. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 138 TORRES, GLUCK AND CHILDRESS -e 20 > CM O j5 iii h- cr tr o UJ DC 16 12 8. 0 20 40 60 80 OXYGEN PARTIAL PRESSURE (mm Hg) 100 120 FIGURE 1. Relationship of respiratory rate to oxygen partial pressure in animals with (circle) and without (triangle) the use of pleopods. Error bars indicate 95% confidence limits around each point. Each value is the mean rate of nine animals. Regression lines through the points were calculated using the least squares method. One line was calculated for points 20 mm Hg and above, one line wa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 138 TORRES, GLUCK AND CHILDRESS -e 20 > CM O j5 iii h- cr tr o UJ DC 16 12 8. 0 20 40 60 80 OXYGEN PARTIAL PRESSURE (mm Hg) 100 120 FIGURE 1. Relationship of respiratory rate to oxygen partial pressure in animals with (circle) and without (triangle) the use of pleopods. Error bars indicate 95% confidence limits around each point. Each value is the mean rate of nine animals. Regression lines through the points were calculated using the least squares method. One line was calculated for points 20 mm Hg and above, one line was calculated for points 20 mm Hg and below. The intersection of the lines was called the critical oxygen partial pressure (Pc). Lines were not significantly different. For animals with the use of pleopods, r is for the line above 20 mm Hg, and r is for values below; mean weight is ± (x±). For animals without the use of pleopods, r is for above 20 mm Hg, and r is below; mean weight is ± See text. below. The intersection of the two lines was called the critical oxygen partial pressure (Pc), the partial pressure of oxygen below which the metabolic rate ceases to be independent of external oxygen concentration (Prosser, 1973). The Pc for control animals was approximately 17 mm Hg, that for animals without the use of pleopods was approximately 20 mm Hg. The variation about the regres- sion lines makes this difference meaningless. Data collected using individual animals yielded similar results. These respira- tory rates were tested using the Wilcoxon test for paired comparisons, at nine PO2 values above the Pc. Significance levels of the data for the three animals tested were all » P -- , strongly supporting the null hypothesis: treatment and control are the same. It should be mentioned that the metabolic rates obtained in this set of experiments were substantially lower than those reported by Thompson and Pritchard (1969), despite t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
