Community structure and diversity evaluation of aquatic organisms in Zuli River
Macrobenthic animals and fish are the main species for ecological health assessment of river.In view of the status quo of aquatic organisms in Zuli River,which is not clear of the number and unknown the structure of biological community,the composition,density and biomass of macrobenthic animals and fish were analyzed in 5 hydrologic sectional drawing of the main stream and the largest tributary.Shannon-wiener diversity index and BMWP index were used to evaluate the distribution pattern,spatial and temporal characteristics of aquatic biodiversity,and to explore and analyze the correlation between aquatic biodiversity and water quality environment,so as to provide technical support for ecological protection and management of Zuli River.The results showed that 28 genera of macrobenthic invertebrates,belonging to 3 phyla and 3 classes,among which 24 genera of arthropods,accounting for 78.57%of the total species.Arthropod were the dominant species.The number of fish species is small,there are 7 species,all belong to Cypriniformes,Triplophyta steinii is the dominant species.According to the Shannon-wiener diversity index of aquatic organisms,the diversity of macrobenthic invertebrates in Zuli River is medium,the BMWP index is poor,and the fish diversity is poor in general.The macrobenthic invertebrates in both main stream and tributary showed a trend that the upstream was larger than the downstream,and the summer was larger than the autumn.There were more fish in the tributaries of Zuli River than in the main stream.At the same time,the correlation analysis between aquatic biodiversity and water quality environment showed that water temperature,potassium permanganate,ammonia nitrogen,total nitrogen,total phosphorus and dissolved oxygen were the main driving factors affecting the community structure and biodiversity of benthonic animal.The number of fish species was significantly negative correlated with ammonia nitrogen(p>0.05),water temperature was significantly negative correlated with Shannon-wiener diversity index(p>0.05),due to the small number of fish species,the correlation was not significant.
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