Characteristics of cyanophyte communities in sediments from Caohai lakeside
To monitor the biodiversity and community structure of cyanophyte in Caohai Lake,18 surface sediment samples were collected from the lakeside zone of Caohai,and the biodiversity,community composition and regional differences of cyanophyte were analyzed by using eDNA macrobarcode technology.The results showed that the pro-karyotes from Caohai belonged to 59 phyla,665 families and 1280 genera,and were dominated by the phylum of Proteobacteria.The abundance of cyanophyte in the prokaryotic community ranged from 0.05%to 6.97%,with an average abundance of 0.68%.The average Chao1 index of cyanophyte communities was 14.27.At the family lev-el,the cyanophyte communities were composed of Phormidiaceae,Cyanobiaceae,Oscillatoriaceae,Nodosilineaceae,Nostocaceae,Leptolyngbyaceae,Microcystaceae,Pseudanabaenaceae,Pseudanabaenaceae,and Cyanobacteriaceae.At the genus level,Cyanobium,Planktothrix and Oscillatoria were dominant.The composition of cyanophyte commu-nities was similar between the high disturbance area and the low disturbance area,but there were some differences.Leptolyngbyaceae concentrated in the high disturbance area near Weining County,while Microcystaceae and Syne-chocystis concentrated in the low disturbance area far away from the county.The results showed that the diversity and richness of cyanophyte communities in high disturbance area were higher;the diversity and richness in low dis-turbance area were lower,but the risk of bloom and microsystin was higher.
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