Mack said similar incidents had been reported elsewhere around the country following recent heatwaves.
She said: “This naturally occurring toxin is more commonly found during the warmer months.
“Due to the prolonged hot and dry weather we have experienced, water levels in St George Park have reached historic lows, creating conditions in which the toxin can thrive.”
The authority has put posters up around the park to inform people about the issue.
Members of the public are also urged not to touch sick, injured or dead animals, to keep their dogs on a lead and out of the water, refrain from feeding wild birds and to avoid contact with the water.
Anybody that finds a sick, injured or dead bird is asked to report it to the council.
BBC News
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