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There is no kelp left at the Cabrillo Mole in Catalina either.
It has to do with the current higher temperature of the water.
Kelp grows very fast, so even if the tops were gone, it could grow back.
The warmer temp must weaken the hold fast that kelp uses to stick itself to the rocks.
Also the sea urchins can devastate a kelp forest. Lobsters keep them in check.
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