Evaluations of water quality based on Chironomidae community in the Dongyu River,Shandong Province,China
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Abstract:
As the longest river discharging into the Nansi Lake,the Dongyu River plays an important role on the water quality of the Nansi Lake.To better understand the relationship between the community structure of chironomid and eutrophication of the Dongyu River,the head shells of larvae preserved in the upper 2cm thick loose bottom sediments were investigated with eight samples collected in May 2013.A total of 30 Chironomus species were identified in the Dongyu River surface sediments.The main genus were composed of Glyptotendipes pallens type (20-42%), Cricotopus sylvestris type (18-23%), Chironomus plumosus type (15-24%),Tanytarsus mendax type (7-35%), Dicrotendipes nervosus type (7-12%), Chironomus anthracinus type (6-23%),and Polypedilum nubifer type (5-38%),accounting for 79-97% of the total counts.Based on the biodiversity index and principal component of the Dongyu River,the water body was in a mild to moderate pollution level.Redundancy analysis showed that NH3-N was the main water environmental factor resulting in the distribution of the chironomid in the Dongyu River,and the responses of different species of Chironomid to NH3-N were varied. It can also be inferred that the Dongyu River is a medium eutrophic river, according to the ecological characteristics of the chironomid combination,with serious pollution in the middle and lower reaches,which are the key areas for water pollution control.
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