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2 Oceanological and Hydrobiological Studies

2 2010

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The structure of phosphorus compounds in mid-forest humic lakes

Joniak T.

Oceanological and Hydrobiological Studies

2010

Vol. 39, No.2

105-112

This study presents the vertical distribution of phosphorus fractions in three postglacial midforest humic lakes: oligohumic, mesohumic, and polyhumic. Total phosphorus concentrations were similar in these humic lakes (mean 76 μg l^-1 P). The greatest share of phosphorus was in mineral fractions, while a lesser share was in organic, especially soluble, fractions. Concentrations of mineral forms (phosphates and polyphosphates) were the lowest at the time of maximum development of phytoplankton, especially of bacterioplankton near the bottom of the oligohumic lake. An exceptionally high participation of soluble polyphosphates was found in the polyhumiclake near the surface.

Diel dynamics of vertical changes of chlorophyll and bacteriochlorophyll in small humic lakes

Joniak T., Klimaszyk P., Kraska M.

Oceanological and Hydrobiological Studies

2010

Vol. 39, No.3

103-111

The diel variability of algal and bacterial chlorophyll and the physicochemical parameters (temperature, pH, dissolved oxygen, conductivity, transparency) in the vertical profile of three mid-forest humic lakes in Drawa National Park (northwest Poland) were analyzed in summer. The euphotic zone consisted of the smaller part of the water column in poly- and mesohumic lakes but almost the whole water column of the oligohumic lake. The 24-hour dynamics of chlorophyll a and bacteriochlorophyll d+e in poly- and mesohumic lake was significantly smaller than that in the polyhumic lake. The maximum concentrations of chlorophyll a and bacteriochlorophyll d+e were observed near the bottom border or below the euphotic zone in waters with oxygen deficits and containing sulfur hydrogen. The main producers of chlorophyll in meso- and oligohumic lake were green anaerobic sulphuric bacteria.