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A variety of biotic factors, including competition, predation, and disease, all play important roles in regulating sea urchin populations. Abiotic factors have an impact on sea urchin populations at various stages of their life cycle.
Sea urchinsare spiny, globular echinoderms in the Echinoidea class. There are approximately 950 species of sea urchins that live on every ocean's seabed and inhabit every depth zone from the intertidal seashore down to 5,000 meters (16,000 ft; 2,700 fathoms).
Sea urchins' spherical, hard shells (tests) are round and spiny, ranging in diameter from 3 to 10 cm (1 to 4 in). Sea urchins crawl slowly with tube feet and propel themselves with their spines. Although algae are the primary source of nutrition, sea urchins also consume slow-moving (sessile) animals. Fish, starfish, crabs, and marine mammals are among the predators that eat sea urchins. Sea urchins are also eaten, particularly in Japan.
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