. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 420 AUDREY M. STUTZ Z < o X O a: Ll_ o. — NADIR ZENITH NADIR LUNAR DAY FiGi'RK 3. Mean lunar-day cycle for all 5 gerbils—A, B, C, D, and E—in Values are three-hour sliding means. of activity is during- the lunar day, falling to a low at lunar upper transit, with a secondary minimum at lunar lower transit. Figures 2C and 2D are almost perfect mirror images of one another, with gerbil 1) showing maximum activity when the moon is above the horizon, rising to a peak close to upper transit. A second peak of activity
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 420 AUDREY M. STUTZ Z < o X O a: Ll_ o. — NADIR ZENITH NADIR LUNAR DAY FiGi'RK 3. Mean lunar-day cycle for all 5 gerbils—A, B, C, D, and E—in Values are three-hour sliding means. of activity is during- the lunar day, falling to a low at lunar upper transit, with a secondary minimum at lunar lower transit. Figures 2C and 2D are almost perfect mirror images of one another, with gerbil 1) showing maximum activity when the moon is above the horizon, rising to a peak close to upper transit. A second peak of activity is present at lunar lower transit. Minima occur around times of moonrise and moonset. Figure 2E. a unimodal curve, shows maximum gerbil activity two hours before the setting of the moon and minmum activity at moonrise. The mean lunar-day cycles for all gerbils seem to have times of maxima and minima locked to the approximate hours of moonrise, moonset, lunar upper and lower transits. There is also an apparent tendency for the cycles to undergo ma- jor inversions of one another, and it appears that the cycles are all interrelated with one another in terms of degrees of inversion. These phenomena were also found to be true for those lunar-clay activity cycles disclosed in gerbils in 12-12 LD. Figure 3, the mean lunar-day cycle for gerbils A-E, shows a broad maximum extending over the time of moonset. A secondary, and very low amplitude maxi- mum, is present two hours after moonrise. The major minimum of this cycle is at the time of the rising of the moon. Expressed as percentages of the mean hourly average, the ranges of the lunar- day cycles in Figure 2 are \l%, 39%, 46%, 29% and 47% for gerbils A, B. 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. );
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
