. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RHYTHMIC ACTIVITY IN VENUS 181 800 </) 600 LJ h- 400 LJ Q. O LJ 200-. 3 5 DECEMBER 7 II 13 15 17 19 FIGURE 5. The long-term cycles of activity for the group of clams that was exposed to an illumination of 100 ft. c. by night and darkness by day for five consecutive days (broken lines) and for its control group that was maintained under constant laboratory conditions (solid lines). The particular method used in determining the general character of the tidal cycle does not permit demonstrating precisely the expected
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RHYTHMIC ACTIVITY IN VENUS 181 800 </) 600 LJ h- 400 LJ Q. O LJ 200-. 3 5 DECEMBER 7 II 13 15 17 19 FIGURE 5. The long-term cycles of activity for the group of clams that was exposed to an illumination of 100 ft. c. by night and darkness by day for five consecutive days (broken lines) and for its control group that was maintained under constant laboratory conditions (solid lines). The particular method used in determining the general character of the tidal cycle does not permit demonstrating precisely the expected character of the tidal cycles. The curve for group 1 does show two minima occurring 13 hours apart while that for group 2 has low points 10 hours apart, group 3 hours apart, and group 4 hours apart. The average obtained, therefore, was hours for the four series. The amplitude of the four cycles also differs from one to another. That for group 1 has the greatest amplitude, an increase of 108% from lows to highs, while the other three increased only 27% to 32% from low points to high ones. Another interesting point evident in the curves of the tidal cycles is that in all of them one of the two periods of increased activity shows two peaks of relatively high activity separated by two to three hours of relatively low activity. The shapes of the tidal curves for groups 1, 2, and 3 are similar to that illus- trated for group 4 for which correlations with actual tidal phases could be made. Therefore, it would be reasonable to predict tidal events in the habitats of groups 1, 2, and 3, since the phases of the persistent tidal cycle probably always bear corre- sponding relationships to the times of tides in the native 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 Labor
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
