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In Lake Vechten, a sandpit near the city of Utrecht (The Netherlands), the submerged macrophyte vegetation is dominated by two species, namelyCeratophyllum demersum andElodea canadensis. In the course of the year both species are able to develop two distinct forms: the normal vegetative form in...
A micro-ecosystem or microcosm is a collection of organisms belonging to various trophic levels composed in the laboratory in such a way that their mutual relations are similar to those found in nature. The aim of making a micro-ecosystem is twofold:
creating the possibility to make more...
From 75-08-18 to 75-08-26, the Netherlands Hydrobiological Society investigated during a field research trip the influence of the dimensions of a ditch on its aquatic communities. With regard to theCladocera no direct relationship was found between the dimensions of the ditch and the occurrence...
The studies on the phyto- and zooplankton interrelationships in lakes Vechten and Tjeukemeer are in progress since 1972. For detailed description of the lakes and the techniques employed see GULATI (1974, 1975).
A clone ofScenedesmus quadricauda, isolated from Tjeukemeer, exhibits a high degree of morphological variation in synchronized cultures. Cells are synchronized by light-dark cycles. During the photoperiod they build up the capacity to divide. First division into 2- and 4-celled coenobia is...
In august 1975, together with other field situations, the diatom composition of a ditch near Tienhoven was studied. Special attention was given to the importance of the different macrophyte species for their epiphytic diatoms. On 5 different sampling stations several parts of every macrophyte...
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