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1 Polish Journal of Ecology

1 2001

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Changes in the vegetation of softwater lakes under the influence of humic substances

Bociąg K., Szmeja J.

Polish Journal of Ecology

2001

Vol. 49, nr 4

319-326

The effect of dissolved allochthonous humic substances (aDHS) on submerged aquatic vegetation was studied in softwater lakes. It has been found that with increasing aDHS (in the range of concentrations 1.2 to 20.6 mg C dm^-3) the number of macrophyte species decreases (from 17 to 1), the biomass is reduced considerably (86--> 0 g dw m^-2), especially the biomass of the dominants, and the Shannon-Weaver index changes (up to the concentrations of 4.5 mg C dm^-3 the index increases and then decreases). Population areas become increasingly narrow and shifted towards shallow littoral sites. Plant degeneration begins in deep-water sectors. It is not connected with the appearance of new dominants, and leads on to the elimination of all plants from a lake.