Characteristics of Periphytic Algae Communities in Wuli Lake,Lake Taihu
A monthly monitoring program of periphytic algae was conducted on Wuli Lake in Wuxi City from May 2009 to June 2010.Based on the investigations,periphytic algae species composition,biomass,tempo?ral distribution and community structure were analyzed with Pielou uniformity index,Mcnaughton predominance index and Shannon?Wiener diversity index.The results showed that there were 5 classes including 43 species of periphytic algae in Wuli Lake.Among them, Bacillariophyta was the predominant phylum,which had 24 spe?cies,accounting for 55. 81% of the total species. Chlorophyta was recorded 16 species, which accounted for 37.21% of the total species.1,3 species of Cyanophyta and Cryptophyta were recorded respectively,1 species of Euglenophyta was recorded,which accounted for 2. 33%. There were 20 species of periphytic algae being the dominant species in Wuli Lake;Bacillariophyta was the dominant class in Wuli Lake.The biomass of periphytic algae in Wuli Lake ranged from 0.88×104 ind./cm2 to 2.73×104 ind./cm2,its annual mean was 1.95×104 ind./cm2.The community structure and amounts of the periphytic algae varied seasonally.The species and amounts of periphytic algae were the largest in summer and the smallest in winter.Periphytic algae varied spatially both in terms of taxonomic composition and abundance. The taxonomic amounts of periphytic algae in sludge areas of algae were more than in other bottom sediment areas.The Shannon?Wiener diversity index ranged from 2.12 to 2.94,the mean value was 2.50,the Pielou uniformity index ranged from 0.76 to 0.88,the mean value was 0.85. In conclusion,the periphytic algae community structure was in a complex,integrated state in Wuli Lake.
periphytonassemblage characteristicsspatial and temporal variationWuli lake
国家科技期刊平台
NSTL
万方数据
维普
