Raffaele Peduzzi's research while affiliated with University of Geneva and other places

... Subaquatic springs within the Triassic rocks that dip below the lake maintain a flow of solute-rich groundwaters to the lake. As a result, a strong density gradient exists in the water column leading to permanent stratification with an oxic mixolimnion, an anoxic monimolimnion, and a chemocline at a depth of 10 to 14 m separating the two water masses (Del Don et al., 2001). Fig-ure 1b shows water-column profiles of dissolved O 2 and H 2 S, as well as the electrical conductivity and water temperature, demonstrating the contrasting chemical and physical properties of Lake Cadagno above and below the chemocline (Dahl et al., 2010). ...

... All rights reserved. and human safety (Corvaglia et al., 2008;Xu et al., 2011;Manzetti and Ghisi, 2014;Lee et al., 2014;Iliev et al., 2015;Jahne et al., 2015). ...

... Dibothriocephalus dendriticus) plerocercoids in fish has been identified at 83.2% and 8.8% [41] and D. latum (syn. D. latus) the mean infection intensity has been identified as low as 1.25 parasites/fish [42]. ...

... Dispersal of adult Ae. albopictus by ground vehicles (e.g. trucks and private vehicles) from Italy is believed to have resulted in the dispersal of this species into Switzerland, Slovenia, San Marino, the Czech Republic, Croatia and Germany [16][17][18][19][20][21]. In Spain, dispersal of adult Ae. albopictus inside private vehicles across the country was directly observed in multiple instances [5], likely contributing to the rapid spread of Ae. albopictus throughout Spain since its first detection in 2004. ...

... In this study, we investigate the sediments of Lake Cadagno, a meromictic lake in the Swiss Alps with a wellstudied sedimentary record (Wirth et al., 2013;Berg et al., 2022) and known for its dense populations of diverse phototrophic sulfur bacteria (Tonolla et al., , 2005Peduzzi et al., 2012Peduzzi et al., , 2011. Therefore, it is an ideal site to test the feasibility of using HSI to measure GSB-related bacteriochlorophylls in sediments that contain a mixture of pigments from both oxic and anoxic phototrophs. ...

... Parallel to this evolution, Lake Cadagno sediments have changed from organic-poor, oxic glacial clays to organic-rich, anoxic sediments. The transition from fully mixed, oxygenated waters to stratified, permanently anoxic bottom waters was driven by the inflow of saline sulfidic subaquatic springs since the end of the last glacial stage (Del Don et al., 2001;Wirth et al., 2013). The presence of anoxic sulfidic conditions, together with anoxygenic photosynthesis, has made Lake Cadagno a famous analog for oceanic conditions on the early Earth (Dahl et al., 2010;Wirth et al., 2013;Xiong et al., 2019). ...

... Desulfomonile tidjei in the monimolimnion of Lake Cadagno is easily recognizable as it emits a green fluorescence after acridine orange staining (Bensadoun et al. 1998) and is detectable with the two specific probes DsmA445 and DsmB455 (Tonolla et al. 2005a). Its vertical distribution was unusual, compared with other SRB, as it did not produce a maximum in abundance in the chemocline, but its distribution pattern followed that of hydrogen sulphide profiles. ...

... Pure cultures of ''morphotype R'', however, are not available yet and attempts to characterize ''morphotype R'' by molecular methods such as, e.g., by in situ hybridization with probes commonly used to analyze populations of sulfate-reducing bacteria on a lower taxonomic level [23,24] were not successful [17]. The aim of this study was therefore to take advantage of the availability of two gene clone libraries of almost complete 16S rRNA genes retrieved by PCR from DNA samples obtained from uncultured bacteria of the chemocline [25] in order to phylogenetically characterize ''morphotype R'' unaffected by the limitations of culturability. After comparative sequence analysis of clones selected after hybridization with probes SRB385Db and DSS658 targeting members of the Desulfobacteriaceae , specific oligonucleotide probes were designed and used to evaluate the significance of the sequences in environmental samples. ...

... based on previous descriptions in the literature (e.g. ref. 35 ). Other bacteria were also present, however only in low numbers (<10%). ...

... Although surface sulfide minerals can have diverse origins, sedimentary processes predominate over magmatic, hydrothermal, and volcanic ones . In modern environments, sulfide formation is mainly driven by the metabolism of sulfatereducing microorganisms (SRM), which are prevalent in anoxic environments, e.g., marine sediments or water column of permanently stratified euxinic waters such as the Black Sea (Vetriani et al., 2003) or Lake Cadagno (Tonolla et al., 2004) or even in ferruginous environments such as Lake Pavin (Lehours et al., 2005;Berg et al., 2016;Berg et al., 2019). Understanding the mechanisms of a possible biogenic pyrite formation pathway is crucial as pyrites are used as paleoenvironmental proxies and might also be good candidates for the search of biosignatures of early life (Shen and Buick, 2004). ...