Globally, corals occur in a salinity range between 32 and 40 PSU (practical salinity units), although coral reefs also thrive in exceptionally high and low salinity conditions. More important than average salinity concentrations, however, are sudden decreases in salinity due to high freshwater input by rivers or torrential rains. Decreased salinity is seen as a second factor for the disappearance of massive coral reefs in front of large river mouths.
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Honestly I think that low salinity levels would kill the coral reef ecosystem because they need salt water to breath and survive.
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