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: In central Norway, populations of the green sea urchinStrongylocentrotus droe-bachiensisare collapsing, but the factors controlling its population density have not yet beenelucidated. Through field sampling, we identified several sea urchin predators and investigatedtheir predation rates on recently settledS. droebachiensisin laboratory experiments. Tetheringexperiments in kelp forest and on barren ground study sites in the area where sea urchin popula-tions are collapsing confirmed predation by some of the predators tested in laboratory experi-ments. The edible crabCancer paguruswas the most efficient sea urchin predator, and it wasmore abundant at kelp forest sites than on barren grounds. Stocks ofC. pagurushave increaseddramatically in central Norway since the 1990s, and predation byC. pagurusmay contribute tothe decline in sea urchin densities, allowing kelp recovery and conferring resilience of the newkelp forest state

Predators of the destructive sea urchin Strongylocentrotus droebachiensis on the Norwegian coast