Spatial-Temporal Variations of Zooplankton in Relation to Selected Limnological Parameters: A Case of Kisii Town Wastewater Treatment Plant, Kisii County, Kenya

Pan Africa science journal Pub Date : 2023-09-11 DOI:10.47787/pasj.v3i02.23

Douglas Mosoti Rayori, Reuben Omondi, Albert Getabu, Paul Orina, Argwings Omondi

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Abstract

Zooplankton have been used as bioindicators of water quality. In this study, we assessed the spatial-temporal variations of zooplankton in the Kisii town wastewater treatment plant and how they were influenced by limnological parameters between May and August 2021. Triplicate zooplankton samples were collected monthly for laboratory analysis. Physical parameters were measured in situ using a YSI multi-parameter probe while triplicate wastewater samples were collected for chemical parameters analyses ex situ. Eleven (11) zooplankton species were identified belonging to three groups. Cladocera was represented by 5 species (45.5 %), Rotifera by 4 species (36.4 %), and Copepoda by 2 species (18.2 %). The total zooplankton density recorded was 515IndL-1 with the family Cladocera dominating (57.7 %) followed by Copepoda (22.8 %) then Rotifera (19.5 %) with the least number in the population density. The limnological parameters measurements indicate considerable wastewater pollutant removal during polishing but negatively influenced zooplankton diversity. Therefore, zooplankton can be used to monitor wastewater treatment progress.

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浮游动物与选定湖泊参数的时空变化——以肯尼亚基思县基思镇污水处理厂为例

浮游动物已被用作水质的生物指标。本研究对2021年5 - 8月基思镇污水处理厂浮游动物的时空变化及其受湖泊参数的影响进行了研究。每月收集三份浮游动物样本供实验室分析。使用YSI多参数探针原位测量物理参数，同时收集三份废水样品进行非原位化学参数分析。共鉴定出11种浮游动物，分属3个类群。枝角目5种(45.5%)，轮虫目4种(36.4%)，桡足目2种(18.2%)。记录的浮游动物总密度为515IndL-1，以枝角目为主(57.7%)，其次是桡足目(22.8%)和轮虫目(19.5%)，种群密度最少。湖沼参数测量表明，抛光过程中去除了大量的废水污染物，但对浮游动物多样性产生了负面影响。因此，浮游动物可以用来监测废水处理的进展。

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Pan Africa science journal

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