PMID: 18186335Jan 12, 2008Paper

Size and density distribution of sulfide-producing microniches in lake sediments

Environmental Science & Technology
Anders Widerlund, William Davison

Abstract

The technique of diffusive gradients in thin films (DGT) with measurements by computer-imaging densitometry (CID) was used to study the in situ, two-dimensional distribution of sulfide-producing microniches in sediments from a eutrophic lake (Esthwaite Water, UK). The DGT-CID technique precipitates and immobilizes the net pore-water flux of dissolved sulfide as black Ag2S by reaction with a AgI binding gel. The mass of accumulated sulfide is then determined from a scanned grayscale image of this gel. DGT probes deployed in laboratory mesocosms of homogeneously mixed sediment, then analyzed at high spatial resolution (approximately 0.1 mm), showed that apparent niche areas (operationally defined by DGT-CID) were <1 mm2 for 30% of the niches. In eight DGT probes deployed in undisturbed sediment cores, the proportion of microniche-related sulfide flux was > or =1-8% of the total horizontal net pore-water flux of sulfide. This study suggests that microniches that introduce local redox gradients are common in sediments. As fluxes within these microenvironments can considerably exceed background values, consideration of the dynamics of the biogeochemical processes occurring at these sites is likely to be key to improving our understa...Continue Reading

References

Mar 15, 2003·Environmental Science & Technology·Christopher R DeVries, Feiyue Wang
Oct 24, 2003·Environmental Science & Technology·Mikael Motelica-HeinoWilliam Davison
Jun 7, 2005·The Science of the Total Environment·C NaylorL M Van Der Heijdt
May 1, 1982·Applied and Environmental Microbiology·E SeniorD B Nedwell

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Citations

Jun 14, 2015·Environmental Science and Pollution Research International·Zhihao WuLixin Jiao
Oct 12, 2010·Environmental Toxicology and Chemistry·G Allen Burton, Emma L Johnston
May 24, 2015·Analytica Chimica Acta·Jakob SantnerRonnie N Glud
Jun 28, 2016·Environmental Pollution·Qiyao SunRobert J G Mortimer
Jul 6, 2016·Environmental Pollution·Yulu GaoHans Christian Bruun Hansen
Apr 13, 2010·Journal of Environmental Monitoring : JEM·Anthony StockdaleHao Zhang
Nov 9, 2019·Environmental Science and Pollution Research International·Zhihao WuNingning Ji
Nov 11, 2020·Environmental Science & Technology·Chunyang ZhouWilly Baeyens
Jun 27, 2014·Environmental Science & Technology·Paul N WilliamsHao Zhang

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