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The results are presented of a survey of diatom assemblies in a number of moorland pools and lakes in the Dwingeloo area of Drenthe. Four assemblies, with some intermediate ones, are described. (1) An assembly characterized by an abundance ofFrustulia rhomboides var.saxonica, Eunotia lunaris, E....
From 1971 in situ primary production has been measured in a shallow hypertrophic lake, lake Veluwemeer, with horizontally exposed, glass bottles of 250 ml. In 1980 in situ production and respiration have been measured with 250 ml and 130 ml botties on three different days with 1.5 h incubations,...
The existing and newly collected limnological data of the Linde, a stream in the southeastern part of the province of Friesland, are worked out in more detail. This paper gives an overview of the available water quality data. An inventory is made of historical data.
A multichannel temperature sensor is presented; it is suitable for almost simultaneous measurements at various depths and time intervals. It allows automatic registration of smallscale time/depth variations of temperature in floating masses of filamentous algae and similar thermally stratified...
The food composition in the guts ofDaphnia hyalina was compared with the phytoplankton composition in the lake water on several dates during the year. The guts contained almost exclusively algae; detritus was not an important food item. ExceptOscillatoria agardhii, all large algal forms were...
For the quantitative collection ofCorophium volutator from samples which contain a large amount of detritus a sorting method has been developed using the swimming behaviour ofCorophium volutator as a starting point.
The factors determining life conditions in running waters can be arranged in a hierarchical scheme. One of the main factors is stream velocity, which is described by Manning's formula. By transformation of the formula a set of variables is acquired with which a diagram is constructed to contain...
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