DOI: 10.1111/gbi.12283
Scopus记录号: 2-s2.0-85045393824
论文题名: Microbial diversity and biomarker analysis of modern freshwater microbialites from Laguna Bacalar, Mexico
作者: Johnson D.B. ; Beddows P.A. ; Flynn T.M. ; Osburn M.R.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期: 3 起始页码: 319
结束页码: 337
语种: 英语
英文关键词: Laguna Bacalar
; lipid biomarkers
; microbialites
; sulfate reducing bacteria
Scopus关键词: abundance
; biogeochemical cycle
; biomarker
; cyanobacterium
; freshwater environment
; lacustrine environment
; lipid
; mangrove
; microbial activity
; microbial community
; microbialite
; phylogenetics
; precipitation (chemistry)
; species diversity
; sulfate-reducing bacterium
; British Columbia
; Canada
; Laguna Bacalar
; Mexico [North America]
; Pavilion Lake
; Quintana Roo
; Yucatan Peninsula
; Alphaproteobacteria
; Cyanobacteria
; Deltaproteobacteria
; Gammaproteobacteria
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Laguna Bacalar is a sulfate-rich freshwater lake on the Yucatan Peninsula that hosts large microbialites. High sulfate concentrations distinguish Laguna Bacalar from other freshwater microbialite sites such as Pavilion Lake and Alchichica, Mexico, as well as from other aqueous features on the Yucatan Peninsula. While cyanobacterial populations have been described here previously, this study offers a more complete characterization of the microbial populations and corresponding biogeochemical cycling using a three-pronged geobiological approach of microscopy, high-throughput DNA sequencing, and lipid biomarker analyses. We identify and compare diverse microbial communities of Alphaproteobacteria, Deltaproteobacteria, and Gammaproteobacteria that vary with location along a bank-to-bank transect across the lake, within microbialites, and within a neighboring mangrove root agglomeration. In particular, sulfate-reducing bacteria are extremely common and diverse, constituting 7%–19% of phylogenetic diversity within the microbialites, and are hypothesized to significantly influence carbonate precipitation. In contrast, Cyanobacteria account for less than 1% of phylogenetic diversity. The distribution of lipid biomarkers reflects these changes in microbial ecology, providing meaningful biosignatures for the microbes in this system. Polysaturated short-chain fatty acids characteristic of cyanobacteria account for <3% of total abundance in Laguna Bacalar microbialites. By contrast, even short-chain and monounsaturated short-chain fatty acids attributable to both Cyanobacteria and many other organisms including types of Alphaproteobacteria and Gammaproteobacteria constitute 43%–69% and 17%–25%, respectively, of total abundance in microbialites. While cyanobacteria are the largest and most visible microbes within these microbialites and dominate the mangrove root agglomeration, it is clear that their smaller, metabolically diverse associates are responsible for significant biogeochemical cycling in this microbialite system. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85010
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL, United States; Biosciences Division, Argonne National Laboratory, Argonne, IL, United States
Recommended Citation:
Johnson D.B.,Beddows P.A.,Flynn T.M.,et al. Microbial diversity and biomarker analysis of modern freshwater microbialites from Laguna Bacalar, Mexico[J]. Geobiology,2018-01-01,16(3)