Application of Benthic Fauna Monitoring in Assessment of Water Quality of the Yanghe Reservoir
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Abstract:
In order to investigate the distribution of benthic fauna in the Yanghe Reservoir and its effects on water quality, 24 samples were collected at six sites in May, August, September, and November 2006. The results showed that (1) eleven species of benthic fauna are observed, among which ten species are capable of pollution indication, and the pollution-resistance species are dominant; (2) the density of benthic fauna at the six sampling?sites are from 680 to 5 920 ind/m2, whereas the average density in the whole reservoir is 1 924 ind/m2, indicating that the reservoir is moderate tropic to eutrophic; (3) the average biomass of benthic?fauna at the six sampling?site is between 1.68 and 38.76 g/m2 whereas the average biomass density in the whole reservoir is 8.53 g/m2; and (4) the biodiversity index of benthic fauna in the reservoir is between 0.64 and 1.89, and the pollution level of the reservoir is between moderate pollution and heavy pollution. Due to its importance in assessment of water quality, the benthic fauna in the reservoir need to be investigated every 5 to 10 years.
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