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

Morten Foldager Pedersen, Camilla With Fagerli, Kjell Magnus Norderhaug, Hartvig Christie, Stein Fredriksen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In central Norway, populations of the green sea urchin Strongylocentrotus droebachiensis 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 populations are collapsing confirmed predation by some of the predators tested in laboratory experiments. 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.
Original languageEnglish
JournalMarine Ecology - Progress Series
Volume502
Pages (from-to)207-218
ISSN0171-8630
DOIs
Publication statusPublished - 15 Apr 2014

Keywords

  • Predator
  • Cancer pagurus
  • Kelp recovery
  • Laminaria hyperborea
  • Barren ground

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