Abstract

Studies on zooplankton in the littoral zone of Bahir Dar Gulf of Lake Tana (Ethiopia) carried out in March 2018 have revealed its high qualitative characteristics and species richness (Rotifera (61 species) Copepoda (4), Cladocera (13)). High quantitative characteristics were also recorded. The maximum abundance and biomass of zooplankton were recorded in the sites with hydatophytes (the degree of overgrowing 10–50%). These parameters are significantly lower in the sites with helophytes (the degree of overgrowing up to 100%). It is concluded that the difference between zooplankton communities in the sites with helophytes and in the sites with submerged macrophytes within particular stations is determined by the top-down effect of predators. The Shannon index increases and quantitative parameters of plankton invertebrates decrease with increasing predator press.

中文翻译：

---

旱季结束时塔纳湖（埃塞俄比亚）沿岸带浮游动物的定性组成和数量特征

摘要

2018年3月，在塔纳湖（埃塞俄比亚）巴希尔达尔湾沿海地区的浮游动物研究表明，其高定性特征和物种丰富度（轮虫（61种）Co足类（4），克拉多菌（13））。还记录了高定量特征。在有水生植物的地点记录了浮游动物的最大丰度和生物量（过度生长的程度为10–50％）。这些参数在有植物类植物的地方显着降低（过度生长的程度高达100％）。可以得出结论，特定站点内带藻类植物的地点和被淹没的大型植物的地点之间的浮游动物群落之间的差异取决于捕食者的自上而下效应。