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Observations made by scientists are helping to understand the massive blooms of microscopic algae in the seas around Madagascar and its effect on the biogeochemistry of the southwest Indian Ocean. Previously it was thought that cyanobacteria called Trichodesmium caused the bloom. However, the 2005 bloom was dominated by a type of phytoplankton called a diatom, the cells of which play host to another cyanobacterium called Richella intracellularis. Trichodesmium played a minor role. [Source: ScienceDaily]
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