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Microbial diversity and potential for arsenic and iron biogeochemical cycling at an arsenic rich, shallow-sea hydrothermal vent (Tutum Bay, Papua New Guinea)

Meyer-Dombard, D'Arcy R. and Amend, Jan P. and Osburn, Magdalena R. (2013) Microbial diversity and potential for arsenic and iron biogeochemical cycling at an arsenic rich, shallow-sea hydrothermal vent (Tutum Bay, Papua New Guinea). Chemical Geology, 348 . pp. 37-47. ISSN 0009-2541. https://resolver.caltech.edu/CaltechAUTHORS:20130812-100050037

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Abstract

The shallow submarine hydrothermal systems of Tutum Bay, Papua New Guinea, are an ideal opportunity to study the influence of arsenic on a marine ecosystem. Previous reports have demonstrated that the hydrothermal vents in Tutum Bay release arsenic in reduced hydrothermal fluids into the marine environment at the rate of 1.5 kg of arsenic/day. Aqueous arsenite is oxidized and adsorbed onto hydrous ferric oxides [HFOs] surrounding the venting area. We demonstrate here that microorganisms are key in both the oxidation of Fe^(II) and As^(III) in the areas immediately surrounding the vent source. Surveys of community diversity in biofilms and in vent fluid indicate the presence of zeta-Proteobacteria, alpha-Proteobacteria, Persephonella, and close relatives of the archaeon Nitrosocaldus. The iron oxidizing zeta-Proteobacteria are among the first colonizers of solid substrates near the vents, where they appear to be involved in the precipitation of the hydrous ferric oxides (HFOs). Further, the biofilm communities possess the genetic capacity for the oxidation of arsenite. The resulting arsenate is adsorbed onto the HFOs, potentially removing the arsenic from the immediate marine system. No evidence was found for dissimilatory arsenate reduction, but the arsenate may be remobilized by detoxification mechanisms. This is the first demonstration of the genetic capacity for arsenic cycling in high temperature, shallow-sea vent communities, supporting recent culture-based findings in similar systems in Greece (Handley et al., 2010). These reports extend the deep-sea habitat of the zeta-Proteobacteria to shallow submarine hydrothermal systems, and together implicate biological oxidation of both iron and arsenite as primary biogeochemical processes in these systems, providing a mechanism for the partial removal of aqueous arsenic from the marine environment surrounding the vents.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.chemgeo.2012.02.024 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0009254112001167PublisherArticle
Additional Information:© 2012 Elsevier B.V. Accepted 27 February 2012; Available online 5 March 2012. This work was partially funded by grants from the National Science Foundation (NSF-EAR-0221834 and NSF-EAR-0447231) to JPA, and by internal funding from the University of Illinois to DRMD. We thank N. Akerman for insightful discussions.
Funders:
Funding AgencyGrant Number
NSFEAR-0221834
NSFEAR-0447231
University of Illinois UNSPECIFIED
Subject Keywords:Arsenic biogeochemistry; Iron biogeochemistly; Shallow-sea hydrothermal vents; Biofilms
Record Number:CaltechAUTHORS:20130812-100050037
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130812-100050037
Official Citation:D'Arcy R. Meyer-Dombard, Jan P. Amend, Magdalena R. Osburn, Microbial diversity and potential for arsenic and iron biogeochemical cycling at an arsenic rich, shallow-sea hydrothermal vent (Tutum Bay, Papua New Guinea), Chemical Geology, Volume 348, 19 June 2013, Pages 37-47, ISSN 0009-2541, http://dx.doi.org/10.1016/j.chemgeo.2012.02.024.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39868
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Aug 2013 20:45
Last Modified:03 Oct 2019 05:11

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