Macro-invertebrates Community Structure and Its Relationship with Environmental Factors in Shanxi Hydroproject
To probe into the community structure of macro-invertebrates of the reservoir water bodies of the Shanxi Hydro-project in Wenzhou City of southeast China,and its responsive relationship with the environmental factors,water quality moni-toring and macro-invertebrates sampling survey were carried out in the dry season of January 2022 and the wet season of July 2022,and 18 sampling sites were selected covering the entire water bodies of Shanxi Reservoir and Zhaoshandu Reservoir.During the survey a total of 26 species of macro-invertebrates were collected in the reservoir area,which belonged to 3 phyla,6 classes,7 orders and 8 families,the dominant species throughout the year being mainly Branchiura sowerbyi,Limnodrilus hoffmeisteri and Procladius sp.,and the macro-invertebrates did not show notable difference about abundance and diversity in the period of dry season-wet season,but the PCoA the Adonis paired test analyses suggested that their community structure varied significantly;the SIMPER analysis showed that the major contributors to the differences in community structure among the regions of Shanxi Hydroproject reservoirs in dry season were four species of Tubificidae,Chironomidae and Viviparidae,and in wet season are five species of Tubificidae and Chironomidae.The results of redundancy analysis(RDA)showed that the environmental factors affecting the macro-invertebrates community structure of the Shanxi Hydroproject reservoirs in dry sea-son were water depth(H),total nitrogen(TN)and orthophosphate(PO43-),and in wet season being transparency(SD)and am-monia nitrogen(NH4+-N).Consequently,Shanxi Reservoir is a typical deep-water reservoir,and the dominant populations are dominated by Tubificidae and Chironomidae,being under the influences of water depth and reservoir scheduling;Zhaoshandu Reservoir being affected by the pollutant confluence from the inflowing tributeries,is characterized with a relatively high trophic state and rather good species diversity.The spatial differences of macro-invertebrates community structure in the reservoirs are remarkable,and are affected by environmental factors considerably.Summarily,the achievements of this research will not only enrich the study on typical valley-type reservoirs particularly in southeastern China,but also assist the further investigation of macro-invertebrates in Shanxi Hydroproject,providing the scientific basis for the ecological protection of the reservoirs and the construction of beautiful rivers and lakes in Wenzhou.
万方数据
维普
