. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 384 MASAYUKI SAIGUSA O o 1976 • o • o 11 27 days 11 i— -27 days jn 28 days 30 days—-—n 27 days — 1111111111111111111111111111 10 20 30 10 * 20 30 10 A 20 * 30 *10_ 20 Jun Jul A A Aug. C' FIGURE 10. Construction of a semilunar larval release rhythm observed at the Izu peninsula in 1976. Results in the laboratory apply to the field data. A, the first egg production; A', the first larval release; B, the second egg production; B', the second larval release; C, the third egg production; C', the third larval release. For further e
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 384 MASAYUKI SAIGUSA O o 1976 • o • o 11 27 days 11 i— -27 days jn 28 days 30 days—-—n 27 days — 1111111111111111111111111111 10 20 30 10 * 20 30 10 A 20 * 30 *10_ 20 Jun Jul A A Aug. C' FIGURE 10. Construction of a semilunar larval release rhythm observed at the Izu peninsula in 1976. Results in the laboratory apply to the field data. A, the first egg production; A', the first larval release; B, the second egg production; B', the second larval release; C, the third egg production; C', the third larval release. For further explanation, see text. associated with high water around full and new moons disperse larvae most effectively in the sea (Wheeler, 1978), and this provides the best opportunity for megalops to be transported to substrates suitable for adults (Christy, 1978; Zucker, 1978). According to Vernberg and Vernberg (1975), fiddler crab larvae have little tolerance for reduced salinity, though species and seasonal differences exist. The tolerance of S. haemalocheir and S. intermedium zoeae for fresh water is very low, though they are much more resistant of low salinity than Uca zoeae. These facts suggest that zoeae released into the river under extremely low salinity conditions might perish. Salinity at Kasaoka rapidly increased with rising tide, becoming a maximum for a period of six hours when the water was flowing. A comparison of Figure 4 with Figures f and B suggests that S. haematocheir zoeae are released into the tiver when the salinity is most favorable: on 20 July (Fig. 5A) and 1 September (Fig. 5B), larvae, released just after sunset, have been exposed to extremely low. 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 (W
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
