腐食酪螨实验种群生命表

研究了腐食酪螨在5个温度梯度下的实验种群生命表。结果表明,在12.5℃和30℃时,该种群的瞬时增长力和周限增长率均较小,分别为0.0556、1.0572和0.0568、1.0585。说明温度过低或过高,均不利于该螨的发育繁殖。20℃虽然世代净生殖率最高,但由于产卵时间较长,平均日产卵量较少,瞬时增长力也较小。25℃时,该种群的存活率最高(0.7292),瞬时增长力和周限增长率最大(0.2638和1.3019),日均产卵量最多,达21.87粒。

Laboratory population life table of Tyrophagus putrescentiae at different temperatures

Life table parameters of the laboratory populations of Tyrophagus putrescentiae, including net reproduction rate (R0), finite rate of increase (λ), doubling time for population (t), intrinsic rate for natural increase (rm) and mean generation time (T) were studied under five constant temperatures. The results showed that λ and rm were 0.055 6 and 1.0572 at 12.5 ℃, respectively, and those at 30 ℃ were 0.056 8 and 1.058 5, respectively. These numbers were smaller than those at other temperatures, which indicated that high or low temperature was unfavorable to mite populations. Though R0 was the highest at 20 ℃, the mean egg number is lower for longer reproduction time. The highest survival rate, rm, λ and mean egg number were observed at 25 ℃, which were 0.729 2, 0.263 8, 1.301 9 and 21.87, respectively.