Algal Toxins - More reasons to clean up Lake Winnipeg
Thursday evening, with Dr. Gordon Goldsborough and the Friends of the Delta Marsh Field Station, I had the opportunity to hear Dr. Brian Kotak talk about algal toxins. Brian has done his Ph.D. work on algal toxins and now has his own company - Algal Toxins International which is based in Pine Falls, Manitoba.
The title of Dr. Kotak's talk "Lethal Brew - Toxic Algae Stewing in our Waterways." gives you an idea about his talk. He did not mince words. He got right into the details of severe very bad characters - nerve toxins and a liver toxin which are produced by algae.
The nerve toxins, or neurotoxins include saxtoxins and anatoxin a(s). He talked about peta-methylamino-L-alanine (BMAA) and provided some evidence that BMAA may be a cause of amyotrophic lateral sclerosis (ALS)/parkinsonism-dementia complex, and referred to evidence that BMAA has been isolated from the brain tissue of patients succumbing to Alzheimer's disease. It sounds worrisome, and raises concerns about long term chronic exposure to low levels of these toxins in drinking water under some conditions. Dr. Kotak mentioned that algae and their toxins are removed from drinking water by activated charcoal filters, but are not necessarily adequately removed by other methods.
As to the main liver toxin (called a hepatotoxin) produced by algae, this one is called microcystin LR. Dr. Kotak has spent a lot of time measuring this toxin and has found disturbingly high levels under some circumstances in Manitoba lakes.
All this adds urgency to the clean up of our lakes.
























