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Algal Blooms, Harmful

Algal Blooms, Harmful

Single-celled algae are almost always present in sea water even if the water looks clear. When high concentrations of certain species of dinoflagellates are present, patches of water look red because these algae contain red pigments hence the name "red tide." High concentrations of other algae may turn sea water orange, yellow, brown, or purple. Red tides have been witnessed for centuries and have been seen all over the world.

Dense concentrations of algae are referred to as blooms, because the algae have multiplied rapidly to become concentrated in high numbers. In a bloom, there could be tens of millions of cells in a liter of sea water. Most ...

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