Fish Molecular Biology Lab, Department of Zoology, University of Delhi, Delhi 110 007, India.
Department of Botany, University of Delhi, Delhi 110 007, India.
Eur J Protistol. 2021 Jun;79:125793. doi: 10.1016/j.ejop.2021.125793. Epub 2021 Apr 20.
The River Yamuna emerges from Saptarishi Kund, Yamunotri and merge with River Ganges at Allahabad, India. Anthropogenic stress has affected the water quality of the river Yamuna drastically in the stretch traversing Delhi and its satellite towns (National Capital Region, NCR). In the present study, effect of water quality on the microbial life in the River Yamuna was analyzed using ciliate communities (Protista, Ciliophora) as bio-indicators. Water samples were collected from six sampling sites chosen according to the levels of pollution along the river and water quality was analysed using standard physicochemical factors. As the river traverses Delhi NCR, water quality deteriorates considerably as indicated by the Water Quality Index at the selected sampling sites. Seventy-four ciliate species representing nine classes were recorded. Based on the Shannon diversity index, maximum species diversity was found at the point where the river enters Delhi. The saprobity index showed the river water was beta-mesosaprobic when the river enters Delhi and alpha-mesosaprobic at downstream sites after the first major drain outfall. Significant relationship between the spatial variation in ciliate communities and abiotic parameters indicate that ciliates can be used as effective bioindicators of pollution in the River Yamuna.
恒河发源于萨塔尔希克里水塘、亚穆纳特里，在印度阿拉哈巴德与亚穆纳河汇流。人类活动对恒河雅姆纳河在穿越德里及其卫星城镇（国家首都辖区，NCR）的河段的水质造成了巨大影响。在本研究中，我们使用纤毛虫群落（原生动物，纤毛门）作为生物指标，分析了水质对雅姆纳河微生物生命的影响。根据河流沿岸的污染程度，从六个采样点采集水样，并使用标准理化因子分析水质。由于这条河穿过德里 NCR，水质在选定的采样点明显恶化，水质指数也随之升高。记录了 74 种纤毛虫，代表 9 个纲。根据香农多样性指数，在河流进入德里的地方发现了最大的物种多样性。当河流进入德里时，根据耐污指数，河水为β-中污型，而在第一个主要污水排放口下游的下游站点则为α-中污型。纤毛虫群落与非生物参数的空间变化之间存在显著关系，这表明纤毛虫可以作为雅姆纳河污染的有效生物指标。
