Every month since July 2018, the University of Rennes 1 team visits the Lac au Duc in Ploërmel to make measurements and take samples in the water of the lake. The objective is to better understand the seasonal variations of the lake to prevent cyanobacterial blooms.
Claudia Wiegand and Morgane Le Moal made the trip on October 30th, 2018. Thanks to specific tools, Ph, temperature, oxygen, depth, turbidity, total phosphorus, cyanobacteria rate were some of the measurements made directly on the site. They also collected water samples to carry out additional analyzes in the university's laboratories.
At points upstream of the lake, in the centre of the lake and downstream near the nautical club and the golf course, the samples are repeated frequently according to the same precise protocol and the results already show monthly differences. At the end of the study, scientists will be able to determine the ecological state of the Lake and understand the factors of influencing the development of cyanobacteria. This would help to indentify solutions to counter the summer blooms that impact recreational activities such as bathing.