. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 114 JAMES J. CHILDRESS. 0 4 8 12 16 20 30 40 50 60 70 OXYGEN PARTIAL PRESSURE (mmHg) FIGURE 4. Oxygen consumption rate, per cent utilization of oxygen, and ventilation volume in Gnathophausia ingens as functions of oxygen partial pressure, mean of 8 runs; - - oxygen consumption rate, % utilization = PO2 of inhaled water — PO2 of exhaled water inno/ PO2 of inhaled water measured ventilation volume, -•-•—•-•- calculated ventilation volume = OB consumed/min O2 removed/1 water passed over gills' and mg O2/kg wet wt/minut
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 114 JAMES J. CHILDRESS. 0 4 8 12 16 20 30 40 50 60 70 OXYGEN PARTIAL PRESSURE (mmHg) FIGURE 4. Oxygen consumption rate, per cent utilization of oxygen, and ventilation volume in Gnathophausia ingens as functions of oxygen partial pressure, mean of 8 runs; - - oxygen consumption rate, % utilization = PO2 of inhaled water — PO2 of exhaled water inno/ PO2 of inhaled water measured ventilation volume, -•-•—•-•- calculated ventilation volume = OB consumed/min O2 removed/1 water passed over gills' and mg O2/kg wet wt/minute. Visual observations of individuals in the respiration chamber suggested that a respiratory rate of about mg O2/kg wt wt/minute (approximately the same as the rate expressed in the regression equation) corresponded to a slow rate of swimming just sufficient to allow the animal to maintain its position in the water column. Regulation of oxygen uptake The ability of G. imjens to regulate its oxygen uptake was studied in 50 runs with 34 animals of between and 13 g wet weight. Although G. ingens has been shown to regulate its respiratory rate to a very high degree (Childress, 1968a), a single critical partial pressure (Pc) below which the species does not regulate cannot be defined because the P(. varies with the respiratory rate and the respiratory rate is quite variable (due to activity variations). This relationship is shown in Figure 2. Experimental animals continued to consume oxygen at partial pressures below the Pc until no oxygen was detectable in the chamber; but they continued swimming for less than 30 minutes after they had exhausted the supply of oxygen. These animals could be revived with aerated water up to 6 hours after their supply of oxygen had been 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 no
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
