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Blue-green algae in Chilmark Pond, Abel’s Hill lot, September 26, 2020. Photo at 1pm, by Richard DeWitt with conditions sunny, calm, very slight breeze out of the southwest.
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Blue-Green Algae, or Cyanobacteria
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Both the type and the abundance (concentration; cells/mL) of the cyanobacteria matter when it comes to determining health risks to pets humans, and ecosystems. Every pond has cyanobacteria (they are normal members of an ecosystem), and some types produce harmful toxins when they bloom, and many do not.
First, there is no evidence that anyone was exposed to toxic cyanobacteria (a.k.a. blue-green algae) in Edgartown Great Pond (EGP) this season. The type of cyanobacteria that accumulates at the surface of a body of water and forms a toxic blue-green scum was not detected in EGP, as it was in other MV ponds such as Chilmark Pond...
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