. The Biological bulletin. Biology; Zoology; Marine biology. CALLIANASSA RESPIRATORY ADAPTATIONS 129. Figure 3. Mean oxygen consumption (open circles) and mean ventilatory rate (solid circles) among specimens of Callianassa jamaicense as oxygen is depleted from a sealed bottle. Each open circle is mean value for 10 animals and each solid circle is mean value for eight animals. Vertical lines indicate ranges; rectangles indicate standard errors; horizontal lines indicate span of oxygen tension over which means are taken. Wet weights range from to g. Temperature was maintained at 25 ±0
. The Biological bulletin. Biology; Zoology; Marine biology. CALLIANASSA RESPIRATORY ADAPTATIONS 129. Figure 3. Mean oxygen consumption (open circles) and mean ventilatory rate (solid circles) among specimens of Callianassa jamaicense as oxygen is depleted from a sealed bottle. Each open circle is mean value for 10 animals and each solid circle is mean value for eight animals. Vertical lines indicate ranges; rectangles indicate standard errors; horizontal lines indicate span of oxygen tension over which means are taken. Wet weights range from to g. Temperature was maintained at 25 ±° C; salinity was 20 ± ». min at 0 mmHg. Animals held at complete anoxia continued to decrease pleopod activity and, after 2 to 4 hr, stopped ventilating unless disturbed. When Pn2 was abruptly decreased from normoxia (150 mmHg) to hypoxia (37 mmHg) in a flow-through respirometer, specimens of C. jamaicense reduced Vo2 by more than 50% for 2 to 3 hr (Fig. 4). Oxygen consumption gradually increased after 5 hr of hypoxia and after 9 hr was near 75% of Vn2 in normoxia. In normoxia, pleopod activity ranged from 14 to 18 strokes/min. As P02 decreased to 37 mmHg, pleopod activity at first increased slightly but soon subsided to rates less than those in normoxia. When introduction of hypoxic water (37 mmHg) followed 12 hr of anoxia, the Vo2 of C. jamaicense was initially just above that observed under normoxia (Fig. 5). The V02 in hypoxia decreased slowly from the rates measured shortly after termination of anoxia. Pleopod activity, which was negligible during anoxia,. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mas
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