Andreote, Ana P. D.
Machineski, Gabriela Silva
Souza, Bruno C. E.
Rezende-Filho, Ary T.
Fiore, Marli F.
Total Authors: 8
 Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba - Brazil
 Univ Groningen, Groningen Inst Evolutionary Life Sci, Microbial Ecol Cluster, Genom Res Ecol & Evolut Nat, Groningen - Netherlands
 Univ Paul Sabatier, CNRS, Inst Rech Dev, Observ Midi Pyrenees, Geosci Environm Toulouse, Toulouse - France
 Univ Fed Mato Grosso do Sul, Fac Engn Architecture & Urbanism & Geog, Campo Grande - Brazil
Total Affiliations: 4
FRONTIERS IN MICROBIOLOGY;
FEB 22 2018.
Web of Science Citations:
Soda lakes have high levels of sodium carbonates and are characterized by salinity and elevated pH. These ecosystems are found across Africa, Europe, Asia, Australia, North, Central, and South America. Particularly in Brazil, the Pantanal region has a series of hundreds of shallow soda lakes (ca. 600) potentially colonized by a diverse haloalkaliphilic microbial community. Biological information of these systems is still elusive, in particular data on the description of the main taxa involved in the biogeochemical cycling of life-important elements. Here, we used metagenomic sequencing to contrast the composition and functional patterns of the microbial communities of two distinct soda lakes from the sub-region Nhecolandia, state of Mato Grosso do Sul, Brazil. These two lakes differ by permanent cyanobacterial blooms (Salina Verde, green-water lake) and by no record of cyanobacterial blooms (Salina Preta, black-water lake). The dominant bacterial species in the Salina Verde bloom was Anabaenopsis elenkinii. This cyanobacterium altered local abiotic parameters such as pH, turbidity, and dissolved oxygen and consequently the overall structure of the microbial community. In Salina Preta, the microbial community had a more structured taxonomic profile. Therefore, the distribution of metabolic functions in Salina Preta community encompassed a large number of taxa, whereas, in Salina Verde, the functional potential was restrained across a specific set of taxa. Distinct signatures in the abundance of genes associated with the cycling of carbon, nitrogen, and sulfur were found. Interestingly, genes linked to arsenic resistance metabolism were present at higher abundance in Salina Verde and they were associated with the cyanobacterial bloom. Collectively, this study advances fundamental knowledge on the composition and genetic potential of microbial communities inhabiting tropical soda lakes. (AU)