. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. o> J* E o E D •O a. Z3 300 500 700 900 1100 1300 Medium (;1) Figure 7. Variations in the difference between the osmotic pressures of hemolymph and medium according to the osmotic pressure of the medium in zoeae 1-3 of Cancer borealis at I5°C. Each point represents the mean value of determinations from 10 animals with 95% confidence interval. O O: post-molt; • •: stage C; A - - A: premolt. realis, are hyper-osmoconformers or weak regulators, an exception being the larvae of Macrobrachium petersi (Read, 1984), w
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. o> J* E o E D •O a. Z3 300 500 700 900 1100 1300 Medium (;1) Figure 7. Variations in the difference between the osmotic pressures of hemolymph and medium according to the osmotic pressure of the medium in zoeae 1-3 of Cancer borealis at I5°C. Each point represents the mean value of determinations from 10 animals with 95% confidence interval. O O: post-molt; • •: stage C; A - - A: premolt. realis, are hyper-osmoconformers or weak regulators, an exception being the larvae of Macrobrachium petersi (Read, 1984), which are confronted with very low salinities in their natural environment and which can efficiently regulate the osmotic concentration of their hemolymph. During or after the larval phase, different patterns of on- togeny of osmoregulation have been described, which we proposed to separate into three groups (Charmantier et al., 1988). In one group of species, osmoregulation varies little with developmental stage; the adults of these species are often weak regulators or osmoconformers, like He- patus epheliticus and Libinia emarginuta (Kalber, 1970). In M. petersi (Read, 1984), which lives in variable salinities due to its migration, the adult type of regulation is estab- lished as early as the first larval stage. In a third group of species, which includes Uca subcylindrica (Rabalais and Cameron, 1985), Homarus americanus, Penaeusjapon- icus (Charmantier et at., \988), and Cancer irroratus (this study), metamorphosis marks the appearance of the adult type of regulation. In other species that do not still fit in those three categories, in which "no clear trend toward development of adult osmoregulatory patterns toward the end of larval life" was found (Foskett, 1977), this could be due to the lack of information about the osmoregu- latory capacity of early post-metamorphic stages. For ex- ample, in Sesarmu reticulatum studied by Foskett, 1977, zoeae and megalopa
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
