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河口细菌群落多样性及其控制因素:以切萨皮克湾为例 被引量:8

Bacterial community biodiversity in estuaries and its controlling factors: a case study in Chesapeake Bay
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摘要 咸淡水的混合和重要营养盐与有机物的再循环,使得河口成为地球上生产力较高而动态变化明显的水生生态系统。一个典型的河口区断面中,细菌群落包含了一些从淡水到海洋的过渡类型:例如a-变形菌(Alphaproteobacteria)、-变形菌(Betaproteobacteria)、?-变形菌(Gammaproteobacteria)、蓝细菌(Cyanobacteria)[聚球藻(Synechococcus)]、拟杆菌(Bacteroidetes)、放线细菌(Actinobacteria)和疣微菌(Verrucomicrobia)等。此外,河口也包含其独特的细菌群落:SAR11组、玫瑰杆菌属(Roseobacter)、SAR86和放线细菌(Actinobacteria)的一些进化亚枝(subclades),表明海湾或者大型温带河口区细菌类群具有区域生态适应性。以研究较多的美国切萨皮克湾(Chesapeake Bay)为例,其细菌群落呈现出显著的季节性变化和周期性的年际变化特征;这些变化除了受水的滞留时间和细菌生长速度影响外,还可能受其他许多环境因子的影响。其中叶绿素a和水温变化的影响最大,其他环境因子如溶解氧、铵态氮、亚硝酸盐和硝酸盐以及病毒的丰度也有影响。近年来,基于群落水平的基因组学(genomics)和后基因组学(postgenomics)(转录组学和蛋白质组学)技术应用于研究自然条件下微生物群落错综复杂的基因多样性和表达,提供了揭示水环境中微生物群落组成和新功能基因的途径。 Estuaries are among the most productive and dynamic aquatic ecosystems on earth,due to the mixing of fresh and salt waters and significant recycling of nutrients and organic matters.Sitting in a transi-tional zone,bacterial communities in an estuary typically harbor representatives of both freshwater and ma-rine groups: Alphaproteobacteria,Betaproteobacteria,Gammaproteobacteria,Cyanobacteria(Synechococ-cus),Bacteroidetes,Actinobacteria,and Verrucomicrobia.In addition,estuaries such as Chesapeake Bay also contain their own unique bacterial signatures including the SAR11 group,Roseobacter,SAR86,and Actino-bacteria subclades,suggesting the ecological adaptation of organisms endemic to the Bay or perhaps,to large temperate estuaries in general.Relative to spatial variations,remarkable seasonal shifts and recurring annual patterns were identified in Chesapeake Bay bacterial communities.Besides water residence time and bacte-rial growth rate,many other factors are potential driving forces for the microbial diversity and bacterial population dynamics we observed.Temporal variations in bacterial communities were best explained by change in chlorophyll a(Chl a) and water temperature,while other factors such as dissolved oxygen,ammo-nia,nitrite and nitrate,and viral abundance also appeared to contribute to seasonal succession.Recently,the applications of community-based genomics and postgenomics(transcriptomics and proteomics) have allowed us to study the comprehensive gene diversity and gene expression directly from natural microbial communi-ties.We predict that further studies and analyses of these genes and proteins will deliver new discoveries re-garding the composition and function of microbial communities in aquatic environments.
作者 阚金军 孙军
出处 《生物多样性》 CAS CSCD 北大核心 2011年第6期770-778,共9页 Biodiversity Science
基金 美国自然科学基金(NSF)Microbial Observatory(MCB-0132070 MCB-0537041) Long Term Research in Environmental Biology(LTREB)(1052716) Meta-Ecosystems and the Upstream Legacy(1120717) 海洋公益项目(201005015-1)
关键词 遗传多样性 浮游细菌 基因组学 后基因组学 切萨皮克湾 genetic diversity bacterioplankton genomic postgenomics Chesapeake Bay
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