. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 JOHN C CORXELL Pugetti Blood Na+ Normal Occluded N. .105 100 95 90 85 80 m m O O 2 O O O z n m > 75 5 10 15 20 HOURS IN 80°/o SW FIGURE 2. Changes in the blood concentration of sodium in normal and nephropore- occluded specimens of Puycttia producta transferred from 100 to 80% sea water. Normal (average weight, 104 g) and nephropore-occluded (89 g) crabs are indicated by open circles and squares, respectively. Note that during these experiments, some nephropore-occluded crabs died and that the concentration of the medi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 JOHN C CORXELL Pugetti Blood Na+ Normal Occluded N. .105 100 95 90 85 80 m m O O 2 O O O z n m > 75 5 10 15 20 HOURS IN 80°/o SW FIGURE 2. Changes in the blood concentration of sodium in normal and nephropore- occluded specimens of Puycttia producta transferred from 100 to 80% sea water. Normal (average weight, 104 g) and nephropore-occluded (89 g) crabs are indicated by open circles and squares, respectively. Note that during these experiments, some nephropore-occluded crabs died and that the concentration of the medium changed from to sea water. [((Wt/Wo) -- l)(l/t)| versus t, where t is time, and \Vt and \V0 are the weights at times t and 0, respectively. In the case of normal crabs, Wt was some- times less than W0 and therefore the above logarithmic term was not defined. These data were coded by adding to the term \Vt/W0 and regressed against the square root of time, in order to eliminate the significant deviations from linear regression which coding had introduced. In the case of nephropore-occluded crabs, it was unnecessary to code the data. Analysis of covariance indicates that the intercepts of the regressions for normal and nephropore-occluded specimens of Pugettia are significantly greater than those for normal (P < ) and nephro- pore-occluded (P < ) specimens of Libinia, respectively. No differences between the slopes in either pair of regressions were found. The antiloge of the intercept is equal to C in the above equation. At time 0 the first derivative is C (even after the data have been coded). Thus, the initial rate of weight gain is greater in specimens of Pugettia, and since this is an indication of the rate of water influx, it appears that Pugettia is more permeable to water than Libinia (see Cornell, 1979b). In Pugettia, the urine production rate increased from about 6 to 30% bw/day during the first hour after transfer to 8Qc/c S\Y. After t
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