Spis treści

Seasonal and spatial variations in some physico-chemical parameyers of the River Bonny [Niger Delta], s. 3-17.
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Acidification of the Waksmundzki Stream [The Polish Tatra Mountains] affected by atmospheric pollution, s. 19-28.
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Differentiation of the composition of organic matter in the bottom sediments of the mesotrophic Lake Piaseczno [Leczynsko - Wlodawskie Lake District, Poland], s. 29-42.
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Migration of lead and cadminium in Goczalkowice dam reservoir [southern Poland], s. 43-54.
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The occurrence of magnanese in the Goczalkowice dam reservoir [southern Poland], s. 55-63.
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Changes in the aquatic environmental over many years in three dam reservoirs in Silesia [southern Poland] from the beginning of their existence - causes and effects, s. 65-114.
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Characteristics of the phytobentos communities in the Goczalkowice Reservoir [southern Poland], s. 115-128.
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The composition of microfauna of the biofilm of a Rotating Biological Disc and Rotating Biological Multicage under conditions of high loading with pollutants, s. 129-138.
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Trophic relations between phyto-and zooplankton in a field experiment in the aspect of the formation and decline of water blooms, s. 139-155.
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Water mites [Hydracarina] of three small lakes in the neighbourhood of Poznan, s. 157-174.
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Malacofauna in the watercourses of the Suwalski Landscape Park [Northeastern Poland], s. 175-188.
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Blood dyscrasis in the freshwater Indian catfish Heteropneustes fossilis after acute exposure to a sublethal concentration of propoxur, s. 189-195.
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