摘要
The effects of acute progressive hypoxia on the respiration rate of the Chinese freshwater crab, Eriocheir sinensis, acclimated at three temperatures were investigated with a closed respiromet er. E. sinensis can maintain its respiration rate down to the critical point (Pc) and from this point its respiration rate declines rapidly, reaching zero at a lower ambient oxygen concentration called the zero respiration oxygen concentration. Because of this, a new hyperbolic equation is introduced to express the relationship between respiration rate and ambient oxygen concentration. A new method for calculating the PC value is also developed. The PC values for E. sinensis at 20-35℃ range from 1.92-3.47 mg/1.
本文用密闭式呼吸仪研究了急性逐步低氧对中华绒螯蟹(又名河蟹)呼吸率的影响、研究发现,河蟹是一种很好的氧调动物。当溶氧在一定范围内下降时,河蟹能维持其呼吸率不变,直到临界氧浓度,或临界点。而后,随着溶氧的进一步下降,其呼吸率迅速降低,并在溶氧未至零值时,呼吸率为零。作者将呼吸率为零时的氧浓度称为零呼吸氧浓度,或零呼吸点。鉴于零呼吸点的存在,作者提出了一种能更好地描述水生动物呼吸率和溶氧关系的双曲线方程,并在此基础上,推导出一种更简便、合理的临界氧浓度计算方法。在20—35℃,河蟹的临界氧浓度范围为1.92—3.47mg/L。
