. 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. 724 DEPTHS OF THE OCEAN The abundant plankton peculiar to boreal waters in summer (August) apparently accumulates in those layers where the highest specific gravity occurs, the volume thence decreasing in the deep uniform layers below 500 metres. A series of hauls taken close to the Wyville Thomson Ridge in the southern part of the Norwegian Sea at Station 113 gave the following results :— 100 to
. 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. 724 DEPTHS OF THE OCEAN The abundant plankton peculiar to boreal waters in summer (August) apparently accumulates in those layers where the highest specific gravity occurs, the volume thence decreasing in the deep uniform layers below 500 metres. A series of hauls taken close to the Wyville Thomson Ridge in the southern part of the Norwegian Sea at Station 113 gave the following results :— 100 to o metres gave 10 containing ... species of Crustaceans. 300 to 100 „ 5 „ 21 500 to 300 „ 12 „ 18 1000 to 500 12 140 11 & 6t=, .X .i 4 .5 .6 .7 3 9% .1 X -3 4 .5 £, .7 Jg, t°" 12.° I/0 10° 9" 0° 7° 6° 5° 4° 6° 2° 1° 500 £ 1000 l5oo 2ooo. Fig. 518.—Curves of Temperature (t°) and Specific Gravity {at), Station 80. (Off Newfoundland Bank.) The curve for specific gravity shows here (see Fig. 519) a rapid rise down to 100 metres, then a slow rise down to about 300 metres, and finally a rapid rise down to about 600 or 700 metres. A pronounced minimum in the volume of Crustacea occurs between 300 and 100 metres, and an enormous increase is found between 1000 and 500 metres, where the volume is fifty times larger than the volume in the surface layers of the Sargasso Sea. In my opinion these facts prove the correctness of the hypothesis that minute pelagic Crustacea (and consequently nourishment suitable for larger organisms) tend to accumulate at those depths where a pronounced rise in the specific gravity. 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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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
