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The paper presents the differences in metabolic processes of the bottom sediments of the River Raba up- and downstream the reservoir and in the Dobczyce Reservoir (southern Poland). In the sediments of the reservoir character and the intensities of metabolic processes were similar. In the river above the reservoir the metabolizm of sediments has the autotrophic character (the ratio of primary production...
Interactions between phyto- and zooplankton species have been discussed on the basis of literature data and partially of own, rather general investigations. The ways of taking food by zooplankton was reviewed. The literature data on potential consumers of phytoplankton taxa of a different size is presented in a tabular form. Two aspects of interactions have been analysed: influence of zooplankton...
This paper presents the study concerning the influence of hydrocortisone and progesterone on the growth and the content of protein and sugar in the green alga Chlorella vulgaris Beijerinck (Chlorophyceae). Progesterone, at the concentration of 10-4 M, showed a lethal effect on C. vulgaris and hydrocortisone - at the concentration of 10-3 M. Hydrocortisone, in range of concentrations 5×10-5-10-4 M,...
Studies carried out on the alga Chlorella vulgaris (Chlorophyceae) showed that hydrocortisone applied in a concentration range of 10-4 - 10-5 M has a stimulating effect on its growth, i.e. the content of fresh and dry mass, and on the chlorophyll and carotenoid contents. Hydrocortisone was found to have its greatest stimulative effect on the biochemical parameters analysed in a concentration of 5x10-5...
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