Estimation of hemolymph CO_2 solubility coefficient for acid-base balance in Pinctada fucata martensii Crassostrea gigas and Mimachlamys nobilis

アコヤガイ、マガキ、ヒオウギの酸塩基平衡におけるヘモリンパ液の二酸化炭素溶解度係数の推定

Estimation of hemolymph CO_2 solubility coefficient for acid-base balance in Pinctada fucata martensii Crassostrea gigas and Mimachlamys nobilis

The influence of temperature on the hemolymph CO_2 solubility coefficient (αco_2, µM/L/torr) was investigated in the marine bivalves, akoya pearl oyster Pinctada fucata martensii, Pacific oyster Crassostrea gigas and noble scallop Mimachlamys nobilis. Hemolymph samples were equilibrated with standard CO_2 gas mixtures to obtain expressions for αco_2 as a function of temperature. Relationships between hemolymph αco_2 and temperature (T) were expressed as follows： αco_2 = 76.88145 − 2.62637 ･ T + 0.036203 · T^2 (for P. fucata martensii), αco_2 = 94.2109 – 3.6252 · T + 0.0554 · T^2 (for C. gigas), αco_2 = 70.4591 – 1.5253 · T + 0.0103 · T^2 (for M. nobilis). In the distribution of hemolymph αco_2 values, there was no statistical significance across an interspecies comparison of αco_2. From this result, the regression was fitted using all values of αco_2 and temperature across the species, and the relationship was expressed as follows： αco_2 = 182.3717 – 24.3932 · T + 1.6396 · T^2 – 0.0492 · T^3 + 0.000536 · T^4. This polynomial is versatile equation and would yield the hemolymph αco_2 at arbitrary temperature, even with different species.

Creators Handa Takeshi

Creators Araki Akira

[ISSN]0370-9361