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During the workcamps of the Hydrobiological Society in 1966, 1967 and 1968, the distribution of Zooplankton in four ponds in N.W.-Overijssel has been studied. Only the data of 1966 and 1968 of the “Venematen”, related to quantitative results of Crustacea, are to be compared. In 1967 qualitative...
In the last week of june 1968 we collected the larvae and pupae of Ephemeroptera and Trichoptera adhering to Stratiotes plants in an autochtonic swamp succession or the broad “Venematen”. The investigation is a continuation of the research in 1967 and the same methods are used (HIGLER, 1968).
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