. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. Oceanography. GENERAL BIOLOGY 705 is peculiar in so far that southern species of molluscs, for instance, occur as isolated specimens even far north in the Norwegian Sea, while northern species have a sharp southern limit (see Chapter VII.). Vast numbers of small pelagic organisms are introduced into the Norwegian Sea from the Atlantic. As the water-masses of a current are carried along, the. Fig. 508.—Currents
. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. Oceanography. GENERAL BIOLOGY 705 is peculiar in so far that southern species of molluscs, for instance, occur as isolated specimens even far north in the Norwegian Sea, while northern species have a sharp southern limit (see Chapter VII.). Vast numbers of small pelagic organisms are introduced into the Norwegian Sea from the Atlantic. As the water-masses of a current are carried along, the. Fig. 508.—Currents of the North Atlantic. (From Schott's " Valdivia" Report and! Helland-Hansen and Nansen's memoir on The Norzvegian Sea.) conditions of existence for certain animals change, and as a consequence the fauna gradually changes in character. This change of fauna from place to place in the same expanse of water has always presented interesting problems in oceanic research. Sir John Murray writes upon this point as follows : I "Where cold and warm currents meet at the surface of the Effect of large ocean, there is a rise of temperature for the animals of the cold fange of. c ' temperature current, and a fall of temperature for the animals of the warm in the surface . current, which results in a plentiful destruction of organisms. 2 z Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Murray, John, Sir, 1841-1914; Hjort, Johan, 1869-. London Macmillan
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