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Lake Winnipeg covered in algae blooms. (July 2007)
Lake Winnipeg has experienced excessive algae blooms since the 1990s.[1] The lake's toxic blue-green algae has led to a deterioration of water quality, posing hazards to both human and animal ecosystems. The blooms are caused by high concentrations of nitrogen and phosphorus from fertilizer runoff and sewage draining into the lake via rivers and surface runoff.
By 2006, Lake Winnipeg's algae blooms were considered to be the worst algae problem of any large freshwater lake in the world, according to Canadian Geographic.[2] In 2013, Lake Winnipeg was declared the most threatened lake in the world by the Global Nature Fund, due to excessive levels of phosphorus. Attempts to decrease the levels have been unsuccessful. In 2017, it was reported that a five-year effort removed less than 1% of the phosphorus.[3]
Very high levels of the algae toxin microcystin closed Victoria Beach off from the public in the summer of 2003.[4] Grand Beach and other settlements along the lake are often closed during summer months due to E. coli and algae-toxin-related threats. Immense algae blooms covering hundreds of square kilometers have appeared in the northern part of Lake Winnipeg since the 2010s.
^Macdonald, Nancy (August 20, 2009). "Canada's sickest lake". Maclean's. Archived from the original on 2009-08-28.
^Casey, Allan (2006). "Forgotten lake". Canadian Geographic. Archived from the original on 21 November 2010. Retrieved 25 March 2021.
^MacLean, Cameron (2017). "5-year fight removes less than 1% of phosphorus from Lake Winnipeg basin". cbc.ca.
^CBC.ca. (2011). Annual check-up. Retrieved from http://www.cbc.ca/manitoba/features/lakewinnipeg/checkup.html Archived 2010-08-22 at the Wayback Machine
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