Productivity of Podostemum ceratophyllum in the New River, Virginia.

Productivity of Podostemum ceratophyllum, the dominant aquatic macrophyte in the New River, was measured at 4 sites representing soft- and hardwater reaches. Productivity/biomass based on ¹⁴C uptake and standing crop revealed that P. ceratophyllum productivity was inhibited at the softwater sites perhaps due to carbon limitation. P. ceratophyllum is hypothesized to contribute significantly to the New River organic matter budget. -from Authors