Coral Bleaching: is the loss of intracellular endosymbionts through either expulsion or loss of algal pigmentation. Symbiodinium, is also known as zooxanthellae. Under stress, corals may expel their zooxanthellae, which leads to a lighter or completely white appearance, hence the term "bleached".
Causes:
Temperature
Solar Irradiance
Sedimentation
Fresh Water Dilution
Inorganic Nutrients
Xenobiotics
Epizootics
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