Best known for what is described as “the most famous picture in limnology,” Lake 226 is an hourglass-shaped lake that changed the world’s understanding of nutrients and algae.
In 1973, scientists installed an impermeable curtain dividing the two basins of the lake. They then added phosphorus, nitrogen, and carbon to one basin and nitrogen and carbon to the other. Within the first year of the experiment, the side with the phosphorous had a large algal bloom, unequivocally demonstrating the direct relationship between phosphorous and algae. The aerial photo showing the contrast between green algae on one side and dark boreal water on the other was instrumental in helping to strengthen phosphorous regulations in Canada and around the world.
Lake 226 has continued to be used for experimental research over the years, contributing to our knowledge of carbon fluxes and lake productivity, as well as the implications of reservoir drawdown.