The frequency of blooms of cyanobacteria in the tidal waters of the Chesapeake estuary has increased from about 13 per year in the 1990s to 23 in the 2000s. (sciencedaily.com)
As this nutrient enrichment, or «eutrophication» increases, so will the proportion of toxin - producing strains of cyanobacteria in harmful algal blooms, scientists said. (sciencedaily.com)
That is likely what happened to the oxygen produced by cyanobacteria early in Earth's history. (sciencedaily.com)