Department of Zoology, University of Toronto, M5S 1A1, Toronto, Ontario.
Microb Ecol. 1977 Sep;4(3):207-14. doi: 10.1007/BF02015077.
The growth rate or numerical response of five species of bactivorous ciliates to the abundance ofEnterobacter aerogenes was examined in monoxenic culture. The ciliatesColpidium campylum, C. colpoda, Glaucoma scintillons, G. frontata, andCyclidium glaucoma were isolated from a small pond. Four were grown in shaken cultures, while three were grown in cultures in which the bacteria were allowed to settle on the bottom of the culture vessel. Of the seven response curves generated, four had distinct thresholds, so that the Michaelis-Menten model usually fitted to ciliate numerical response curves was not appropriate. In shaken cultures, half-saturation prey densities ranged from 5.5 × 10(6) to 42.9 × 10(6) bacteria/ml. In unshaken cultures, half-saturation densities ranged from 0.057 × 10(6) to 14.6 × 10(6) bacteria/cm(2). Two species grown on both suspended and settled bacteria attained higher growth rates and had lower half-saturation prey densities feeding on settled bacteria.
在单养培养中，研究了五种噬菌纤毛虫对气单胞菌丰度的增长率或数值响应。纤毛虫 Colpidium campylum、C. colpoda、Glaucoma scintillons、G. frontata 和 Cyclidium glaucoma 从小池塘中分离出来。其中四种在摇瓶培养中生长，三种在培养物中允许细菌在培养容器底部沉降。在生成的七个响应曲线中，有四个具有明显的阈值，因此通常适用于纤毛虫数值响应曲线的米氏-门捷列夫模型并不适用。在摇瓶培养中，半饱和猎物密度范围从 5.5×10(6)到 42.9×10(6)个细菌/ml。在未摇瓶培养中，半饱和密度范围从 0.057×10(6)到 14.6×10(6)个细菌/cm(2)。在悬浮和沉降细菌上均生长的两种物种具有更高的生长速率和更低的半饱和猎物密度，可在沉降细菌上进食。
