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The habitat preference as regards depth and vegetation areas is discussed for a number ofPiona species.P. conglobata mainly walks over the water plants and undertakes swimming excursions of short duration from there.Arrenurus crassicaudatus is a bottom dweller.
During three successive years the zooplankton community of a small fresh water lake was sampled and counted weekly. A critical survey is given about the statistical methods employed in plankton research; much depends on sampling and subsampling strategies. It is shown that log-transformation is...
A study was made of vertical distribution of phytoplankton and zooplankton, primary production and grazing in a stratified lake, over a period of 24 hours. Photoresponse curves, made at sunrise and noon, showed great differences. Phytoplankton sampled from 0–5 m and from 5–10 m reacted more or...
In addition to the earlier published late winter/spring diatom (Asterionella, Stephanodiscus, Fragilaria andCyclotella) succession (1977–1980), data on diatom summer and autumn pulses, and on the occurrence of maxima of other predominant algae (flagellates) in the epilimnion (which was...
The littoral vegetation starts its development only in June and reaches its highest expansion in autumn. By that time the organic debris from these plants starts to play an important role for detritivorous organisms. The quantitative development of the fauna in the littoral is highest in autumn...
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