Journal article
Microbial mercury methylation in Antarctic sea ice
CM Gionfriddo, MT Tate, RR Wick, MB Schultz, A Zemla, MP Thelen, R Schofield, DP Krabbenhoft, KE Holt, JW Moreau
Nature Microbiology | NATURE PORTFOLIO | Published : 2016
Abstract
Atmospheric deposition of mercury onto sea ice and circumpolar sea water provides mercury for microbial methylation, and contributes to the bioaccumulation of the potent neurotoxin methylmercury in the marine food web. Little is known about the abiotic and biotic controls on microbial mercury methylation in polar marine systems. However, mercury methylation is known to occur alongside photochemical and microbial mercury reduction and subsequent volatilization. Here, we combine mercury speciation measurements of total and methylated mercury with metagenomic analysis of whole-community microbial DNA from Antarctic snow, brine, sea ice and sea water to elucidate potential microbially mediated m..
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Grants
Awarded by Australian Antarctic Division
Awarded by University of Melbourne Joyce Lambert Antarctic Research Seed Funding Grant
Funding Acknowledgements
The authors acknowledge funding support from the Australian Antarctic Division (AAD4032, awarded to R.S., J.W.M., M.T.T. and D.P.K.) and The University of Melbourne Joyce Lambert Antarctic Research Seed Funding Grant (no. 501325, awarded to M.B.S., K.E.H. and J.W.M.). The authors thank K. Meiners for contributions to the sea ice chemistry data and shipboard logistical support as the Chief Scientist of SIPEX II; A. Klekociuk (Australian Antarctic Division, Co-Investigator on AAD4032) for shipboard logistical support; D. Lannuzel and A. Bowie (University of Tasmania) for making trace metal data available and for shipboard sampling and logistical support; K. Westwood at the Australian Antarctic Division for assistance in the biology laboratory and contributions to water chemistry data; and A. Martin, S. Ugalde, F. Chever, C. Schallenberg and J. Janssens (SIPEX II Science Party) for logistical assistance on the ice. The authors also thank J. Banfield and B. Thomas (University of California-Berkeley) for help with ggKbase. The authors thank J. Santillan and C. Gilmour (Smithsonian Environmental Research Center) for their constructive review that helped to improve this manuscript.