Tiny life forms thriving again in Lake Zurich

[Harlequinmania]

While elsewhere species extinction is proceeding at an ever-increasing rate, plankton biodiversity in Lake Zurich is apparently benefiting from rising temperatures and the successful measures against over-fertilization. Begun in the 1970s, this course of action may have a long-term positive effect on fish diversity, although it is too soon to tell. The new species are being watched closely by the water supply company, for some of them can produce harmful substances.

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