Abstract

The alleged population explosion of coral-eating sea stars (Acanthaster planci) in the west tropical Pacific (1) may be comparable to the apparent population explosion of herbivorous sea urchins (Strongylocentrotus franciscanus and S. purpuratus) along the coast of southern California. Many luxuriant kelp beds, supporting a rich association of other organisms, have all but disappeared during the past few decades, and in the place of the holdluxuriant holdfasts are barren areas supporting extremely dense populations of the urchins (2).

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