Net primary productivity (NPP) of an ecosystem is
- Acheck_circle
GPP minus the energy producers spend on their own respiration — the energy actually available to consumers
- B
Total standing biomass of producers — the accumulated organic matter present at one moment
- C
Total photosynthetic energy fixed by producers — the gross primary productivity before any losses
- D
Total energy used by consumers in respiration — the heterotrophic respiration of the ecosystem
Explanation
NPP = GPP − R_autotrophic. Highest in tropical rainforests and coral reefs; lowest in deserts and tundra.