. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RHYTHMIC ACTIVITY IN VENUS 177 an illumination of 2 ft. c. During the three-week period, the temperatures of the two rooms in which the clams were kept were recorded continuously on Taylor ther- mographs, and were seen to fluctuate between 20° C. and 22° C. The records for these animals were analyzed as were those for the clams of the first four groups. However, the average values for three consecutive days were averaged and this average used as the value for the second of the three days, , the figures for De- cember 4,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RHYTHMIC ACTIVITY IN VENUS 177 an illumination of 2 ft. c. During the three-week period, the temperatures of the two rooms in which the clams were kept were recorded continuously on Taylor ther- mographs, and were seen to fluctuate between 20° C. and 22° C. The records for these animals were analyzed as were those for the clams of the first four groups. However, the average values for three consecutive days were averaged and this average used as the value for the second of the three days, , the figures for De- cember 4, 5, and 6 were averaged and the resulting value used as the time open for December 5. Such procedure was used to obtain the relationship illustrated in Figure 5, and was thought to render the comparisons between the experimental and control curves more significant. The form of the average diurnal curve for each group was ascertained by aver- aging the times open or active for each of the 24 daily, one-hour periods of 15 con- secutive days. These 24 values were converted further to the percentage of 60 minutes open or active. All phases of a possible tidal influence are represented in ^ UJ h- 800 600 z UJ Q_ o LJ ^ h- 400 200 GROUP I O GROUP 2 •. I I I J I I I J I 369 FEBRUARY 12 15 18 21 24 27 2 5 MARCH 8 II 14 17 20 FIGURE 1. The long-term cycles of activity for group 1 (open circles) and group 2 (black circles) which were studied in Evanston, 111. For explanation of A, B, and C, see text. each of the values, and are thereby randomized since data for 15 days were used. In the cases in which the particular observational period was longer than 15 days, a 15-day period was arbitrarily selected, usually from the middle of the period. Conversely, the diurnal rhythm was rendered random to reveal the character of the tidal rhythm in the following manner. The values for activity of the 24 daily, one-hour periods for each of 15 successive days were moved backwards at an average rate
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
