The species diversity of oligochaetes and their spatial distribution have been studied in three lakes of the Naroch system (Belarus) differing in trophic status. The results show that, irrespective of lake trophic status, the abundance, biomass, and species diversity of oligochaetes decrease toward the profundal zone. The species composition of oligochaetes is most diverse in the littoral zone of an oligomesotrophic lake. Dominant species of the subfamily Tubificinae show preferences for certain types of lake biotopes.

中文翻译：

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不同营养状态的 Naroch 系统（白俄罗斯）湖泊中寡毛纲（Annelida：Clitellata：Oligochaeta）的空间分布

研究了 Naroch 系统（白俄罗斯）的三个营养状况不同的湖泊中的寡毛纲物种多样性及其空间分布。结果表明，无论湖泊营养状况如何，寡毛纲的丰度、生物量和物种多样性都向深部下降。寡毛纲动物的物种组成在贫中营养湖的沿岸地区最为多样化。Tubificinae 亚科的优势物种对某些类型的湖泊生物群落表现出偏好。