Role of Anaerobic Ciliates in Planktonic Food Webs: Abundance, Feeding, and Impact on Bacteria in the Field
Role of Anaerobic Ciliates in Planktonic Food Webs: Abundance, Feeding, and Impact on Bacteria in the Field
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DOI：
10.1128/aem.60.4.1325-1334.1994
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发表时间：
1994-04
影响因子：
4.4
通讯作者：
R. Massana;C. Pedrós-Alió
中科院分区：
文献类型：
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作者：
R. Massana;C. Pedrós-Alió
我们研究了两个厌氧纤毛虫 Plagiopyla sp. 种群的动态。和 Metopus sp. 及其潜在猎物，异养和光养紫色细菌，在西索湖的整个一年周期中。两种纤毛虫的丰度都非常低（每毫升少于 2 条）。在混合过程中，Plagiopyla 纤毛虫表现出高清除率（约 100 nl ciliate-1 h-1），其综合丰度随着 47 天的净倍增时间而增加，其潜在倍增时间（根据消耗的细菌数量计算）在 5 至 8 天之间。分层过程中，斜壁纤毛虫的活动减弱，种群数量减少；这与存在的硫化物含量较高有关。研究发现，Plagiopyla 种群的捕食对浮游细菌的影响微不足道，每天消耗的细菌生物量不到 0.1%。因此，厌氧纤毛虫无法控制西索湖中的浮游细菌，因为研究期间的丰度较低，而且某些时期的摄食率较低。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。
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-1 h-1), 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.