. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 WARREN J. GROSS AND RONALD L. CAPEN frequent and no time permitted for Mg++ accumulation. Such a model would explain the high concentration of urine Mg++ for crabs immersed in 158% Mg++-free sea water and low Mg++ concentration in urine of crabs immersed in 50% sea water containing high Mg++. This would also explain the fluctuations in urine Mg*+ shown in Figure 2. That is, low Mg++ concentrations would follow bladder evacua- tion and high Mg++ concentrations would precede evacuation. 2501 225- 200- 175- o u + o> 0) 1
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 WARREN J. GROSS AND RONALD L. CAPEN frequent and no time permitted for Mg++ accumulation. Such a model would explain the high concentration of urine Mg++ for crabs immersed in 158% Mg++-free sea water and low Mg++ concentration in urine of crabs immersed in 50% sea water containing high Mg++. This would also explain the fluctuations in urine Mg*+ shown in Figure 2. That is, low Mg++ concentrations would follow bladder evacua- tion and high Mg++ concentrations would precede evacuation. 2501 225- 200- 175- o u + o> 0) 125- 100- 75- 50-. 'A 0 234 Time in Days FIGURE 2. Fluctuations in the concentration of urine Mg++ + Ca++ of individual crabs immersed in 100% sea water. Each symbol connected by line represents history of individual crab. In order to test this model, one of the paired bladders of a crab immersed in 100% sea water was evacuated; the crab was then reimmersed in 100% sea water and after a given period, urine from the same bladder was sampled for Mg++ analysis. Thus, for 17 crabs reimmersed 2-24 hours, the mean Mg++ concentration was 69 mM/l. (, 55) and for 16 crabs reimmersed 48-96 hours, the mean Mg++ concentration was 165 mM/l. (, 99), the two means being significantly. 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 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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