. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THALASSINID RESPIRATORY ADAPTATIONS 279 ± ml O2 Xg wet wf1 X hr1. U. pugettensis (n = 8; mean wt ± g), on the other hand, has a mean metabolic rate of ± ml O2 X g wet wi'1 X hr*1, or twice that of Callianassa. The difference between the means is significant at the 1% level (t = || ^ = ). Effects of activity on oxygen consumption were not measured in the present investigation. We believe that the rates reported above should be considerd as "routine" metabolic rates (as
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THALASSINID RESPIRATORY ADAPTATIONS 279 ± ml O2 Xg wet wf1 X hr1. U. pugettensis (n = 8; mean wt ± g), on the other hand, has a mean metabolic rate of ± ml O2 X g wet wi'1 X hr*1, or twice that of Callianassa. The difference between the means is significant at the 1% level (t = || ^ = ). Effects of activity on oxygen consumption were not measured in the present investigation. We believe that the rates reported above should be considerd as "routine" metabolic rates (as defined by Fry, 1957). 105 100- 80- 2? "5 c E < 40- or o: < 20-. V V V -O—-O. J L OXYGEN CONCENTRATION, ml/liter 8 13 27 40 53 80 107 OXYGEN TENSION, mmHg 133 160 187 FIGURE 3. Heart rate of Callianassa californiensis in beats per minute at various oxygen tensions at 10° C; inactive shrimp O, • ; active V; solid line represents two shrimp. The metabolic rate curve, determined by liner regression, of a recently molted U. pugettensis is also seen in Figure 2. It is apparent that metabolic rate is di- rectly dependent upon external oxygen concentration and that a regulatory phase is absent. This postmolt Upogebia has a notably greater respiratory rate at higher oxygen tensions than the non-molted Upogebia; however at tensions less than 45-50 mm Hg, metabolic rates are comparable. A criticism of the sealed jar method used in the present study involves the possible effect of the accumulation of waste products as the animal depletes the available oxygen. However, the fact that shrimp were shown to survive in a sealed jar from three to six days (Table I) leads us to believe that accumulation of waste products in 10-20 hours probably has little effect on the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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