Abstract
AbstractThe adjustments of blood respiratory properties to hypoxic conditions (PWO2 = 30 Torr) have been investigated in relation to salinity acclimation in the marine prosobranch, Buccinum undatum. (1) In whole blood the reversed Bohr effect and the cooperativity of O2 binding are not influenced by acclimation history. (2) Blood from high‐salinity (35%) animals is isoosmotic to the ambient water under normoxic conditions (PWO2 = 150 Torr), but hypoosmotic under hypoxic conditions by a regulated decrease in the Cl− ion concentration of about 90 mM. The lower [Cl−] induces, via the reversed Root effect, an approximate doubling of the amount of hemocyanin‐bound oxygen, when blood pCO2 is increased in the range 1 to 8 Torr. (3) Blood from low‐salinity (20%) animals is also isoosmotic to the ambient water under hypoxic conditions, and the reversed Root effect is present under both normoxic and hypoxic conditions. (4) At both high and low salinity no change in blood hemocyanin concentration is seen in hypoxiaacclimated animals.
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