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underwater caverns, wrecks, coral, sponges, and other marine life. Couper, A. D. (ed.) (1989). Development and Social Change in the Pacific Islands. London: Routledge. ISBN 0-415-00917-0. The second driver of productivity in the Bering Sea is seasonal sea ice that, in part, triggers the spring phytoplankton bloom. Seasonal melting of sea,
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from the seabed in mechanical grabs. However, the groupings of animals present depend to a large extent on whether the seabed is composed of rock, boulders, gravel, sand, mud or even peat. In the soft sediments seven types of community have been provisionally identified, variously dominated by brittle-stars, sea urchins, worms, mussels,,
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