. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 56 WARREN J. GROSS tain the body fluids at viable concentrations over a range of osmotic stresses. This could be possible if the animal holds a constant gradient between blood and external medium, although the actual blood concentration alters to permit the constant gradi- ent. Over such a range of stress, then, the constant rate of regulation would be 70 te. u 60 * < w m 8* 50 40 -I < Ul o o o 30 20 10 r. uj O K o 0. ISOTONICITY j 25 5O 75 100 125 150 MEDIUM CONCENTRATION ( % SEA WATER) FIGURE 5. Crabs sustain greater
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 56 WARREN J. GROSS tain the body fluids at viable concentrations over a range of osmotic stresses. This could be possible if the animal holds a constant gradient between blood and external medium, although the actual blood concentration alters to permit the constant gradi- ent. Over such a range of stress, then, the constant rate of regulation would be 70 te. u 60 * < w m 8* 50 40 -I < Ul o o o 30 20 10 r. uj O K o 0. ISOTONICITY j 25 5O 75 100 125 150 MEDIUM CONCENTRATION ( % SEA WATER) FIGURE 5. Crabs sustain greater osmotic gradients at equilibrium as greater stresses are imposed. Points are approximate mean values and for Pachygrapsus are calculated from the present investigation; values for Uca, H. oregoncnsis, and H. nudus, are calculated from Jones (1941). expected to cause no variations in the total metabolic rate assuming constant relative roles of the various regulatory organs. On the other hand, if an increasing gradient is established more work would be expected. It has been pointed out recently by Potts (1954) that semi-permeable animals inhabiting fresh water could maintain their blood hypertonic to the medium with less work by excretion of dilute urine than by regulating at the tissue surfaces which are exposed to the external 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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