. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Time of day 6 12 18 1991 Nov27 Dec 24 Tide height (m) 1 I 0 05 -LWl 25-. Figure 6. Daily timing of emergence of Clunio males from mid-October to the end of December 1991. Symbols are the same as in Figure 4. (Left) In autumn (17 October-27 November). The number of emerged midges drastically increased from October to November (compare Fig. 7g and 7h), so the figure was separated into two panels (horizontal dashed lines) with different vertical scales. The data on emergence in this period are shown in duplicate in Figu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Time of day 6 12 18 1991 Nov27 Dec 24 Tide height (m) 1 I 0 05 -LWl 25-. Figure 6. Daily timing of emergence of Clunio males from mid-October to the end of December 1991. Symbols are the same as in Figure 4. (Left) In autumn (17 October-27 November). The number of emerged midges drastically increased from October to November (compare Fig. 7g and 7h), so the figure was separated into two panels (horizontal dashed lines) with different vertical scales. The data on emergence in this period are shown in duplicate in Figure 9. with the tluctuations of the two low tides (LII7 and L\V2). (Right) From 27 November to 26 December. Vertical scale: 200 midges. uary and February, from morning low tides to afternoon low tides, and a unimodal tidal rhythm in synchrony with afternoon low tides appeared in March. This pattern lasted until early October. In mid-October, the synchrony shifted to the morning low tides. As a result, emergence was ob- served during the day from spring to autumn, at night in early winter, and in both daytime and nighttime in mid- winter. Therefore, we must ask a question about the modulation of the expression of that rhythm: What are the factors that induce the expression of the bimodal pat- tern and that cause one of the two low tides to synchronize the timing? Relations between the tidal patterns ami the phase expression of the tidal rhythm On most Japanese seacoasts fronting the Pacific Ocean, there are two high and two low tides per day, at mean intervals of h; the amplitude of these tides changes with a fortnightly periodicity, resulting in spring and neap tides. But the amplitude of these tides on a given day varies with season. For example, on 16 January (new moon; see Fig. 4B), a low low tide (+ m) occurs at 0500. A high high tide (+ m) is followed after 7 h by this low tide, which is then followed after 6 h by a high low tide (+ m), and further followed a
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
