基于高通量测序的冬季太湖竺山湾浮游细菌和沉积物细菌群落结构和多样性研究
Journal of Ecology and Rural Environment(2017)
Abstract
为了探究太湖竺山湾浮游细菌及沉积物细菌群落的结构及多样性变化,考察细菌与环境因子之间的生态耦合关系,基于16S rRNA基因的高通量测序技术,研究冬季太湖竺山湾的浮游细菌和沉积物细菌群落结构和多样性,对相对丰度排名居前10位的优势浮游细菌属与pH值、溶解氧浓度、叶绿素a浓度、藻密度、总氮浓度和总磷浓度等环境因子进行冗余分析.结果表明,从门水平来看,水样和沉积物中蓝藻细菌门(Cyanobacteria)平均相对丰度均较高,分别为46.95%和22.19%;从纲水平来看,水样中的优势细菌主要为未分类的放线菌纲(unidentified Actinobacteria)和未分类的蓝藻细菌纲(unidentified Cyanobacteria),相对丰度分别为31.87%和30.46%,而沉积物中则主要为Chloroplast(14.34%)、γ-变形菌纲(Gammaproteobacteria,10.97%)和硝化螺旋菌纲(Nitrospira,9.89%);从属水平来看,水样中微囊藻属(Microcystis)占优势,其次为hgcI clade,沉积物中微囊藻属和未分类的硝化螺旋菌属(unidentified Nitrospiraceae)占优势.通过研究发现水体中微囊藻属相对丰度最高,且与藻密度、溶解氧浓度和pH值呈正相关.
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Key words
Micro-cystis,Zhushan Bay,environmental factor,Lake Taihu,bacterial community,high-throughput sequencing
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