1998/01/01 by Norbert Walz, Martin Welker
Environmental Science · #Aquatic Ecosystems and Phytoplankton Dynamics #Soil and Water Nutrient Dynamics #Freshwater macroinvertebrate diversity and ecology
paper · pdf · doi:10.1093/plankt/20.11.2071
The Neuendorfer See is a shallow lake through which the River Spree flows. In the lake, abundances of zooplankton (mainly rotifers) and phytoplankton increased exponentially over the flowing stretch between the inflow and the outflow of the river. Increase in space is enhanced by increased residence time in the lake. Sensitivity of plankton development on residence times of >8 days weakened at longer residence times. This pattern holds for all zooplankton species. Rates of change in chlorophyll and rotifers (after correction for temperature) are first enhanced, then are decreased at longer residence times. Concentrations of dissolved inorganic nutrients [Si, soluble reactive phosphorus (SRP) and NO 3 −] and the N/P ratio diminished with increasing residence time. The plankton dynamics in the lake were dependent on discharge and the lake behaved as a ‘plug flow tubular reactor’ with minor longitudinal mixing. This was not different from the transportation in large rivers.