Cabrera María I
Departamento de Biología, Facultad Experimental de Ciencias, Universidad del Zulia, Laboratorio de Modelos Ecológicos y Tramas Tróficas, Apdo. Postal 10 552, Maracaibo, Venezuela.
Rev Biol Trop. 2008 Sep;56(3):1149-57.
The population growth rate of the rotifer Brachionus rotundiformis (Rotifera: Brachionidae) in two-stage chemostat. The population growth rates of Brachionus rotundiformis were estimated in two-stage chemostat cultures. Chlorella sorokiniana was supplied continuously from a steady state culture growing with constant illumination on limiting nitrate. Rotifer growth in the second stage was limited by the rate of algal supply. The algal supply rate and rotifer population growth rate were determined by the second-stage dilution rate. The maximum population growth rate in the transient state of B. rotundiformis (1.96 day(-1)) was observed at 2.5 x 10(6) cel/ml of the algae whereas in the steady state the maximum population growth rate (1.09 day(-1)) was similar to the point Hopf's bifurcation predicted by Fussmann and was observed at 1 x 10(6) cel/ml of the algae. In the transient state, the rotifer's growth rate increased and the duplication time decreased at higher algal concentrations, until reaching a peak where the population growth rate begins to decrease. In the steady state, the opposite was true. The growth rates observed in this work are among the highest recorded for this rotifer in continuous cultures.
在两级恒化器中圆形臂尾轮虫（轮虫纲：臂尾轮虫科）的种群增长率。在两级恒化器培养中估算了圆形臂尾轮虫的种群增长率。小球藻从在限制硝酸盐条件下持续光照培养的稳态培养物中持续供应。第二阶段轮虫的生长受藻类供应速率限制。藻类供应速率和轮虫种群增长率由第二阶段的稀释率决定。在藻类浓度为2.5×10⁶ 个细胞/毫升时，观察到圆形臂尾轮虫瞬态的最大种群增长率为1.96天⁻¹ ，而在稳态下，最大种群增长率（1.09天⁻¹ ）与Fussmann预测的霍普夫分岔点相似，在藻类浓度为1×10⁶ 个细胞/毫升时观察到。在瞬态中，藻类浓度较高时轮虫的生长速率增加且繁殖时间减少，直至达到一个峰值，此时种群增长率开始下降。在稳态下情况相反。本研究中观察到的生长速率是该轮虫在连续培养中记录到的最高值之一。
