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Sea urchin population explosion in southern california coastal waters.

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).