Abstract
Abstract: This study was carried out in the Pilwa Bay of Lake Dobskie located in the mesoregion known as the Land of Great Masurian Lakes, Gizycko district. Temperature and oxygen conditions in the western, central and eastern (connected to Lake Dobskie) parts of the Pilwa Bay were studied by analyzing the vertical distribution of temperature and dissolved oxygen concentrations in the winter and summer seasons of three consecutive years (2005–2007). Measurements were performed using the WTW OxiTop OC 100 system with automatic temperature compensation. During winter stagnation, the highest dissolved oxygen content was noted in the top water layer under ice cover, and oxygen concentrations varied widely between years. An analysis of temperature and oxygen profiles revealed an insignificant temperature difference of approximately 1–2 C between the surface and bottom layers of water, which indicates that the studied bay was not characterized by a summer stratification pattern typical of deep water bodies.
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