D

1. Davidson Current, 725

2. Dead water, 587

3. Deeps, 20

   1. of the oceans, 29

4. Deep-sea anchoring, 361, 362

5. Deep-sea benthos, 805–810

   1. characteristics, 807

   2. early discoveries, 805

   3. food of, 808

   4. horizontal distribution, 810

6. Deep-sea environmental system, 275–276

7. Deep water (see also under specific geographic regions):

   1. circulation, 745–755

   2. formation, 138, 139

8. Denmark Strait, flow through, 652–655

9. Density, 56, 57

   1. computation, 57

   2. direct determinations, 53

   3. general distribution, 137–140

   4. maximum, 66, 68

10. Density currents, 41

11. Deposition of sediments (see Sedimentation), 960

12. Depth of frictional resistance, 396, 493

13. “Desert quartz” in sediments, 955

14. Detritus feeders and scavengers, 892–895

15. Development of animals (see also Life cycles):

    1. direct, 318

    2. indirect, 318

    3. of deep-sea animals, 318

16. Diatomaceous ooze, relation of to organic production, 942

17. Diatom ooze (see Pelagic sediments)

18. Diatoms:

    1. as primary producers, 287, 296

    2. auxospores, 298, 763

    3. control by grazing, 771–772, 901–902

    4. geographical types, 791, 793

    5. methods of flotation, 764–765

    6. number in the open sea, 763

    7. number of important planktonic species, 762

    8. nutrient absorption, 782–783

    9. nutrient requirement, 768, 782–783

    10. on whales, 299, 881

    11. “persistent” culture of, 780

    12. reproduction, 297–299

    13. resting spores, 299, 762–763

    14. sinking, 772, 781, 893

        1. importance of viscosity, 794

    15. structure, 295–297

    16. systrophe in, 779, 781

    17. temperature requirements, 770, 792–794

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    ― 1066 ―

    18. tychopelagic forms in the plankton, 762

19. Diffusion (see also Eddy diffusivity), 69

20. Dimensions used in mechanics, 400–402

21. Dinoflagellates:

    1. distribution, 762

    2. methods of flotation, 765–766

    3. number of important species in the plankton, 762

    4. nutritional requirements, 299, 385

    5. rate of production, 790, 930

    6. reproduction, 300

    7. structure, 299–300

    8. systematic position, 304

    9. temperature requirements, 385, 762

22. Diurnal migrations, 836–839

23. Divergence, 420

    1. caused by wind, 500–503

    2. near Antarctic continent, 620

    3. near the equator, 635, 711

    4. regions of, 140

    5. vertical motion derived from, 425

24. Dolomite, 952, 998, 1027

25. Dredge, 374, 375

26. Drift bottles, 364, 365

27. Drift of plants, 791–792

28. Dynamic computations, 392, 408–411

    1. example, 4

29. Dynamic equilibrium, principle of, 160–163

30. Dynamic meter, 392, 403