. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BETYVKHX SCA'l TKU1 X( i LAYKK AND EUPHAUSIACEA 189 I < I i- Q. UJ O. 50-1 i oo - 150- 200- 250- 300- 350 TIME (FOUR-MINUTE INTERVALS) i FIGURE 7. Bathygram showing scattering layer (160 to 190 fathoms) interrupted by submarine peak. Atlantis cruise 156, 4 June, 1949: 38°11'N., 73°'\V. euphausids such as Meganyctiphanes norvegica, Nyctiphanes conchi, etc. which lie on, or close to, the bottom in the daytime. There are also Mysids with similar habits which may be very abundant in some inshore waters. Figure 8
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BETYVKHX SCA'l TKU1 X( i LAYKK AND EUPHAUSIACEA 189 I < I i- Q. UJ O. 50-1 i oo - 150- 200- 250- 300- 350 TIME (FOUR-MINUTE INTERVALS) i FIGURE 7. Bathygram showing scattering layer (160 to 190 fathoms) interrupted by submarine peak. Atlantis cruise 156, 4 June, 1949: 38°11'N., 73°'\V. euphausids such as Meganyctiphanes norvegica, Nyctiphanes conchi, etc. which lie on, or close to, the bottom in the daytime. There are also Mysids with similar habits which may be very abundant in some inshore waters. Figure 8, which was made in water 100 fathoms deep near Miami, Florida, apparently shows such a form leaving the bottom about 40 minutes before sunset and reaching the surface just after sun- set. It also shows clearly the phenomenon of downward diffusion after dark, and it should be noted that there was no moon on that occasion. Figure 9 shows a morn- ing descent onto the bottom which, in this case, is at 200-250 fathoms. Diurnal migration of the scattering layer and of plankton. The diurnal migration of the scattering layer is one of its most striking characteristics, and one which makes it practically certain that the source of the effect is an animal population. Discus- SUNSET. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
