水温16℃から28℃のイガイにおけるヘモリンパ液の二酸化炭素溶解度と炭酸解離恒数の推定

Estimation of αCO_2 and pKapp of hemolymph acid-base balance in Mytilus coruscus between 16℃ and 28℃

The influence of temperature on the hemolymph CO_2 solubility coefficient (αco_2) and the apparent dissociation constant of carbonic acid (pKapp) in Mytilus coruscus was investigated. Mytilus coruscus hemolymph was equilibrated with standard CO_2 gas mixtures to obtain expressions for αco_2 and pKapp as a function of temperature. The relationship between αco_2 and temperature (T) is expressed as follows： αco_2 = 138.247 – 11.253 • T + 0.554 • T^2 − 0.0140 • T^3 + 0.000138 • T^4. The following relationship between pKapp and temperature was found： pKapp = 6.6407 – 0.01589 • T . The parameter units are ℃ for T and µM/L/torr for αco_2. These equations enable estimation of hemolymph αco_2 and pKapp at arbitrary temperatures and simple calculation of Pco_2 and [HCO_3^–].

Creators Handa Takeshi

Creators Araki Akira

[ISSN]0370-9361