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The paper presents the analysis of thermal conditions of coastal Lake Jamno. The long observation series (1971-2013) for the course of surface water temperature suggests its considerable warming (0.28°C∙dec-1). In the monthly cycle, an increase in surface water temperature is observed in all cases except for the winter period (December, January, February). Water was heated the fastest in April (0.58°C∙dec-1) as well as May and September (0.46°C∙dec-1). Mean annual air temperature increased at a similar rate (0.27°C∙dec-1), but the coefficient of correlation of both media equalled 0.40. This suggests that other factors could contribute to the change in surface water temperature. One of such factors could be marine water intrusions. The strongest positive correlations of water temperature in Jamno and water level in the Baltic Sea occurred in the cold half-year, and negative in the warm half-year. From 2013, on the canal connecting Lake Jamno with the Baltic Sea, a storm gate was constructed that altered many processes and phenomena occurring in the lake so far. The paper covers the natural (quasi-natural) period of functioning of the lake, and provides a point of reference for future research on its thermal regime considering among others the effect of human pressure in the form of hydrotechnical infrastructure.
Results of studies on a number of colony-forming units of heterotrophic bacteria, their physiological properties and nutritional requirements in water of Lake Jamno estuary are presented. The density of bacteria showed marked seasonal fluctuation with peaking in summer. Most numerous groups among bacteria studied were ammonifying, proteolytic and lipolytic strains. The smallest groups of them consisted of bacteria hydrolysing starch and reducing sulphates. In the water of Lake Jamno bacteria which for optimal growth required a mixture of amino acids (group A), vitamins (group G) and soil extract (group S) predominated. Bacteria having simple nutritional requirements were not numerous among isolated strains.
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A zooplankton-based study of coastal lakes

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Numerous brackish estuarine water bodies are situated in the Polish Baltic Coastal Zone, including smaller and bigger lakes like Sarbsko, Łebsko, Gardno, Wicko, Kopań, Bukowo, Jamno, Resko Przymorskie, Liwia Łuża, Koprowo and Wicko Wielkie. Despite a similar genesis and geomorphological type, these lakes are characterized by different hydrological and hydrochemical conditions, determined by the predominance of terrestrial or marine factors. The origin of Polish coastal lakes and transboudary water bodies is closely related to the history of the Baltic Sea and the last glaciation. Coastal brackish waters have been inhabited by both marine and freshwater organisms.
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