. The Biological bulletin. Biology; Zoology; Marine biology. 142 J. J. DWYER AND L. E. BURNETT. PcOjS PCO22 PH Figure 1. A pH-HCOs" diagram showing the acid-base status of oyster hemolymph at 0, 5, and 24 h of air exposure at 21 °C. PCO2 isopleths (curved Unes) are given in torr. In vitro buffer lines are shown as dashed lines. Circles represent oysters uninfected with Perkinsus marinus; triangles represent oysters with "high" infections. Values are mean ± SEM; n for each experiment ranged from 22 to 56. uninfected group had a higher PCO2 (~42 torr) than did the highly infected
. The Biological bulletin. Biology; Zoology; Marine biology. 142 J. J. DWYER AND L. E. BURNETT. PcOjS PCO22 PH Figure 1. A pH-HCOs" diagram showing the acid-base status of oyster hemolymph at 0, 5, and 24 h of air exposure at 21 °C. PCO2 isopleths (curved Unes) are given in torr. In vitro buffer lines are shown as dashed lines. Circles represent oysters uninfected with Perkinsus marinus; triangles represent oysters with "high" infections. Values are mean ± SEM; n for each experiment ranged from 22 to 56. uninfected group had a higher PCO2 (~42 torr) than did the highly infected group (~28 torr). The acidosis in the highly infected group was uncompensated at 5 h of air exposure, but was partially compensated at 24 h. At 30 °C, highly infected oysters had a pH significantly {P = ) different from that of uninfected oysters at 0 h. Both groups underwent a respiratory acidosis in- duced by air exposure (Fig. 2). The acidosis at 24 h was greater for the uninfected oysters (pH ) than for the highly infected group (pH ). The uninfected oysters showed no significant compensation after 24 h of air ex- posure. The uninfected group had a PCO2 similar to that at 21°C (~44 torr) and greater than that of the highly infected group (~31 torr). The acidosis in the highly in- fected group was uncompensated after 5 h of air expo- sure, but was partially compensated at 24 h. The change in hemolymph pH with temperature in uninfected oys- ters (ApH/°C = ) was twice that predicted for pas- sive temperature effects on pH and commonly reported for ectotherms. Calcium ion concentration in hemolymph of unin- fected oysters was lower than that in hemolymph of oysters with low or high infections {P < ; Kruskal-Wallis one- way analysis of variance on ranks; Table I). Exposure of oysters to air resulted in an elevation of hemolymph cal- cium ion concentrations in all treatment groups (Ta- ble I). Oysters emersed and exposed to nitrogen for 24 h had an
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