Abstract
Water quality and benthic macroinvertebrate samples were collected from two reservoirs in central China from November 2006 to August 2007. Twenty-nine benthic macroinvertebrate taxa were identified, including 10 oligochaetes, 15 aquatic insects and four molluscs. Some of the most common taxa were Aulodrilus pluriseta, Limnodrilus hoffmeisteri, Cryptochironomus sp., Polypedilum sp. and Tokunagayusurika akamusi. Average densities of the macroinvertebrates were similar in both reservoirs (about 300 ind.m−2), whereas there was a large difference in biomass with 430.7 mg.m−2 in Daoguanhe reservoir and 1294.3 mg.m−2 in Jinshahe. Density and biomass of the benthic macroinvertebrates varied over time in both reservoirs with the highest values in November of 2006. Density and biomass also varied spatially. Water temperature, depth, sediment composition and nutrients were correlated with the density of benthic organisms. The biological quality of reservoirs was evaluated with the Shannon diversity, Margalef richnes...
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