. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 300- 250 200 200 250 300 350 400 450 500 Medium chloride ion concentration (mmol/L) 550 Figure 2. Hemolymph chloride ion concentration of Cancer magisier as a function of medium chloride ion concentration for 4, megalopa (n = 1-3); A, 1st instar juvenile (n = 2-3); •. 5th instar juvenile (n = 2- 3); • adult (n = 8). Solid symbols, n > 2, standard error bars drawn; open symbols, n < 2, mean. of temperature on the hemolymph sodium ion activity in any of the stages. There is no significant effect of temperature on he- mol
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 300- 250 200 200 250 300 350 400 450 500 Medium chloride ion concentration (mmol/L) 550 Figure 2. Hemolymph chloride ion concentration of Cancer magisier as a function of medium chloride ion concentration for 4, megalopa (n = 1-3); A, 1st instar juvenile (n = 2-3); •. 5th instar juvenile (n = 2- 3); • adult (n = 8). Solid symbols, n > 2, standard error bars drawn; open symbols, n < 2, mean. of temperature on the hemolymph sodium ion activity in any of the stages. There is no significant effect of temperature on he- molymph potassium ion activity (Fig. 4). The megalopa shows no significant change in hemolymph potassium ion activity. The adult, 1st instar juvenile, and 5th instar ju- venile hemolymph potassium ion activities, however, are significantly less in 75% and 50% seawater than in 100% seawater. In contrast to the concentrations of chloride, sodium, and potassium, that of magnesium is strongly hyporegu- lated in adult hemolymph in all salinity treatments (Fig. 5). In 100% seawater the megalopa, 1st instar juvenile, and 5th instar juvenile hemolymph magnesium concen- trations are significantly higher than the adult. As salinity decreases, magnesium concentration in these three stages also decreases until, in 50% seawater, there is no difference in the hemolymph magnesium concentration among all four stages. The only stage in which magnesium regulation shows a significant temperature sensitivity is the 5th instar juvenile in 100% seawater. In 100% seawater the hemolymph calcium ion activities in all four stages are not significantly different from the ambient seawater calcium ion activity (Fig. 6). The he- molymph calcium ion activities of the megalopa and adult do not change significantly with salinity. The 1st instar juvenile and 5th instar juvenile, however, have signifi- cantly lower hemolymph calcium ion activities in 75% and 50% seawater than in 100% seawater. Overall there is
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
