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" ... Rootsaert’s experiments include weekly visits to the same urchin barrens, areas where urchins have eaten all the kelp, to remove urchins and determine at what point a kelp forest can re-establish itself. “In our experiments we found that we can suppress urchin density in a barren over time, and the real issue then was having successful kelp recruitment to our cleared reefs,” Rootsaert explained, “What we didn’t predict is that even when the purple urchins are gone, the red urchins are preventing kelp regrowth as well”. While removing urchins is important, the ability for new kelp to grow in their place is just as significant. Red urchins will also feed on kelp, however the increase in their population has not been nearly as explosive as that of the purple urchins. ... "
" ... The urchins that are covering the west coast are not only pervasive, they’re also starving. The collapse of kelp forests means that the food the urchins are after, is no longer available to them. Urchins found in urchin barrens are empty shells, but they continue to live on. They can live in this starved state for quite some time, and in the process they reproduce, prevent other species from occupying the space, and prevent new kelp from growing. ... "