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Introduction | Identification | Impacts | Causes | Actions | More Info

Why do Diadema outbreaks occur?

Large populations of Diadema are likely caused by the absence of predators that would naturally keep populations densities from growing too large. In the Indo-Pacific, large reef fishes such as larger wrasses, triggerfishes, puffers and porcupinefishes are known to feed on adult Diadema. Nutrient pollution onto coral reefs may also contribute to Diadema outbreaks. Excessive nutrients in reef waters causes algae to grow and outcompete corals for space on the reef. Herbivores like Diadema may be attracted to the area because of the abundance of algae.

Are Diadema impacts related to other issues that affect coral reefs?

Yes, Diadema is often linked to other issues that affect the health of local coral reefs. To better understand how Diadema populations are related to but different from other issues, refer to this flowchart: Flowchart link

How can we solve this problem?
By addressing the problems of overfishing and nutrient pollution, we can help to prevent populations of Diadema from growing to sizes that local reefs cannot sustain.

For more information about the issues that are related to Diadema, click on the following links:

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