. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 382 MASAYUKI SAIGUSA 200 -, IX. -100- -200J FIGURE 9. Correlation of the timing of the Izu population larval release with high water 1-24 September 1976. The value for HW-X was calculated by the same method shown in Figure 6A. Made from data published elsewhere and Figure 8. Broken lines connect the estimated time from sunset to the high water. the Japanese midge C. tsushimensis (Oka and Hashimoto, 1959) and the grunion Leuresthes tennis (Enright, 1975). In addition, timing coinciding with both solar day and tidal cycles in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 382 MASAYUKI SAIGUSA 200 -, IX. -100- -200J FIGURE 9. Correlation of the timing of the Izu population larval release with high water 1-24 September 1976. The value for HW-X was calculated by the same method shown in Figure 6A. Made from data published elsewhere and Figure 8. Broken lines connect the estimated time from sunset to the high water. the Japanese midge C. tsushimensis (Oka and Hashimoto, 1959) and the grunion Leuresthes tennis (Enright, 1975). In addition, timing coinciding with both solar day and tidal cycles in the Sesarma larval release rhythm is reported here. The combined effects of solar day and tidal components have been described for locomotor activity rhythms of several species of crabs, Carcinus (Naylor, 1958), Sesarma (Palmer, 1967) and Uca (Barnwell, 1966; Honegger, 1976; Webb, 1976). Whereas locomotor activity usually shows a bimodal tidal component, most reproductive activity seems to be correlated with either semidiurnal tide. The tidal component was much stronger in the Kasaoka (Figs. 5A, B) than in the Izu population pattern (Fig. 8). This suggests that in the Izu population pattern, the tidal component diminishes. This may be transitional, going from a combined solar day and tidal pattern to a completely daily rhythm. Two possibilities for the difference in both population patterns are: a direct response to a certain difference in tidal conditions surrounding each population, and population-specific rhythm. Although the study site at the Izu Peninsula was situated at a point near the limit of where tidal amplitude affected the water level, the site at Kasaoka was located only 100 m from the sea. Various influences pro- duced by the dal cycle would be considerably weakened at a site (Izu) km from the seacoast. (For example, tidally correlated vibration would be extremely lessened; and, tida amplitude might effect the water level only near spring tides.) Therefo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
