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

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

ISBN-10: 0120261103

ISBN-13: 9780120261109

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Sir James Clark Ross (1839-41) with the Erebus and Terror especially equipped for magnetic observations, circumnavigated the Antarctic Continent. His ships broke through the pack ice of the Ross Sea, thus opening a gate through which many subsequent expeditions were to work their way south to the Ross Sea and the Continent. Ross made many geographical discoveries and confirmed the positions of many other features. Thanks t o the presence on board of the botanist, J. D. Hooker, this expedition laid the major framework for all subsequent work on southern floras, particularly of the Subantarctic Islands.

The main contributing sponge genera are Rosella, Tetilla and Cinachyra. A very similar type of formation occurs in parts of McMurdo Sound (Bullivant, 1967). Farther north from the Antarctic Continent Koltun found a steady fall off in the number of spicules, ranging between 10 to 100 spicules/cm2. I n the southern part of the Indian Ocean the general figure is less than 10/cm2,although this figure rises considerably around the Subantarctic Islands and around shallow water banks. Sponges are only extremely abundant in the Antarctic down to between 600 and 600 m, the limit being usually fairly abrupt.

One problem in writing a consecutive account of investigations into the Antarctic fauna arises from the fact that dates of publication of scientific results may bear little relation to the date of the expedition. The earlier expeditions did not amass very large collections and their biological reports running to a single volume or at most a very few volumes could be brought out quickly after the close of the expedition. Those expeditions which concentrated upon biological work and which obtained large collections could no longer hope for such rapid publication.

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