. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 700 6 A C 1 Zl - DA C DA C DA C DA —'—Z2—'—Z3—•—Z4- C -Z5- DA C -Mgl — 300 Molt stages L. stages Days Figure 2. Salinity tolerance in zoeae 1-5 and megalopae of Cancer at 15°C. Variations in LS 50 in %o and mosm • kg"' according to larval and molt stages and to days of development, in high and low salinities (upper and lower traces). Each point represents the mean value of at least two determinations from 10 animals, with 95% confidence interval. Closed triangles: 24 h LS 50. Closed circles: 48 h LS 50; open
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 700 6 A C 1 Zl - DA C DA C DA C DA —'—Z2—'—Z3—•—Z4- C -Z5- DA C -Mgl — 300 Molt stages L. stages Days Figure 2. Salinity tolerance in zoeae 1-5 and megalopae of Cancer at 15°C. Variations in LS 50 in %o and mosm • kg"' according to larval and molt stages and to days of development, in high and low salinities (upper and lower traces). Each point represents the mean value of at least two determinations from 10 animals, with 95% confidence interval. Closed triangles: 24 h LS 50. Closed circles: 48 h LS 50; open circles: 96 h LS 50. some instances (early zoea 1 and zoea 2), the 24 LS 50 was about 300 mosm • kg"' (10%o), the 96 h LS 50 reaching about 740 mosm • kg ' (25%). In high salinities, the 48 h LS 50 varied around 1420 ± 60 mosm • kg"' (^48 ± 2%o); 24 h and 96 h LS 50s were respectively higher and lower (Fig. 3). Osmoregulation Adaptation time. The time of adaptation after a change in the environmental salinity was evaluated in stage C zoeae 1 and 5 and in adults of C. irroratus. After a rapid transfer from seawater at 920 mosm • kg"1 (31%o) to a dilute medium of 500 mosm-kg ' (17%o), the he- molymph osmotic pressure stabilized within 1 to 2 h in zoeae 1 and 5. In adults transferred from seawater to a dilute medium of 677 mosm-kg"' (23%o), the corre- sponding time was 24 h (Fig. 4). The time of osmotic adaptation to concentrated media was not tested; in other species, it was shorter than the time of adaptation to dilute media (Charmantier ct ai. 1988). In all subsequent ex- periments and in both species, we kept the young stages 6-24 h and the adults 3-4 days in each medium before sampling. Osmoregulation. Adults of C. irroratus and C. bo- realis were almost osmoconformers in high salinities and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
