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- W2323218442 abstract "Ventilation, circulation, and acid-base regulation were assessed in Procambarus clarki exposed to acidified water. Scaphognathite rates ($f_{sc}$), branchial water pressures, heart rates ($f_{H}$), hemolymph pH, total CO₂ (CC0₂), and partial pressures of CO₂ and O₂ (PCO₂ and PO₂) were measured in crayfish acclimated to deionized water (pH 6.8) in an aerated, flow-through system. The water was acidified to pH 3.8 with H₂SO₄ and maintained at pH 3.8 for 96 h. The water in the system then was replaced with deionized water (pH 6.8), and animals were allowed to recover for 48-72 h. In acid conditions,$f_{SC}$ increased rapidly and remained elevated for the first 48 h but then decreased significantly by 72 h. Branchial pressures were depressed throughout the entire acid exposure period. Heart rate also increased significantly over the first 24 h of acid exposure and later decreased and remained near normal through recovery. During recovery, $f_{SC}$ continued to decrease, and branchial pressures remained depressed. Hemolymph acid-base variables all decreased initially; after 96 h, pH and PCO₂ had recovered, but CCO₂ remained low. An alkalosis was observed after 72 h of recovery and was associated with an elevated CCO₂ and hypocapnia. There were no significant changes in postbranchial PO₂ during the experiment. These strong ventilatory and circulatory responses seem to be stimulated by factors other than oxygen levels. The hyperventilatory response probably is the cause of a decrease in PCO₂, but other mechanisms must be responsible for the final recovery of acid-base balance." @default.
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- W2323218442 date "1988-09-01" @default.
- W2323218442 modified "2023-10-16" @default.
- W2323218442 title "Ventilatory and Circulatory Responses of the Crayfish, Procambarus clarki, to Low Environmental pH" @default.
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- W2323218442 doi "https://doi.org/10.1086/physzool.61.5.30161261" @default.
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