Interactions Between Zn and Bacteria in Marine Tropical Coastal Sediments

Overview

Journal Environ Sci Pollut Res Int

Publisher Springer

Specialties Environmental Health
Toxicology

Date 2011 Sep 29

PMID 21953181

Citations 2

Authors

Olivier Pringault

Helena Viret

Robert Duran

Affiliations

Soon will be listed here.

Abstract

Purpose: The main goals of this study were (1) to examine the effects of zinc on the microbial community structure of anthropogenically impacted sediments in a tropical coastal ecosystem and (2) to determine whether these microbial benthic communities may enhance the adsorption of zinc.

Methods: The interactions between zinc and bacteria in tropical sediments were studied in sediment microcosms amended with 2.5 mg L⁻¹ of Zn in the water phase and incubated for 8 days under different environmental conditions, oxic/anoxic and glucose addition. At the end of incubation, microbial structure was assessed by molecular fingerprints (T-RFLP) analysis and Zn speciation in the sediment was determined by sequential extraction.

Results: In the three studied sediments, Zn spiking resulted in only slight changes in bacterial community structure. In contrast, the addition of low concentrations of glucose (5 mM) strongly modified the bacterial community structure: <20% of similarity with the initial structure concomitant with a strong diminution of the specific richness. Overall, these results suggest that highly labile organic matter has a larger impact on microbial structure than heavy metal. These weak impacts of Zn on bacteria diversity might be partly explained by (1) the strong adsorption of Zn in the presence of bacteria and/or (2) the incorporation of Zn into a nonbioavailable fraction. Nevertheless, Zn spiking resulted in significant changes in nutrient cycles, suggesting that bacterial metabolisms were impacted by the heavy metal. This led to an increase in nutrient supplies to the water column, potentially enhancing eutrophication in a nutrient-limited, oligotrophic ecosystem.

Citing Articles

Changes in Bacterioplankton Communities Resulting From Direct and Indirect Interactions With Trace Metal Gradients in an Urbanized Marine Coastal Area.

Coclet C, Garnier C, Durrieu G, Omanovic D, DOnofrio S, Le Poupon C Front Microbiol. 2019; 10:257.

PMID: 30853948 PMC: 6395402. DOI: 10.3389/fmicb.2019.00257.

A comparative analysis of endophytic bacterial communities associated with hyperaccumulators growing in mine soils.

Chen L, Luo S, Chen J, Wan Y, Li X, Liu C Environ Sci Pollut Res Int. 2014; 21(12):7538-47.

PMID: 24595752 DOI: 10.1007/s11356-014-2670-9.

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