in energy or biomass per unit time. Gross Primary Productivity (GPP) – gained through photosynthesis by producers. Gross Secondary Productivity (GSP) – gained through absorption by consumers.

  3. Net Productivity (NP) – the gain in energy or biomass remaining after the deduction of losses from respiration (R). This is the biomass available to subsequent consumers. Net Primary Productivity (NPP) – the gain by producers in energy or biomass minus respiratory losses (R). Net Secondary Productivity (NSP) – the gain in energy or biomass by consumers minus respiratory losses (R).

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