Titlebook: Netherlands-Wetlands; Proceedings of a Sym E. P. H. Best,J. P. Bakker Conference proceedings 1993 Springer Science+Business Media Dordrecht

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Vertical-migration patterns of flagellates in a community of freshwater benthic algaee of the sediment at different times of day. Numbers of three species of chrysophycean flagellates and . increased again on the sediment surface after dark. Under continuous irradiance at 10°C, the migration cycle of all five groups of flagellates was affected. Some evidence for an endogenous nature

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hese versatile programs greatly enhance the understanding of the mathematics in these topics. Qualitative analysis of the pictures leads to quantitative results and even to new mathematics. The MacMath programs encourage experimentation and vastly increase the number of examples to which a student m