NDLI: The Arsenite Oxidation Potential of Native Microbial Communities from Arsenic-Rich Freshwaters

Content Provider	Springer Nature Link
Author	Fazi, Stefa Crognale, Simona Casentini, Barbara Amalfita, Stefa Lotti, Francesca Rossetti, Simona
Copyright Year	2016
Abstract	Microorganisms play an important role in speciation and mobility of arsenic in the environment, by mediating redox transformations of both inorganic and organic species. Since arsenite [As(III)] is more toxic than arsenate [As(V)] to the biota, the microbial driven processes of As(V) reduction and As(III) oxidation may play a prominent role in mediating the environmental impact of arsenic contamination. However, little is known about the ecology and dynamics of As(III)-oxidizing populations within native microbial communities exposed to natural high levels of As. In this study, two techniques for single cell quantification (i.e., flow cytometry, CARD-FISH) were used to analyze the structure of aquatic microbial communities across a gradient of arsenic (As) contamination in different freshwater environments (i.e., groundwaters, surface and thermal waters). Moreover, we followed the structural evolution of these communities and their capacity to oxidize arsenite, when experimentally exposed to high As(III) concentrations in experimental microcosms. Betaproteobacteria and Deltaproteobacteria were the main groups retrieved in groundwaters and surface waters, while Beta and Gammaproteobacteria dominated the bacteria community in thermal waters. At the end of microcosm incubations, the communities were able to oxidize up to 95 % of arsenite, with an increase of Alphaproteobacteria in most of the experimental conditions. Finally, heterotrophic As(III)-oxidizing strains (one Alphaproteobacteria and two Gammaproteobacteria) were isolated from As rich waters. Our findings underlined that native microbial communities from different arsenic-contaminated freshwaters can efficiently perform arsenite oxidation, thus contributing to reduce the overall As toxicity to the aquatic biota.
Starting Page	25
Ending Page	35
Page Count	11
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	72
Issue Number	1
e-ISSN	1432184X
Language	English
Publisher	Springer US
Publisher Date	2016-04-18
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Arsenic Bacteria Groundwaters Geothermal waters Freshwater ecology Microbiology Ecology Microbial Ecology Geoecology/Natural Processes Nature Conservation Water Quality/Water Pollution
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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