Invasive Plants and Algae in the Water of the Lake

Invasive Plants It is hard to tell which plants that grow in the lake are truly native species.  Since the formation of the lake, we are sure the diversity of the plant population in the lake has changed dramatically as natural ageing forces occurred and certainly with the actions of early settlers.

Before European settlement, Lake Scugog was ageing into a shallow wetland with all the diverse shallow water, wetland species.  The construction of the dam in Lindsay in the 1830’s obliterated much of the shoreline/shallow water plants that had been in such abundance such as cattails, bulrushes, arrowhead, wild rice and even cranberries in ancient acidic bogs around the lake.

Invasive SpeciesPhosphorus and nitrogen running off the land and released from the decomposing swamps must have turned the lake to a green soup, thick with algae.  This would have robbed the lake of oxygen and most of the fish would have died.   Therefore, much of the species of fish and plants that we have in the lake now may be relative newcomers.

The lake is still changing.   Every year cycles of species erupt and dominate and then subside perhaps in one year, or perhaps for many years.  But, every year is different for this large, shallow lake.

Invasive SpeciesLake Scugog will never be a pristine northern lake and it is aging to eventually become a wetland area, but it is and will be for hundreds of years to come a very precious, healthy environment for fish, shorebirds, water fowl, raptors, songbirds, reptiles and much more which we can all view with relative ease right from our home windows and gardens.


One invasive aquatic plant, Eurasian water milfoil, has the ability to dominate our lake and make it both unattractive and impossible for recreation.  Scugog Lake Stewards Inc. is combatting this invasion with a bio-control, the Milfoil Weevil.  Read our most recent information on this topic, and what our program is for 2010 on the Home page of this website.


Information to come.

Scugog Lake Stewards, April 2010