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Harmful Algal Blooms in Michigan's Recreational Waters

DEC 5, 2019 / Hamlin Township Hall
• Aaron Parker, EGLE
• Guy #2 Eric??
• Guy #3
Highlights of the meeting covered in attached presentation:
• Cyanobacteria attributes
o Is generally found at 80-90 degree water temperature dying when water temp dip to 42 degrees BUT has been found active in water at 32 degrees Fahrenheit
o Zebra mussel feed on green diatoms, removing a critical competitor for Cyanobacteria food source; allowing Cyno to exist in low nutrient lakes
o Only cyno with a specific gene can produce toxins but NOT all with the gene actually produce toxins (the reason for production vs no toxin production is not understood)
o The bacteria will lay dormant in the lake bottom for years
o The cyno bacteria are moved by the wind
o Algae produces oxygen during the day and respires at night
o There is NO CORRELATION of environmental aspects that supports the prediction of algae blooms lake to lake
o In RARE instances scientists have been able to correlate environmental events to algae blooms in a specific lake
• Summary
o More is NOT known about algae/ specifically Cyanobacteria than is known
o EGLE will respond to specific requests to identify suspect blooms in a lake; but often the bloom has dispersed before they arrive
o Reduction of introduction of nutrients to the lake is definitely beneficial to the reduction of algae opportunities

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Slide 31 Hamlin Lake Preservation Society PO Box 178, Ludington, MI 49431