,” wrote Susan Haven in a news article for the Honolulu Star-Advertiser.
The cause of the shocking magenta-colored water in the Hawaiian refuge is an algal bloom. An algal bloom is an increase in the density of microscopic, single-celled algae, or phytoplankton, in an area of the ocean. These blooms of algae can be caused by a variety of nutrients entering the ocean from agricultural runoff, sewage outflows, or naturally occurring processes. When these nutrients combine with warm or sunny weather, the result can be an explosion of algae, which can tint the water in a variety of colors, from a golden brown to a shocking magenta, as seen in this Hawaiian refuge.