. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 E. V. THUESEN AND J. J. CHILDRESS. 1200 0 200 400 600 800 1000 1200 Minimum depth of occurrence (m) Figure 6. (A) Citrate synthase activities of California medusae (•) as a function of minimum depth of occurrence (Table II) compared to pelagic fish data (D) from the same region. The slope of the regression line for medusan data is not significantly different from zero. The slope of the regression line for the fish data is y = °56; R = (Childress and Somero, 1979; Wells and Childress, unpuh.). Results of ANCO
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 E. V. THUESEN AND J. J. CHILDRESS. 1200 0 200 400 600 800 1000 1200 Minimum depth of occurrence (m) Figure 6. (A) Citrate synthase activities of California medusae (•) as a function of minimum depth of occurrence (Table II) compared to pelagic fish data (D) from the same region. The slope of the regression line for medusan data is not significantly different from zero. The slope of the regression line for the fish data is y = °56; R = (Childress and Somero, 1979; Wells and Childress, unpuh.). Results of ANCOVA show that the regressions of the two groups are significantly different from one another, P < (B) Lactate dehydrogenase activities of California medusae (•) as a function of minimum depth of occurrence (Table II) compared to pelagic fish data (D) from the same region. The slope of the regression line for medusan data is not significantly different from zero. The slope of the regression line for the fish data is y = ~°"; R = (Childress and Somero, 1979). Results of AN- COVA show that the regressions of the two groups are significantly dif- ferent from one another, P R () in chaetognaths > R () in medusae. We propose that in animals such as medusae, which lack mechanisms for transport of oxygen within their bodies, the diffusion of oxygen may limit the effec- tiveness of oxygen supply to mitochondria while the in- herent properties of the mitochondria and associated en- zymes may remain the same as in other groups. Therefore, the mitochondria! aerobic metabolism realized in vivo would be limited by the supply of oxygen in these animals. The suggestion that the mitochondrial metabolism is lim- ited by oxygen diffusion to the mitochondria is supported by our preliminary findings that these medusae generally show a dependent pattern of metabolism when exposed to lower oxygen concentrations. In such a situation, the synthesis of "ex
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