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The seasonal succession of the plankton in the marine brackish Lake Grevelingen, a closed sea arm in the S.W.-Netherlands, comprises the initial stagessensu Margalef and is characterized by predominantly small phytoplankton (flagellates, diatoms) and zooplankton (rotifers, tintinnids, copepods),...
Temperature and dissolved oxygen content measured weekly at various depths during 3 1/2 years in the filling phase of a tropical man-made lake, show that at the dam-site fluctuations of epilimnion values occurred, whereas the hypolimnion remained almost constant in temperature and permanently...
Instantaneous gross growth efficiencies ofDaphnia magna were determined at different temperatures. An optimum was found at 9°C while at temperatures above 22°C negative efficiencies were found.
A formula is derived, in the setting of a distributed-parameter population model, for the net production of a population structured in weight, in the case of continuous reproduction.
The expression is consistent with Thienemann's definition of production.
A method is described with which algal production can be estimated if irradiance above and under water are known and the relationship is determined between production rate and irradiance. Large numbers of water samples can be quickly and efficiently processed. Some of the equipment developed and...
A summary is given of two papers, presented by the authors at a seminar held for members of the Netherlands Hydrobiological Society. A simple model for photosynthesis is described that leads to a new relation between production rate and light intensity. This relation gives a better fit to...
A fast (30 samples/hour) and precise method is described, which can be used for both sea and fresh water in measuring dissolved organic carbon over a range of 0,1–10 mg C/liter. At this moment we are testing the efficiency of this D.O.C. analyser against flame ionization detection system.
The huge numbers of molluscs, worms and bacteria found in the sheltered tidal flats of the Dutch Wadden Sea, decompose large amounts of organic matter. In this process nutrients incorporated in the particulate organic matter are transferred to the dissolved state. The importance of this process...
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