Red tide refers to a large algal bloom of the species Karenia brevis. The algae produces a toxin that affects the central nervous systems of fish and usually kills them. It isn’t directly related to global warming or any other human activity. However, it does tend to occur more in high temperatures, so global warming could have an effect on its frequency.
Red tide is caused by a massive algal bloom of a few different species of microscopic plankton known as “dinoflagellates.” These algae color the water red and also release neurotoxins deadly to most marine life. Blooms can be caused by warm surface temperatures and low salinity, both effects of global warming, and also by high nutrient content in the water and calm seas.
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