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This paper describes the chemical and isotope features of water and dissolved gases from lake Paterno (max. depth 54 m), a sinkhole located in the NE sector of the S. Vittorino plain (Rieti, Central Italy), where evidences of past and present hydrothermal activity exists. In winter (February 2011) lake Paterno waters were almost completely mixed, whereas in summer time (July 2011) thermal and chemical stratifications established. During the stratification period, water and dissolved gas chemistry along the vertical water column were mainly controlled by biological processes, such as methanogenesis, sulfate-reduction, calcite precipitation, denitrification, and NH4 and H2 production. Reducing conditions at the interface between the bottom sediments and the anoxic waters are responsible for the relatively high concentrations of dissolved iron (Fe) and manganese (Mn), likely present in their reduced oxidation state. Minerogenic and biogenic products were recognized at the lake bottom even during the winter sampling. At relatively shallow depth the distribution of CH4 and CO2 was controlled by methanotrophic bacteria and photosynthesis, respectively. The carbon isotope signature of CO2 indicates a significant contribution of deep-originated inorganic CO2 that is related to the hydrothermal system feeding the CO2-rich mineralized springs discharging in the surrounding areas of lake Paterno. The seasonal lake stratification likely controls the vertical and horizontal distribution of fish populations in the different periods of the year. Franco Tassi, University of Florence Department of Earth Sciences Jacopo Cabassi, University of Florence Department of Earth Sciences Roberto Palozzi, University of Tuscia Department of Agricolture, Forests, Nature and Energy Massimiliano Marcelli, University of Rome “La Sapienza” Department of Animal and Human Biology Marco Quartararo, University of Rome “Tor Vergata” Department of Biology Francesco Capecchiacci, University of Florence Department of Earth Sciences Matteo Nocentini, University of Florence Department of Earth Sciences Orlando Vaselli, University of Florence Department of Earth Sciences Tassi, Franco, Jacopo Cabassi, Dmitri Rouwet, Roberto Palozzi, Massimiliano Marcelli, Marco Quartararo, Francesco Capecchiacci, Matteo Nocentini, and Orlando Vaselli. 2012. “Water and Dissolved Gas Geochemistry of the Monomictic Paterno Sinkhole (central Italy)”. Journal of Limnology 71 (2):e27. https://doi.org/10.4081/jlimnol.2012.e27. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations Similar Articles Franco Tassi, Gabriele Bicocchi, Jacopo Cabassi, Francesco Capecchiacci, Orlando Vaselli, Enrico Capezzuoli, Andrea Brogi, Hydrogeochemical processes controlling water and dissolved gas chemistry at the Accesa sinkhole (southern Tuscany, central Italy) , Journal of Limnology: Vol. 73 No. 3 (2014) Claire Archer, Paula Noble, David Kreamer, Vincenzo Piscopo, Marco Petitta, Michael R. Rosen, Simon R. Poulson, Gianluca Piovesan, Scott Mensing, Hydrochemical determination of source water contributions to Lake Lungo and Lake Ripasottile (central Italy) , Journal of Limnology: Vol. 76 No. 2 (2017)

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