. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TIDAL TIMING IN EGG HATCHING RHYTHM 373. FIGURE 2. S. haematocheir female behavior following larval release. On the final day of embryonic development, egg laden females appear on the riverside to release their clutches at the water's edge. Holding onto stones or rocks, the females vigorously vibrate their abdomens, causing the egg membranes to break, and newly hatched zoeae to emerge. might be worth while to look for adaptive meaning of such behavior as biological rhythm in Uca and Sesarma spp. Based on field observations o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TIDAL TIMING IN EGG HATCHING RHYTHM 373. FIGURE 2. S. haematocheir female behavior following larval release. On the final day of embryonic development, egg laden females appear on the riverside to release their clutches at the water's edge. Holding onto stones or rocks, the females vigorously vibrate their abdomens, causing the egg membranes to break, and newly hatched zoeae to emerge. might be worth while to look for adaptive meaning of such behavior as biological rhythm in Uca and Sesarma spp. Based on field observations of time of larval release by S. haematocheir, Sesarma intermedium, and Sesarma dehaani and experiments on the tolerance of zoeae to fresh water, concluded that the semilunar rhythm of larval release gives larvae the best chance for survival (Saigusa, 1981). The most important point supporting this conclusion is that larval release is concentrated within a few hours after high water occurring about dusk. This poses a problem of tidal synchrony. On coasts with semidiurnal tides, the times of high and low waters on days of full and new moons have occurred at nearly the same time of day for years, but differed depending on the seashore location. (For example, on coasts of the Izu peninsula, the time is around sunrise and sunset for spring tides, but from five to six hours later in the Inland Sea.) Thus the question arises as to whether timing of larval release coincides with local tidal cycles. The two questions above may be condensed into the following problem: is the time of day of larval release correlated with tidal cycles? To solve this problem,. 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. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report
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