. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 214 PAUL A. DEHXEL When winter animals (Fig. 3) at their own approximate temperature and salinity field conditions (5° C.; 75% sea water) were compared with summer crabs at their corresponding conditions (15° C.; 25% sea water), blood concentra- tion of winter crabs was more hypertonic (25% sea water difference; P = ). When the blood of winter crabs was tested immediately upon removal from the intertidal zone, its concentration was always higher than that of summer crabs similarly removed. Further, comparison at either s
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 214 PAUL A. DEHXEL When winter animals (Fig. 3) at their own approximate temperature and salinity field conditions (5° C.; 75% sea water) were compared with summer crabs at their corresponding conditions (15° C.; 25% sea water), blood concentra- tion of winter crabs was more hypertonic (25% sea water difference; P = ). When the blood of winter crabs was tested immediately upon removal from the intertidal zone, its concentration was always higher than that of summer crabs similarly removed. Further, comparison at either season showed the blood con- centration always to be higher than the intertidal sea water concentration from which they were removed. 80 cc UJ <70 UJ ^60 Q UJ 40 30 X UJ cO Q O O CD UJ Q < CC O 20 io ° HEMIGRAPSUS OREGONENSIS • • SUMMER (I5°C) --- • WINTER (5°C) HE MIGRAPSU S NU DUS O—O SUMMER (I5°C) O---O WINTER ( 5 °C). ISOTONICITY 6 12 25 50 75 100 125 150 175 MEDIUM CONCENTRATION (% SEA WATER) FIGURE 4. Relationship of the gradient between blood and external sea water to medium concentrations in summer (15° C.) and winter (5° C.) Hcmigrapsus oregonensis and Hcinl- grapsus nuciiis, after exposure for 48 hours to the experimental 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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