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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 11 | PAGES 2071-2087 | 1998
© Oxford University Press

research-article

Plankton development in a rapidly flushed lake in the River Spree system (Neuendorfer See, Northeast Germany)

Norbert Walz and Martin Welker

Institut fuür Gewdaässeroökologie und Binnenfischerei Muüggelseedamm 260, D-12562 Berlin, Germany

Received on November 14, 1997; accepted on June 22, 1998 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 NO3–] 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.


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