. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN UPTAKE OF STYELA 301 II Statistics for the relationship between iritiml oxygen tension, I',-, and body mass, M. J',: da lines slightly with increasing body size, indicating an increasing capacity to regulate oxygen consumption. Temperatuie Equation Correlation coefficient (4) Significance of (r) PC = 138 - M PC = 129 - M PC = 121 - M PC = 116 - M For the oxygen consumption of Styela plicata acclimatized to temperatures from 10°
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN UPTAKE OF STYELA 301 II Statistics for the relationship between iritiml oxygen tension, I',-, and body mass, M. J',: da lines slightly with increasing body size, indicating an increasing capacity to regulate oxygen consumption. Temperatuie Equation Correlation coefficient (4) Significance of (r) PC = 138 - M PC = 129 - M PC = 121 - M PC = 116 - M For the oxygen consumption of Styela plicata acclimatized to temperatures from 10° to 20° C, Qio ranges from 5 to 2 and averages 3. However, between 20° and 30° C, Qio declines to and averages , indicating a relative temperature in- sensitivity and minimally increased metabolic costs for individuals acclimatized to summer temperatures. Partial temperature independence might be expected as a result of acclimatization. To test this possibility, the oxygen consumption of Styela acclimatized to ° C was measured at ° C and 10° C in acute experiments with immediate transfer from ° C to the experimental temperature. The transferred animals displayed a stable V02 after approximately one half hour. The data are presented in Table I. There are no significant differences between the acute and acclimatized rates at ° C and 10° C, although the acute rate is 15% higher than the acclimatized rate at ° C. The data suggest some acclimatization to summer temperatures (° C), but the magnitude of the change is small and statistically undetectable. The effect of oxygen tension upon oxygen uptake can be summarized by means of the critical oxyge tension, , the partial pressure of oxygen at which uptake becomes dependent on P0-2. Larger individuals of Styela plicata have lower critical oxygen tensions (Table II) and therefore better regulation of oxygen consumption. 150 c. o vi C 01 - 100 c 01 O) > X o ' 50. 0 10 20 30 Temperature (
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
