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Article

Development of a Periphytic Diatom-Based Comprehensive Diatom Index for Assessing the Trophic Status of Lakes in the Lower Reaches of the Yangtze River, China

1
Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
2
College of Life Sciences, Shanghai Normal University, Shanghai 200235, China
*
Authors to whom correspondence should be addressed.
Academic Editor: George Arhonditsis
Water 2021, 13(24), 3570; https://doi.org/10.3390/w13243570
Received: 20 October 2021 / Revised: 7 December 2021 / Accepted: 10 December 2021 / Published: 13 December 2021
(This article belongs to the Section Water Quality and Contamination)
Periphytic diatoms play important functional roles in aquatic ecosystems. Their community compositions are widely used in water quality monitoring due to their wide distribution, short reproductive cycles, and sensitivity to environmental changes. In this study, 116 samples of periphytic diatom samples were collected from lakes in the lower reaches of the Yangtze River. The weighted average without tolerance down-weighting regression method was used to develop total phosphorus (r2 = 0.661), total nitrogen (r2 = 0.699), and chemical oxygen demand (r2 = 0.423) models, and the optimal and tolerance values of 78 periphytic species were calculated. Then, a new index, the comprehensive diatom index (CDI), was established on the basis of the optima and tolerances of these 78 species concerning the three environmental variables (TP, TN, and COD) to assess the water trophic status of the lakes in this region. According to the CDI, the trophic statuses of 8, 17, 23, 30, 22, and 14 sample sites were oligotrophic, mesotrophic, light eutrophication, moderate eutrophication, heavy eutrophication, and ultra-eutrophication, respectively. The CDI was more strongly correlated with the conductivity, pH, TP, TN, COD, and TDS than other diatom indices. These results demonstrate that the CDI is a useful metric for assessing the water trophic status of the lakes in the lower reaches of the Yangtze River. View Full-Text
Keywords: periphytic diatoms; comprehensive diatom index; lakes; optimal and tolerance values; lower reaches of the Yangtze River periphytic diatoms; comprehensive diatom index; lakes; optimal and tolerance values; lower reaches of the Yangtze River
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MDPI and ACS Style

Yu, P.; You, Q.; Pang, W.; Cao, Y.; Bi, Y.; Wang, Q. Development of a Periphytic Diatom-Based Comprehensive Diatom Index for Assessing the Trophic Status of Lakes in the Lower Reaches of the Yangtze River, China. Water 2021, 13, 3570. https://doi.org/10.3390/w13243570

AMA Style

Yu P, You Q, Pang W, Cao Y, Bi Y, Wang Q. Development of a Periphytic Diatom-Based Comprehensive Diatom Index for Assessing the Trophic Status of Lakes in the Lower Reaches of the Yangtze River, China. Water. 2021; 13(24):3570. https://doi.org/10.3390/w13243570

Chicago/Turabian Style

Yu, Pan, Qingmin You, Wanting Pang, Yue Cao, Yonghong Bi, and Quanxi Wang. 2021. "Development of a Periphytic Diatom-Based Comprehensive Diatom Index for Assessing the Trophic Status of Lakes in the Lower Reaches of the Yangtze River, China" Water 13, no. 24: 3570. https://doi.org/10.3390/w13243570

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