Abstract
To evaluate the ecosystem health of Qin River, a main tributary of the Yellow River, a planktonic index of biotic integrity (P-IBI) that includes phytoplankton and zooplankton was established based on five metrics using a dataset covering 61 sampling sites in Qin River and its largest tributary the Dan River from October to November 2020. First, an index based on land use pattern and water quality was constructed to select reference sites and impaired sites. Then, five of an initial 38 candidate metrics (phytoplankton density, Palmer algal genus pollution index, zooplankton biomass/phytoplankton biomass, zooplankton Margalef richness index, and zooplankton Simpson diversity index) were selected to establish P-IBI based on their ranges, sensitivity, and redundancy. Finally, five statuses (excellent, good, fair, poor, and very poor) were classified by ratio score method on the basis of their final P-IBI scores. Sites with “excellent and good” and “poor and very poor” status accounted for 26.2% and 49.2%, respectively. “Very poor” sites were mainly located in the Dan River, and “poor” sites were mainly located in the middle reach of the Qin River and upper-middle reach of the Dan River in Jincheng region. Significantly negative correlations between Cl−, SO42−, and F− concentrations and P-IBI values indicated that the P-IBI might reflect domestic and industrial wastewater pollution in the Qin and Dan River in Jincheng region. The P-IBI strongly differentiated reference and impaired sites, suggesting the suitability of the index in the study.
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Acknowledgements
The authors thank their colleagues at the Dalian Ocean University for help with the identification of plankton as well as data analysis.
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This study was supported by the National Natural Science Foundation of China (U1704241) and the Key Project of Research of Henan province in China (grant number 19A170006).
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Yanli Li conceived the study and drafted this manuscript. Linxia Li analyzed the hydrochemical compositions and investigated the plankton communities in Qin River in Jincheng region. Data collection and analysis were performed by Linxia Li. All authors read and approved the final manuscript.
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Li, Y., Li, L. Development and validation of the planktonic index of biotic integrity (P-IBI) for Qin River, a main tributary of the Yellow River in China. Environ Sci Pollut Res 30, 2622–2636 (2023). https://doi.org/10.1007/s11356-022-22348-7
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DOI: https://doi.org/10.1007/s11356-022-22348-7