Basin-scale conceptual groundwater flow model for an unconfined and confined thick carbonate region

Mádl-Szőnyi, Judit; Tóth, Ádám

doi:10.1007/s10040-015-1274-x

Cited by 86 publications

(34 citation statements)

References 58 publications

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“…The occurrence of these indicator organisms in the cave water possibly suggests human influence, because their growth is facilitated by organic matter input (Araujo et al, 1989). The water of Molnár János Cave is currently thought to be supplied by karst and basinal fluids according to the numerical flow simulation (Mádl-Szőnyi and Tóth, 2015). Nevertheless, in the caves of Buda, the role of sewer leakage cannot be excluded under the residential area (Virág et al, 2009;Bergmann et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Comparison of bacterial and archaeal communities from different habitats of the hypogenic Molnár János Cave of the Buda Thermal Karst System (Hungary)

Anda

Krett

Makk

et al. 2017

JCKS

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The Molnár János Cave is part of the northern discharge area of the Buda Thermal Karst System, and is the largest active thermal water cave in the capital of Hungary. To compare the prokaryotic communities, reddish-brown cave wall biofilm, black biogeochemical layers, and thermal water samples from the phreatic mixing zone of the cave were subjected to three investigative approaches, scanning electron microscopy, cultivation, and molecular cloning. According to the SEM images, multilayer network structures were observed in the biofilm formed by iron-accumulating filamentous bacteria and mineral crystals. Cultivated strains belonging to Aeromonadaceae and Enterobacteriaceae were characteristic from both water and subaqueous biofilm samples. The most abundant molecular clones were representatives of the phylum Chloroflexi in the reddish-brown biofilm, the class Gammaproteobacteria in the black biogeochemical layer, and Thiobacillus (Betaproteobacteria) in the thermal water samples. The reddish-brown biofilm and black biogeochemical layer's bacterial communities proved to be somewhat more diverse than that of the thermal water. The archaeal 16S rRNA gene clone libraries were dominated by thermophilic ammonia-oxidizer Nitrosopumilus and Nitrososphaera phylotypes in all three habitats. Considering the metabolic characteristics of known species related to the detected clones, it can be assumed that these communities may participate in the local sulfur and nitrogen cycles and may contribute to microbial mediated sulfuric acid speleogenesis.

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Section: Discussionmentioning

confidence: 99%

Comparison of bacterial and archaeal communities from different habitats of the hypogenic Molnár János Cave of the Buda Thermal Karst System (Hungary)

Anda

Krett

Makk

et al. 2017

JCKS

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“…In this area hypogenic caves, thermal and lukewarm springs can be found, which are the sources of the famous spas of Budapest. In the discharge areas several active processes occur, such as cave formation and mineral precipitation [3]. The physical and chemical analysis of the biogeochemical layer formed on the cave wall below the spring water level provides information on these phenomena.…”

Section: Introductionmentioning

confidence: 99%

Microchemical characterization of biogeochemical samples collected from the Buda Thermal Karst System, Hungary

Dobosy

Sávoly

Óvári

et al. 2016

Microchemical Journal

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“…Based on preliminary hydrogeological results, the Rose Hill area are discharged by lukewarm and thermal water, while thermal water appears only in the springs of the Southern area . Thermal water contains not only karst water but also so called basinal fluid component differing for the two systems; the Rose Hill can be characterized by dominantly NaCl‐type water, while SO 4 2− ‐rich water is characteristic in the Gellért Hill discharge zone . Sulfur appears in the thermal water of the Rose Hill but more enhanced in the form of H 2 S .…”

Section: Introductionmentioning

confidence: 99%

Biofilm forming bacteria and archaea in thermal karst springs of Gellért Hill discharge area (Hungary)

et al. 2018

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The Buda Thermal Karst System (BTKS) is an extensive active hypogenic cave system located beneath the residential area of the Hungarian capital. At the river Danube, several thermal springs discharge forming spring caves. To reveal and compare the morphological structure and prokaryotic diversity of reddish-brown biofilms developed on the carbonate rock surfaces of the springs, scanning electron microscopy (SEM), and molecular cloning were applied. Microbial networks formed by filamentous bacteria and other cells with mineral crystals embedded in extracellular polymeric substances were observed in the SEM images. Biofilms were dominated by prokaryotes belonging to phyla Proteobacteria, Chloroflexi and Nitrospirae (Bacteria) and Thaumarchaeota (Archaea) but their abundance showed differences according to the type of the host rock, geographic distance, and different water exchange. In addition, representatives of phyla Acidobacteria, Actinobacteria, Caldithrix, Cyanobacteria, Firmicutes Gemmatimonadetes, and several candidate divisions of Bacteria as well as Crenarchaeota and Euryarchaeota were detected in sample-dependent higher abundance. The results indicate that thermophilic, anaerobic sulfur-, sulfate-, nitrate-, and iron(III)-reducing chemoorganotrophic as well as sulfur-, ammonia-, and nitrite-oxidizing chemolithotrophic prokaryotes can interact in the studied biofilms adapted to the unique and extreme circumstances (e.g., aphotic and nearly anoxic conditions, oligotrophy, and radionuclide accumulation) in the thermal karst springs.

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Basin-scale conceptual groundwater flow model for an unconfined and confined thick carbonate region

Cited by 86 publications

References 58 publications

Comparison of bacterial and archaeal communities from different habitats of the hypogenic Molnár János Cave of the Buda Thermal Karst System (Hungary)

Comparison of bacterial and archaeal communities from different habitats of the hypogenic Molnár János Cave of the Buda Thermal Karst System (Hungary)

Microchemical characterization of biogeochemical samples collected from the Buda Thermal Karst System, Hungary

Biofilm forming bacteria and archaea in thermal karst springs of Gellért Hill discharge area (Hungary)

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