Archive image from page 780 of The depths of the ocean;. 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 depthsofoceange00murr Year: 1912 x GENERAL BIOLOGY 725 and viscosity occurs. Especially convincing is the fact that although this rise occurs at very different depths in the three localities mentioned, the increase in the volume of small organisms captured in the nets in every case coincides with the rise in the specific gravity. An important point for our
Archive image from page 780 of The depths of the ocean;. 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 depthsofoceange00murr Year: 1912 x GENERAL BIOLOGY 725 and viscosity occurs. Especially convincing is the fact that although this rise occurs at very different depths in the three localities mentioned, the increase in the volume of small organisms captured in the nets in every case coincides with the rise in the specific gravity. An important point for our conception of the animal life of the Atlantic is that the greatest volume of pelagic Crustacea has never been found in the upper 100 or 200 metres, where the production of minute plants takes place ; the great majority of small pelagic Crustacea live everywhere in the deeper inter- mediate layers. The examples cited above show further that the volume of organisms captured differs greatly in correspond- ing depths at the different stations, being strikingly small in the Sargasso Sea com- pared with the boreal waters at. 9Z7o , z 3 5 6 ? s .9 &» / off Newfoundland and the f /<-//-'- ° g r §1 r r f 0°/c ' southern part of the Nor- wegian Sea. All these investigations indicate the quantity of J 500 organisms present only at | the moment of examination. We cannot, from our results, conclude that similar condi- tions always prevail, nor that Fig. 519.—Curves of Temperature (f) and the aggregate quantities of Specific Gravity (<rt), Station 113. r J • 1 i-ii- 1 (North of Wyville Thomson Ridge.) lood-animals which live and die during the year are proportionate to the quantities found at a given moment in the different localities. The quantity of food-animals changes first according to seasons and second according to the intensity of production, but very little is known about these two important factors. Only in restricted areas of the coastal waters have attempt
Size: 1440px × 1389px
Photo credit: © Actep Burstov / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1900, 1910, 1912, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, illustration, image, london_macmillan, murray_john_sir_1841_1914, oceanography, page, picture, print, reference, vintage
