温度和规格对扁玉螺耗氧率和排氨率的影响

Effects of Temperature and Body Size on Oxygen Consumption Rate and Ammonia Excretion Rate of Neverita Didyma

在实验生态条件下 ,研究了温度对不同个体大小扁玉螺耗氧率和排氨率的影响。实验结果表明 ,在实验温度 ( 1 0～ 35℃ )条件下 ,扁玉螺的个体耗氧率 (R′O) [mg/个·h]和个体排氨率 (R′N) [mg/个·h]与软体部干重 (W)呈正相关 ,而耗氧率 (RO) [mg/g·h]、排氨率 (RN) [mg/g·h]与软体部干重呈负相关 ,二者之间均可用幂函数表示 ;扁玉螺的耗氧率和排氨率均随温度的升高而增加 ,但超过 30℃后 ,耗氧率则下降 ,耗氧率 (RO)、排氨率 (RN)与温度之间呈明显的指数函数关系。不同规格扁玉螺的耗氧率和排氨率的比值 (原子数O :N)在 2 0℃时最大。方差分析表明 ,温度、软体部干重对扁玉螺的耗氧率和排氨率有极显著的影响 (P <P0 .0 1 )。

The effects of temperature on oxygen consumption rate and ammonia excretion rate of Neverita didyma were studied in laboratory. The results showed that the oxygen consumption( R′_O )[mg/个·h]and ammonia excretion( R′_N )[mg/个·h] of Neverita didyma increased but the oxygen consumption rate( R_O )[mg/g·h] and ammonia excretion rate ( R_N )[mg/g·h] decreased with its increasing dry weight of soft tissue ( W )[g]. The relationship between body weight and R′_O or R′_N could be described as a power function, R′_O=aw b or R′_N=cw d . The oxygen consumption rate and ammonia excretion rate of Neverita didyma increased with water temperature rising but the oxygen consumption rate decreased while surpassing 30℃. The relationship between water temperature and R_o or R_N could be represented by R_o=r_1e r_2x or R_N=q_1e q_2x . The ratio (atomicity O:N ) between R_O and R_N was highest at 20 ℃. ANOV showed that the R_O and R_N were significantly affected by water temperature and dry weight of soft tissue.