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dc.contributor.authorArce-Rodríguez, Alejandro-
dc.contributor.authorPuente-Sánchez, Fernando-
dc.contributor.authorAvendaño, Roberto-
dc.contributor.authorLibby, Eduardo-
dc.contributor.authorMora-Amador, Raúl-
dc.contributor.authorRojas-Jimenez, Keilor-
dc.contributor.authorMartínez, María-
dc.contributor.authorPieper, Dietmar H.-
dc.contributor.authorChavarría, Max-
dc.identifierdoi: 10.1007/s00248-020-01530-9-
dc.identifierissn: 0095-3628-
dc.identifiere-issn: 1432-184X-
dc.identifier.citationMicrobial Ecology 80: 793-808 (2020)-
dc.description.abstractWe describe the geochemistry and microbial diversity of a pristine environment that resembles an acid rock drainage (ARD) but it is actually the result of hydrothermal and volcanic influences. We designate this environment, and other comparable sites, as volcanic influenced acid rock drainage (VARD) systems. The metal content and sulfuric acid in this ecosystem stem from the volcanic milieu and not from the product of pyrite oxidation. Based on the analysis of 16S rRNA gene amplicons, we report the microbial community structure in the pristine San Cayetano Costa Rican VARD environment (pH = 2.94–3.06, sulfate ~ 0.87–1.19 g L−1, iron ~ 35–61 mg L−1 (waters), and ~ 8–293 g kg−1 (sediments)). San Cayetano was found to be dominated by microorganisms involved in the geochemical cycling of iron, sulfur, and nitrogen; however, the identity and abundance of the species changed with the oxygen content (0.40–6.06 mg L−1) along the river course. The hypoxic source of San Cayetano is dominated by a putative anaerobic sulfate-reducing Deltaproteobacterium. Sulfur-oxidizing bacteria such as Acidithiobacillus or Sulfobacillus are found in smaller proportions with respect to typical ARD. In the oxic downstream, we identified aerobic iron-oxidizers (Leptospirillum, Acidithrix, Ferrovum) and heterotrophic bacteria (Burkholderiaceae bacterium, Trichococcus, Acidocella). Thermoplasmatales archaea closely related to environmental phylotypes found in other ARD niches were also observed throughout the entire ecosystem. Overall, our study shows the differences and similarities in the diversity and distribution of the microbial communities between an ARD and a VARD system at the source and along the oxygen gradient that establishes on the course of the river.-
dc.description.sponsorshipThis work was supported by The Vice-rectory of Research of Universidad de Costa Rica (project number VI 809-B6-524), the Costa Rican Ministry of Science, Technology and Telecommunication (MICITT) and Federal Ministry of Education and Research (BMBF) (project VolcanZyme contract No FI-255B-17), and the ERC grant IPBSL (ERC250350-IPBSL). MM acknowledges government funding from the Transitorio I of the National Law 8488 for Emergencies and Risk Prevention in Costa Rica. F.P-S. is supported by grant IJC2018-035180-I from the Spanish Ministry of Science and Innovation.-
dc.publisherSpringer Nature-
dc.subjectCosta Rica-
dc.subjectSan Cayetano-
dc.subjectAcid rock drainage-
dc.subjectMicrobial communities-
dc.subjectOxygen gradient-
dc.titleMicrobial Community Structure Along a Horizontal Oxygen Gradient in a Costa Rican Volcanic Influenced Acid Rock Drainage System-
dc.contributor.funderUniversidad de Costa Rica-
dc.contributor.funderMinisterio de Ciencia, Tecnología y Telecomunicaciones (Costa Rica)-
dc.contributor.funderFederal Ministry of Education and Research (Germany)-
dc.contributor.funderEuropean Research Council-
dc.contributor.funderMinisterio de Ciencia, Innovación y Universidades (España)-
dc.contributor.funderAgencia Estatal de Investigación (España)-
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