Influence of increased temperature on the standard metabolism in the marine bivalves acclimated to seasonal water temperature: I. effects of acclimation temperature

摘要

Influence of increased temperature on the standard metabolism in three species of marine bivalves, Crassostrea gigas, Ruditapes philippinarum and Mytilus edulis, acclimated to seasonal water temperatures and collected from the south coast of Korea,were examined in the laboratory. The standard oxygen consumption and filtration rates in the 3 species were measured respectively at the experimental temperature, 4, 7 and 10 deg C or 3, 6 and 9 deg C higher than the mean seasonal water temperature. Whenthe experimental temperatures were higher than the seasonal water temperature, the rates of C. gigas decreased in autumn and spring, and increased in winter, while there was thermal stress in summer. The rates of R. philippinarum increased in spring when the experimental temperatures were 3 deg C and 6 deg C higher than the seasonal water temperature, but the rates increased in autumn and winter when the experimental temperature was even 9 deg C higher than the seasonal water temperature. In summer, metabolic activities of R. philippinarum decreased significantly at temperature higher than acclimation temperature. The rates of M. edulis increased in spring when the experimental temperatures were 3 deg C higher than the seasonal water temperature but the rates were stressed by the increased temperature above 3 deg C. In winter, increased temperature did not affect the metabolic activities of M. edulis. These results suggested that the standard metabolism of the three marine bivalves in summer was stressed by the increased temperature, whereas the metabolism was activated in winter.