Mathematical Description of the Immunochemical Response of the Manila Clam (Ruditapes philippinarum) to Extreme Temperature Reductions
2025
Runling Li | Jianjun Wang | Wei Han | Jianying Gong | Jun Ding
The activity levels of superoxide dismutase (SOD), catalase (CAT), lysozyme (LZM), acid phosphatase (ACP), and alkaline phosphatase (AKP) can reflect the immune status of an organism. The immune status may be affected by extreme changes in the weather, especially rapid declines in temperature. In this study, the SOD, CAT, LZM, ACP, and AKP activity levels of the Manila clam (Ruditapes philippinarum) were measured for 24 h while the seawater temperature rapidly decreased to the freezing point from 8 °:C, 4 °:C, and 2 °:C to analyze its immunochemical response to temperature decline. The results showed that the enzyme activity levels fluctuated with time as the temperature declined. By fitting the data, a model was obtained to describe the variation in immune enzyme activity within a short time period as temperature declined. The mathematical description included the stress response and the direct temperature response. The enzyme activity was adjusted rapidly as a stress response in the short term as the temperature declined, before it tended to stabilize. The direct temperature response also caused the enzyme activity to change as the temperature declined to the freezing point. The correlation coefficient between the fitted model and the actual enzymatic activity levels exceeded 0.87, which demonstrated that the mathematical description was adequate.
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