Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland.
Water Sci Technol. 2011;64(2):403-8. doi: 10.2166/wst.2011.644.
The novel idea of using rotifers Lecane inermis (Rotifera, Monogononta) as a tool to overcome activated sludge bulking generates an on-going need to study rotifer biology. The results of biological research on rotifers can serve to improve the method so that it can be most effective when applied in treatment plants. The aim of this study was to test the effect of temperature on four selected rotifer clones originating from different treatment plants. The rate of population development from a single individual (parthenogenetic female) during a 10-day experiment was measured at three temperatures: 8, 15 and 20 degrees C. The temperatures used reflect the annual temperature distribution in the majority of municipal wastewater treatment plants in the temperate zone. The growth rate coefficient (r) and doubling time (tD) were calculated for each clone. Under the most favourable conditions (20 degrees C), rvalues varied between 0.41 and 0.47 d and doubling time between 1.5 and 1.7 d. At a temperature of 15 degrees C, the doubling time was approximately two times longer (2.5-3.4 d). The strongest intraspecific variations were observed at the lowest temperature of 8 degrees C. At this temperature, one of the clones almost failed to proliferate, and another exhibited a doubling time of 7.9 d. The doubling times were a few times greater for the remaining two clones (60 d for Lk1, 33.3 d for Lk4). These results could be very useful in predicting the chances that the rotifers would survive in a biological reactor in a wastewater treatment plant at the temperatures used in these reactors.
利用轮虫（Lecane inermis）（轮虫纲，单巢目）来克服活性污泥膨胀的新想法引发了人们对轮虫生物学进行持续研究的需求。轮虫生物学研究的结果可以用来改进该方法，使其在处理厂中得到最有效的应用。本研究旨在测试温度对源自不同处理厂的四个选定轮虫克隆体的影响。在 10 天的实验中，从单个个体（单性生殖雌性）中测量种群发展的速度，实验在三个温度下进行：8、15 和 20°C。使用的温度反映了温带地区大多数城市污水处理厂的年度温度分布。为每个克隆体计算了种群增长率系数(r)和倍增时间(tD)。在最有利的条件（20°C）下，r 值在 0.41 到 0.47 d 之间变化，倍增时间在 1.5 到 1.7 d 之间。在 15°C 的温度下，倍增时间大约延长了两倍（2.5-3.4 d）。在最低温度 8°C 下观察到最强的种内变异。在这种温度下，一个克隆体几乎无法繁殖，另一个克隆体的倍增时间为 7.9 d。对于其余两个克隆体，倍增时间要大几倍（Lk1 为 60 d，Lk4 为 33.3 d）。这些结果对于预测轮虫在污水处理厂生物反应器中在这些反应器中使用的温度下存活的机会非常有用。
