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Algae of Gratiot Lake 
Working under the guidance of Mike Scheiwe of Headwaters Environmental Station, Robert Heyman carefully examined microscopic algae from the lake.

Twenty five genera of algae were found. Overall, the diversity of algae found indicate that Gratiot is a healthy lake.

Among the types observed were Tabellaria and Cyclotella which are usually indicators of clean water. Robert found Cllosterum a species that sometimes clogs water filters. Gloeotrichia forms spherical algal colonies visible to the naked eye. An abundance of Gloeotrichia was observed when hot summer weather prevailed. Contact with such ‘blooms” of Gloeotrichia can cause skin irritation.


Below are some of Robert's sketches.



Closterium sp.


Pedistrum sp.



Zygnema sp.

Tabellaria sp.


Cyclotella sp.



Ceratium sp.

GRATIOT LAKE CONSERVANCY
http://www.gratiotlakeconservancy.org
Contact GLC Program Director: director@gratiotlakeconservancy.org
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