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The macrophytes of the middle course of the saale river east germany and their biomass

, : The macrophytes of the middle course of the saale river east germany and their biomass. Limnologica 10(1): 57-72

A Fontinalis moss association, comprised of F. antipyretica, Hygrohypnum ochraceum and Platyhypnidium rusciforme, occurs in clear, relatively unpolluted, cool and fast flowing water over a stony bottom, mainly between Eichicht and Fischersdorf [East Germany] and indicates oligosaprobic conditions. A Ranunculetum fluitantis association, containing Ranunculus fluitans, Sparaganium emersum ssp. longissimum, Potamogaton crispus, P. pectinatus, P. natans, Callitriche hamulata, Myriophyllum spicatum and Elodea canadensis occurs in clear to lightly polluted, fast flowing, turbulent water over a stony-gravelly bottom with high amounts of sand and mud. It can tolerate, and is even improved by, light pollution, and indicates .beta.-mesosaprobic conditions. A P. pectinatus association with S. emersum and occasionally M. spicatum which occurs in more heavily polluted water over a muddy-sandy to gravelly bottom, is the most pollution resistant and indicates .alpha.-mesosaprobic conditions. The biomass per m2 of the moss association was 40-225 g dry mass (mostly 100-200 g), that of the Ranunculetum fluitantis association was usually 300-350 g, sometimes reaching 600 g and that of the P. pectinatus association was 150-300 g. Mixed stands of P. pectinatus and M. spicatum have a fairly constant biomass of 400 g/m2. These figures are higher than those for similarly structured associations in non-flowing water.

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