. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OSMOREGULATION IX CRABS 363 o: UJ 60 Q <30 O O UJ UJ DQ UJ Q or O 0 HEMIGRAPSUS OREGONENSIS • • SUMMER » • WINTER HEMIGRAPSUS NUDUS O O SUMMER O O WINTER •v< V;. ISOTONICITY- 6 12 25 MEDIUM 50 75 100 CONCENTRATION 125 150 175 (% SEA WATER) FIGURE 6. Relationship of the gradient between blood and urine to medium concentrations in summer (15° C.) and winter (5° C.) Hemigrapsus orcyonoisis and Ilciiiii/ntpsiis inidus. after exposure for 48 hours to the experimental salinities. Blood values are from Uehnel (1962). tween su
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OSMOREGULATION IX CRABS 363 o: UJ 60 Q <30 O O UJ UJ DQ UJ Q or O 0 HEMIGRAPSUS OREGONENSIS • • SUMMER » • WINTER HEMIGRAPSUS NUDUS O O SUMMER O O WINTER •v< V;. ISOTONICITY- 6 12 25 MEDIUM 50 75 100 CONCENTRATION 125 150 175 (% SEA WATER) FIGURE 6. Relationship of the gradient between blood and urine to medium concentrations in summer (15° C.) and winter (5° C.) Hemigrapsus orcyonoisis and Ilciiiii/ntpsiis inidus. after exposure for 48 hours to the experimental salinities. Blood values are from Uehnel (1962). tween summer blood and urine implicates extra-renal mechanisms in hyper-osmotic regulation. Production of hypo-osmotic urine by winter-adapted animals suggests the participation of the antennary glands in hyper-osmotic regulation. Hemigrapsus audits The results for //. nudus in general paralleled those for //. arc/jniu'iisis. The blood concentration gradient for winter crabs was the greater below 125% sea water, and above this, summer crabs maintained the greater gradient (Fig. 5 ). As. 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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