WhyReef - Threats
Too many long-spine sea urchins are bad for coral reefs, but too few of them can be a bad thing, too! They love to eat algae, and algae and corals compete for space in the reef. By eating the algae they make more room for the coral to grow. But if they eat too much algae, then there is no food left for the other animals that eat algae.
- Encyclopedia of Life. World Wide Web electronic publication. www.eol.org, version (08/2009). http://www.eol.org
- Shedd Aquarium. World Wide Web electronic publication. www.sheddaquarium.org, version (08/2009). http://www.sheddaquarium.org/sea/fact_sheets.cfm?id=69
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