温度及pH对隆线溞生长和生殖的影响

Effects of Temperature and pH on the Population Dynamics Parameters of Daphnia carinata

研究了隆线溞(Daphnia carinata)在不同温度(15、20、25、30℃)和pH(6、7、8、9、10)影响下的内禀增长率(rm)、周限增长率(λ)、平均世代周期(T)、净生殖率(R0)、平均寿命、第一怀卵日、平均生殖间隔期和总生殖量。结果表明,温度对隆线溞的生命参数有显著影响,30℃组的内禀增长率(rm)、周限增长率(λ)和平均世代周期(T)均显著高于其他组,但是该组的平均寿命、第一怀卵日和平均生殖间隔期均低于其他组。pH对隆线溞生命参数影响总体上不明显,pH 7、8、9和10各组之间没有显著差异,但pH6组与其他各组差异较显著,该组的内禀增长率(rm)和周限增长率(λ)显著高于其他组。

The intrinsic of increase（ r ） , finite rate of increase（λ ） , mean generation time（T） , net reproduction rate（ R0 ） , mean lifespan, age at first brood, mean interval between clutch and fecundity of Daphnia carinata were studied under different temperatures （ 15,20,25,30℃ ） and pH values （ 6,7,8,9,10 ）. The results indicated that temperature was of great importance to the reproduction of D. carinata. The mean generation time （T） , mean lifespan,age at first brood, mean interval between clutch decreased with increasing temperature,while intrinsic of increase（ rm ） and finite rate of increase（λ ） increased with temperature varying from 15 - 30℃. The intrinsic of increase（ rm ） at 30℃was significantly higher than in other groups. Effects of pH on the survival and neonate production of D. carinata were also studied. Results showed that there was no significant difference among pH 7, 8,9 and 10. When D. carinata was reared at pH 6, intrinsic of increase（ rm ） and finite rate of increase（k） were significantly higher than those reared in other groups.