Assessment of habitat quality with relation to fish assemblages in an impacted river of the Ganges basin, northern India |
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Authors: | Braj Kishor Gupta Uttam Kumar Sarkar Sanjay Kumar Bhardwaj |
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Institution: | (1) National Bureau of Fish Genetic Resources, Canal Ring Road, P.O. Dilkusha, Lucknow, Uttar Pradesh, 226002, India;(2) Department of Zoology, Chaudhary Charan Singh University, Meerut, Uttar Pradesh, India; |
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Abstract: | In this work, we examined water-quality assessment in relation to fish assemblage of Gomti River, a large tributary of the
Ganges River basin in northern India. Principal component analysis was performed for 18 environmental variables which produced
three axes that cumulatively explained 60.23% of the environmental variation in sites. Fifteen variables (fine substrate fine
gravel, coarse gravel, cobble, sand substrate water flow, conductivity, TDS, total hardness, temperature, dissolved oxygen,
pH, and overhanging vegetation) had high loadings on at least one of the principal component axes interpreted. The canonical
correspondence analysis was used to establish the relationship between important fish species and environmental variables.
Species were distributed within four groups with respect to the significant habitat characteristics. The Pearson correlation
coefficient was calculated between the water-quality parameters. We concluded that the level of species richness is mostly
dependent on abiotic factors like temperature, dissolved oxygen, TDS, conductivity, depth, pH, and water current in the Gomti
River, of the Ganges basin. |
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