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- W2015988511 abstract "The South American lungfish (Lepidosiren paradoxa) has well-developed lungs and highly reduced gills. To evaluate acid-base regulation, we applied hypercarbia while blood gases and pulmonary ventilation were measured for up to 48 h. Dorsal aortic blood was analyzed, and pulmonary ventilation was measured by pneumotachography. Two protocols were used: (1) normocarbia (control) followed by aquatic hypercarbia (7% CO2 approximately 49 mmHg), gas phase normocarbic; and (2) normocarbia (control) followed by combined aquatic/gas phase hypercarbia (7% CO2). Normocarbic values were pHa~7.5, Paco2 approximately 17 mmHg, and [HCO-3]pl approximately 22 mM. For protocol 1, the first hour of exposure increased Paco2 from 17.0 to 37.4 mmHg, and pHa fell to 7.21 and remained there for the rest of the experiment. At 3 h, pulmonary ventilation reached sixfold the normocarbic value but then decreased. For protocol 2, combined gas phase/water hypercarbia had a large effect on acid-base status. Thus, Paco2 increased gradually to 74 mmHg (pHa=7.15) at 48 h. At 3 h, ventilation reached a sixfold increase relative to normocarbic control but then rose further to a 60-fold peak at 6 h, followed by a gradual decline. As in some salamanders and air-breathing teleosts, there was no evidence of active extracellular modulation bicarbonate." @default.
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- W2015988511 date "2005-11-01" @default.
- W2015988511 modified "2023-09-25" @default.
- W2015988511 title "Acid‐Base Regulation in the South American Lungfish<i>Lepidosiren paradoxa</i>: Effects of Prolonged Hypercarbia on Blood Gases and Pulmonary Ventilation" @default.
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- W2015988511 doi "https://doi.org/10.1086/432859" @default.
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