Blue Green Algae

When we first move to Knutsford in 1986 there was no generally recognised problem of blue green algae or cyanobacteria. There was a small sandy beach by the lake in Tatton Park, where people would go to picnic and bathe in the lakewater. Dogs swam in the lake without problem; even daughter’s Westie put his toes in.

Then, in the early nineties, notices began to appear about blooms of blue green algae in the water; dogs should not go in and people should definitely not bathe. They appeared with increasing frequency, and are now a permanent feature. The sandy beach is long gone.

Almost everywhere you go in Britain these algae seem to have got a hold, with a detrimental effect on other wildlife. Last year we witnessed dead Canada geese being removed from Shakerley Mere because of poisoning, suspected to be the very evident blue green algae.

Close up the resulting scum can appear ugly, but can sometimes give almost beautiful effects, as in the following picture.

Ferry Meadows, Peterborough

So what causes these algal blooms and what changed?

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