. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 G. POLITES AND C. P. MANGUM lOOr. 10 20 30 40 0 (mm 50 60 FIGURE 2. The influence of temperature and salinity on oxygen transport in the blood of Busycoti canaliculatum. Vertical bars at right showing change in hemocyanin oxygenation. Data from Table V. in different parts of the system shifts at low temperature. At 10° C, the margin of the partly retracted foot appears to be swollen with dark blue blood, which is more highly oxygenated than postbranchial blood (Table V). The hydrostatic pressure generated in the posture
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 G. POLITES AND C. P. MANGUM lOOr. 10 20 30 40 0 (mm 50 60 FIGURE 2. The influence of temperature and salinity on oxygen transport in the blood of Busycoti canaliculatum. Vertical bars at right showing change in hemocyanin oxygenation. Data from Table V. in different parts of the system shifts at low temperature. At 10° C, the margin of the partly retracted foot appears to be swollen with dark blue blood, which is more highly oxygenated than postbranchial blood (Table V). The hydrostatic pressure generated in the posture seems to distend the pedal epithelium, and it should reduce the diffusion distance between pedal blood and ambient water. Ap- parently the foot becomes a site of oxygen uptake. If the volume of the blood increases at low salinity by about 15%, as in Buccinum undatum (Staaland; 1970), then oxygen carrying capacity should decrease measurably. In a total of 20 determinations on pedal blood and 26 on renal blood at various temperatures, there was no detectable effect of acclimation salinity. Although the copper content of blood diminishes in winter animals, pre- sumably below 10° C (Betzer and Pilson, 1974), there is no evidence in our data of a significant decrease (P < ) in the oxygen-carrying capacity of blood taken from animals acclimated to 10° C. In contrast to warm-acclimated animals (Man- gum, 1979), there is no difference in absorbance at 345 nm between samples of pedal and renal blood (N = 26), suggesting little or no dilution of pedal blood, when the animals are retracted. Using the data for oxygen equilibrium properties reported earlier (Mangum and Lykkeboe, 1979), the effect of low temperature and low salinity on the respira- tory properties of the blood is summarized in Table V and Figure 2. The removal of divalent cations from the blood at \&%c significantly reduces the cooperativity of oxygen binding to B. canaliculatum hemocyanin, which appreciably lo
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