This year's first cyanobacteria bloom is late compared to last year. It will be of interest to compare dates of lake stratification for these two years. After the winter of uniform water temperatures of 4°C below the ice cover, surface water warms up in spring, and the colder water begins to sink, the spring turnover. Eventually, summer stratification sets in with three layers: the upper, well-mixed warmer water, a middle transitional zone with rapidly decreasing temperatures, the thermocline, and the lowest cold and dark layer, undisturbed and extending to the lake bottom.
Here is a question, yesterday when I looked at the bloom early in the day, the algae seemed to be floating up from a lower level. Below is a little video clip from my phone. Can one tell if it is cyanobacteria?"
See more of Arlene's photos on her Flickr Site.