Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas, Passeig Joan de Borbó s/n, E-08039 Barcelona, Spain.
Appl Environ Microbiol. 1994 Apr;60(4):1325-34. doi: 10.1128/aem.60.4.1325-1334.1994.
We studied the dynamics of two populations of anaerobic ciliates, Plagiopyla sp. and Metopus sp., and of their potential prey, heterotrophic and phototrophic purple bacteria, in Lake Cisó throughout a 1-year cycle. The abundance of both ciliates was very low (less than 2 individuals per ml). During mixing, Plagiopyla ciliates exhibited high clearance rates (about 100 nl ciliate h), its integrated abundance increased with a net doubling time of 47 days, and its potential doubling times, as calculated from the number of bacteria consumed, ranged between 5 and 8 days. During stratification, the activity of Plagiopyla ciliates was reduced and the population decreased; this was related to the higher amounts of sulfide present. The impact of predation by the Plagiopyla population on bacterioplankton was found to be insignificant, less than 0.1% of bacterial biomass consumed per day. Thus, anaerobic ciliates cannot control the bacterioplankton in Lake Cisó because of both the low abundance over the period studied and the low feeding rates during certain periods. A review of available field studies suggests that this conclusion can be extrapolated to most other anoxic systems.
我们在整个 1 年周期内研究了两个厌氧纤毛虫种群（Plagiopyla sp. 和 Metopus sp.）及其潜在猎物——异养和光合紫色细菌在 Cisó 湖中的动态。两种纤毛虫的丰度都非常低（每毫升不到 2 个个体）。在混合过程中，Plagiopyla 纤毛虫表现出很高的清除率（约 100nl 纤毛虫 h），其综合丰度随净倍增时间 47 天而增加，根据消耗的细菌数量计算出的潜在倍增时间在 5 到 8 天之间。在分层过程中，Plagiopyla 纤毛虫的活性降低，种群数量减少；这与存在的较高量的硫化物有关。发现 Plagiopyla 种群的捕食对细菌浮游生物的影响微不足道，每天消耗的细菌生物量不到 0.1%。因此，由于在研究期间的低丰度和某些时期的低摄食率，厌氧纤毛虫无法控制 Cisó 湖中的细菌浮游生物。对现有现场研究的回顾表明，这一结论可以推断到大多数其他缺氧系统。
