Key differences, features, and comparative analysis of Type and Definition.
| Type | Definition |
|---|---|
| Gross Primary Productivity (GPP) | The rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilised by plants in respiration. |
| Net Primary Productivity (NPP) | GPP minus respiration losses (R). This is the biomass AVAILABLE for consumption by heterotrophs — i.e., herbivores AND decomposers. |
| Secondary Productivity | The rate of formation of new organic matter by CONSUMERS. |
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