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Download PDF by Frederick S. Russell, Maurice Yonge (Eds.): Advances in Marine Biology, Vol. 10

By Frederick S. Russell, Maurice Yonge (Eds.)

ISBN-10: 0120261103

ISBN-13: 9780120261109

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Koltun (1968) has shown the degree to which the free siliceous spicules of sponges occur in bottom sediments. From a study of the upper horizons of sediment cores in the Indian Ocean sector of the Southern Ocean he was able to demonstrate that siliceous spicules were extremely common. On the continental shelf and slope of Antarctica and in the adjacent ocean bottoms Koltun found areas containing from 100 to 300 spicules/cm2. On the shelf itself some areas produced more than 300 spicules/cm2. I n these areas silica was found to make up from 50 to 70% of the actual sediment and in places the surface " looks like spicular felt 65 cm thick ".

Thomson and Rennet (1931) recorded one species Euuntipathes plana (Cooper) from off Macquarie Island and Bathyplanes patula Brook from 64"34'S, in 3 109 m. Pasternak (1959) recorded the discovery of further specimens of the cosmopolitan antipatharian Bathypathes patula off the Antarctic continent in depths of 4 636 and 4 200 m. 4.

Stomatopods are lacking completely. On the whole it is at about the level of Orders that occasional gaps appear in Antarctic checklists, although most of the noteworthy gaps are at the family level or slightly higher. Groups of animals which are well represented are those adapted to make use of the great summer bloom of phytoplankton. g. sponges, bryozoa, ascidians, gorgonian corals, hydroids, bivalves, cirripedes, sedentate polychaetes, ophiuroids and crinoids. Many of these are sedentary, anchored to the substrate, some are colonial.

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Advances in Marine Biology, Vol. 10 by Frederick S. Russell, Maurice Yonge (Eds.)

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