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When corals are stressed by changes in conditions such as temperature, light, or nutrients, they expel the symbiotic algae living in their tissues, causing them to turn completely white. Warmer water temperatures can result in coral bleaching. ... This is called coral bleaching. When a coral bleaches, it is not dead. So basically diuron is stressing the plants.

Diuron will cause the coral to bleach.​​​ when the coral expels the algae that are living in their tissues.

  • Diuron simply refers to the trade name for DCMU which is an herbicide and algaecide ingredient that's used in controlling grasses and weeds.

  • It should be noted that diuron affects the salinity of ocean water and this is where coral reefs propagate. This can bring about a long-lasting impact on corals.

  • The algae which the coral polyps feed on is affected by the diuron and this brings about the bleaching of the coral. In this case, the exposure to higher diuron concentrations will lead to the pale or bleaching of corals.

In conclusion, when the corals' bleach, it'll expel the algae that are living in their tissues and then turn to white.

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