Selection of benthic macroinvertebrate-based multimetrics and preliminary establishment of biocriteria for the bioassessment of the water quality of Taihu Lake, China |
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Authors: | Ma Taowu Huang Qinghui Wang Hai Wang Zijian Wang Chunxia and Huang Shengbiao |
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Institution: | 1. College of Biology and Environmental Science, Jishou University, Jishou 416000, China;2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Evironmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;3. Key Laboratory of Yangtze Water Environment of Ministry of Education of China, College of Environmental Science and Engineering, Tongji University, Shanghai 20009, China |
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Abstract: | To develop benthic macroinvertebrate-based multimetrics for the bioassessment of the water quality of Taihu Lake, benthic macroinvertebrate assemblages were sampled at 60 sites in 8 subareas of Taihu Lake. A total of 24 species of benthic macroinvertebrates were obtained: 14 species of Mollusca, 5 species of Arthropoda and 5 species of Annelida. A comprehensive evaluation of the metrics was carried out. The results showed that 7 metrics (i.e., total number of taxa, the number of Mollusca &; Crustacea taxa, % Mollusca &; Crustacea, % Gastropoda, Goodnight-Whitley index, Hilsenhoff biotic index and % Collector-gatherers) were sensitive. A score of 5, 3 or 1 was assigned to every metric for standardization of the metrics, and a multimetric on a scale ranging from 7 to 35 for bioassessment was developed. Four-level discriminatory biocriteria for water quality were eventually proposed by quartation: 7–14, very poor; 15–21, poor; 22–28, fair; 29–35, good. The re-scored results from the 60 sites showed that the water quality of southeastern Taihu Lake was relatively good, whereas that of northwestern Taihu Lake was relatively poor. Basically, the discriminatory biocriteria are suitable for the assessment of the water quality of Taihu Lake. |
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Keywords: | benthic macroinvertebrate metrics bioassessment of water quality scoring criteria biocriteria Taihu Lake |
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