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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).
During summer-stratification in Lake Vechten (May–October) a great number of chemical parameters show variations. The concentration patterns of calcium, manganese and iron have been studied in some detail.
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 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...
In 1974 an introductory comparative limnological study was made in three deep man-made lakes in the province of South Holland.
In two brooks, at about 1000 m altitude, drift rates were measured at hourly intervals during 48 hours.Hydracarina were day-active with a maximum drift rate coincidently starting with the increasing phase of the sinusoidal water temperature curve. Nymphs ofEphemeroptera andPlecoptera as well as...
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