. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 134 M. SAIGUSA 12 C Time of day 40 60- 80 100- 120- 2nd moonlight 3rd moonlight 4th moonlight -179(0 69) >-2 57(119) } -127(0 74) ) () â 156(095) Figure 6(A). Time of day oflarval release by the Seto population monitored under an artificial moonlight cycle. Moonlight is shown by the horizontal bars in the dark period of the 24-h LD cycle. Slope and variance of the activity pattern are shown on the right side of the corre- sponding data. guish which is the real moonrise or moonset. This study certainly demonstrate
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 134 M. SAIGUSA 12 C Time of day 40 60- 80 100- 120- 2nd moonlight 3rd moonlight 4th moonlight -179(0 69) >-2 57(119) } -127(0 74) ) () â 156(095) Figure 6(A). Time of day oflarval release by the Seto population monitored under an artificial moonlight cycle. Moonlight is shown by the horizontal bars in the dark period of the 24-h LD cycle. Slope and variance of the activity pattern are shown on the right side of the corre- sponding data. guish which is the real moonrise or moonset. This study certainly demonstrates that even a moonlight illumina- tion for some days around the time of full moon func- tions for entrainment. But it could not determine the es- sential component for the entraining agent involved in moonlight cycles. The pattern of the larval release rhythm of the Shi ma population (Figs. 4, 5A) differs from that of the Seto pop- ulation (Figs. 2, 5B) as follows: (1) tidal component ap- pears in the first half of the night; (2) the population has somewhat strong semilunar timing. Since the same zeit- geber cycles were given to both populations, such a difference in the pattern of the rhythm may be based on the properties specific to each population. The larval re- lease pattern of the Shima population is clearly similar to that of the Izu population (Saigusa, 1985), which sug- gests that the pattern illustrated in Figure 4 is common to populations inhabiting the coast of the Pacific Ocean. Another striking aspect on comparing the pattern of the tidal rhythm between Seto and Shima populations is different phase relations to the artificial moonlight cy- cles. Figure 9 represents times of high tide occurring at the seacoast near the habitats of each population. Ka- saoka is located around the central part of the Seto In- land Sea, so that while the day-night and moonlight cy- cles differ by only 10 min between both areas, times of high tide are h behind those at Shima. Th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
