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Cyanobacteria blooms are a major environmental issue worldwide. They can have direct impacts on the safety of drinking water supplies by producing a variety of toxins which also impose health risks for swimmers and boaters. Although many may associate cyanobacteria with bright green algae seen on the surface of lakes, Ellen Cameron, PhD Candidate in Waterloo’s Biology Department, is using DNA sequencing to study cyanobacteria communities in low-nutrient, clear lakes in Northern Ontario.