Photo: Petr Znachor, Czech Academy of Sciences
Visitors to the Lipno Reservoir in South Bohemia witnessed something unusual at the end of last year. The ice on the lake turned green, a striking sight in the middle of winter. The cause was an unexpected build-up of cyanobacteria trapped beneath the frozen surface.
Cyanobacteria are a common sight on Czech ponds and reservoirs, particularly in the summer months.
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Author: Ruth Fraňková