... tundra streams. The goal of this large-scale comparative studywas to relate inter-biome variability in stream metabolism and nutrient uptake to physical, chem-ical, and biological characteristics. ... assimilate phos-phorus as phosphate (PO3−4), and availability and rate of uptake are dependent on pH. HerbivoresPlant, animal Tissue (organic N)Atmospheric NAmmonia, nitratesAmmonia,AmmoniumLightningDenitrificationNitrificationN ... 5.5Source: Data from Cole and Rapp (1981).Atmospheric CO2 (640)Dissolved total CO2 (30, 000)Algae(5)Bacteria(1,500)Respiration(50)AnimalsBacteria,fungiPlants(450)Dead organicmaterial...