Four sampling sites were chosen acr

Four sampling sites were chosen across each lake to ascertain variations in the water composition from one side to the far side of the lake. Each of the sites was in water with a depth of >1 m and approximately 300 m from the shore. Sites were reached by a small motorboat and sometimes by walking across the water. Sampling sites were chosen based on access and equal spacing around lake perimeter. Site positions were fixed by aligning