Evaluation of basic chemical and microbiological parameters in lake sediments in the protected area of Tajba

Emys orbicularis (Linnaeus, 1758), is a semi-aquatic, fresh-water turtle. Tajba National Nature Reserve (NNR) was declared by the Slovak Parliament in 1966 as an E. orbicularis sanctuary. This study is the first one to perform habitat quality evaluation in Tajba. We collected throughout 2009 in monthly intervals, sediment samples which were analysed for biochemical and microbiological parameters.In addition, we collected surface water samples which were analysed to determine the heavy metal content of five selected elements. Our aims were to provide knowledge regarding the quality of the Tajba oxbow as a E. orbicularis habitat by establishing acceptable ranges for each environmental parameter. Also, we wanted to extend the knowledge regarding each analysed parameters interaction and interface with the other parameters as a part of a holistic complex which is influenced by the surroundings and natural processes. Our results showed that during 2009, there were three main events which led to the elevation in all tested contaminants, resulting in a decrease of water quality and elevated exposure of E. orbicularis to adverse factors which have the potential to harm their survival. The first event in February (human origin indicated), the second event between May to July (agricultural origin indicated); and the third event in September(both urban and agricultural origins indicated)