. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 JAMES J. CHILDRESS. 0 2 4 6 8 10 12 14 16 CRITICAL PARTIAL PRESSURE OF 0_ (mmHg) FIGURE 2. Relationship between respiration and Pc in Gnathophausia ingens; — - regres- sion line X = Y + (A' as dependent variable) 95% confidence ± , ± ; r = , - ----- 95% confidence interval for mean X at a given Y, - 95% confidence interval for individual .Y at a given Y. Regulated oxygen consumption rate is de- fined as the lowest rate sustained for more than 10 minutes between 20 and 70 mm Hg of oxy
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 JAMES J. CHILDRESS. 0 2 4 6 8 10 12 14 16 CRITICAL PARTIAL PRESSURE OF 0_ (mmHg) FIGURE 2. Relationship between respiration and Pc in Gnathophausia ingens; — - regres- sion line X = Y + (A' as dependent variable) 95% confidence ± , ± ; r = , - ----- 95% confidence interval for mean X at a given Y, - 95% confidence interval for individual .Y at a given Y. Regulated oxygen consumption rate is de- fined as the lowest rate sustained for more than 10 minutes between 20 and 70 mm Hg of oxygen. Critical partial pressure (Pc) is defined as the partial pressure of oxygen at the point where the lowest sustained rate intersects the dependent part of the curve or its extension. and 50 ml/minute. Flow rate was also calculated from the measured oxygen consumption rate and the amount of oxygen removed as the water passed over the animal's gills. A Beckman Macro Electrode was used to monitor oxygen in ex- haled water because this electrode is insensitive to variations in flow rate. RESULTS Oxygen consumption rate The respiratory rates measured during a single run varied a great deal, probably due to "spontaneous" variations in the experimental animal's activity. This variation made it extremely difficult to assign a single representative value for the respiratory rate of an animal for the duration of a given experiment. Gnathophausia ingens is a very active and readily excited animal, and the lowest activity which it usually shows in the laboratory is slow swimming. For this reason, I have used the lowest sustained (, sustained for at least 10 minutes) rate between the oxygen partial pressures of 20 and 70 mm Hg as the "assigned" respiratory rate for a given run. These rates were plotted against the wet weight of the animal and the regression equation of oxygen consumption as a function of wet weight was fitted by the least squares method (Fig.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
