温度和个体大小对单齿螺耗氧率和排氨率的影响

采用静水法测定了不同温度、不同个体大小的单齿螺耗氧率和排氨率。结果表明:在16-33℃的实验温度范围内单齿螺的耗氧率(R_O)和排氨率(R_N)与软体部干重(W)都呈负相关,它们之间关系可以分别用幂函数R_O=aW^-b和R_N=a₁W^-b1表示。16～29℃温度范围内单齿螺的耗氧率和排氨率均随温度的升高而增加,29℃时耗氧率和排氨率达到最大值,当温度继续升高超过29℃后,耗氧率和排氨率则随温度的升高而下降,耗氧率、排氨率与温度之间呈显著的指数函数关系R_O=ce^dT和R_N=c₁e^d1T;不同个体大小单齿螺的O:N比在16～20℃时较大,Q₁₀取值范围0.56-3.74,平均值为1.64。方差分析表明,温度、软体部干重对单齿螺的耗氧率和排氨率均有极显著的影响(P<0.01)。

Effects of temperature and body size on oxygen consumption rate and ammonia excretion rate of Monodonta labio

Effect of temperature and body size on oxygen consumption rate and ammonia excretion rate of Monodonta labio were determined using hydrostatic method. The results showed that there were negative relationship between dry weight of soft tissue (W) and oxygen consumption rate (R_O) or ammonia excretion rate (R_N) of Monodonta labio at 16-33℃. The relationships between dry weight and R_O and between dry weigh and R_N could be expressed by a power function as: R_O=aW^-b and R_N=a₁W^-b1. The oxygen consumption rate and ammonia excretion rate of Monodonta labio increased with increasing water temperature and reached the maximum at 29℃. The relationships between water temperature and R_O and between dry weigh and R_N could be expressed by an exponential function as: R_O=ce^dT and R_N=c₁e^d1T. The highest R_O/R_N (atomicity O/N) was observed at the temperature between 16-20℃. The Q₁₀ value ranged from 0.56 to 3.74. ANOVA showed that the R_O and R_N were significantly affected by water temperature and dry weight of soft tissue (P<0.01).