. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 180 MIRIAM F. BENNETT the first three groups these peaks were between 4 and 5 , 3 and 6 , and 2 and 4 , respectively. The morning maximum in group 4 did not occur until 8 although the morning low occurred earlier, , between 2 and 6 , than in the other groups. The minor peak of the morning occurred about 12 hours before the diurnal maximum in all the groups, except group 4. C. The tidal rhythms The tidal rhythms of activity, analyzed as described earlier, are illustrated in Figure 4. Two periods of lo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 180 MIRIAM F. BENNETT the first three groups these peaks were between 4 and 5 , 3 and 6 , and 2 and 4 , respectively. The morning maximum in group 4 did not occur until 8 although the morning low occurred earlier, , between 2 and 6 , than in the other groups. The minor peak of the morning occurred about 12 hours before the diurnal maximum in all the groups, except group 4. C. The tidal rhythms The tidal rhythms of activity, analyzed as described earlier, are illustrated in Figure 4. Two periods of lower activity are evident in each of these curves. These two periods of each curve are about 12 hours apart, thereby approximately reflecting the normal frequencies of the tides of the Atlantic coast. Also to be noted is the fact that the low points of the curve for group 4 occur near the time of low tides in the area of collection. This was the only group for which correlations could be made between actual tidal events and phases of the activity cycles. Since in rendering the diurnal cycles random in order to ascertain the tidal cycles, the successive tidal cycles were brought into phase with the tidal cycle of June 17, 1953, tidal conditions on this day are the ones which should be correlated with the resulting tidal curve. When the points were moved so that the first minimum came to lie between hours 6 and 7, the indicated times of the low tides were moved correspondingly. £40 O or 030 L_ O £20 a: LJ o_. T 1 1 I I I 8 12 16 HOU RS 20 i. 4. The tidal rhythms of activity for the four groups of animals that were studied under constant conditions. Group 1 (open circles with solid lines), group 2 (black circles with solid lines), group 3 (black and open circles with solid lines), and group 4 (open circles with broken lines). Note that the two periods of low activity for group 4 were near the times of low tide as indicated by the Please note that these images are extract
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
