不同斜生栅藻密度下布洛芬浓度对多刺裸腹溞生命表统计学参数的影响

以多刺裸腹溞为受试生物,在较低(0.5×10⁶ cells·mL^-1)、中等(1.0×10⁶ cells·mL^-1)和较高(2.0×10⁶ cells·mL^-1)的斜生栅藻密度下研究了不同浓度(0、0.45、0.9、1.8、3.6、7.2 和14.4 mg·L^-1)的布洛芬对多刺裸腹溞生命表统计学参数的影响.结果表明: 在较低和较高的食物密度下,布洛芬浓度分别对多刺裸腹溞的种群内禀增长率和生命期望具有显著性影响;但在3个食物密度下,布洛芬浓度对多刺裸腹溞的世代时间、净生殖率和总生殖率均无显著性影响.与对照组相比,在较低的食物密度下,暴露于0.45、0.9、3.6和14.4 mg·L^-1布洛芬溶液中的多刺裸腹溞的种群内禀增长率显著降低;在较高的食物密度下,暴露于3.6 和14.4 mg·L^-1布洛芬溶液中的多刺裸腹溞的生命期望显著延长.表明在较低的食物密度下,布洛芬对多刺裸腹溞的种群增长具有不利的影响;但在中等和较高的食物密度下其不利影响消失.在较高的食物密度下,布洛芬对多刺裸腹溞的存活具有促进作用;但在较低和中等食物密度下其促进作用并未出现.布洛芬对多刺裸腹溞部分生命表统计学参数的影响因食物密度的不同而异.

Effects of ibuprofen concentration on life table demography of Moina macrocopa under different densities of Scenedesmus obliquus

The cladoceran Moina macrocopa was used as test animal to investigate the effects of ibuprofen concentrations (0, 0.45, 0.9, 1.8, 3.6, 7.2 and 14.4 mg·L^-1) on its life table demographic parameters under low (0.5×10⁶ cells·mL^-1), medium (1.0×10⁶ cells·mL^-1), and high (2.0×10⁶ cells·mL^-1) densities of Scenedesmus obliquus. The results showed that at low and high food levels, ibuprofen concentration significantly affected the intrinsic rate of population increase and the life expectancy of M. macrocopa, respectively. At all the three food levels, however, ibuprofen concentration did not significantly affect the generation time, net and gross reproduction rate of M. macrocopa. Compared with the controls, the intrinsic rate of population increase of M. macrocopaexposed to ibuprofen at 0.45, 0.9, 3.6 and 14.4 mg·L^-1 was significantly decreased at low food level. At high food level, the life expectancy at hatching of M. macrocopa exposed to ibuprofen at 3.6 and 14.4 mg·L^-1 was significantly increased. The results indicated that at low food level, certain concentrations of ibuprofen had negative effect on the population growth of M. macrocopa, which disappeared at medium and high food levels. At high food level, ibuprofen had positive effect on the survival of M. macrocopa, which disappeared at low and medium food levels. The effects of ibuprofen concentration on demographic parameters of M. macrocopa were dependent on food levels.