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Volume 50, Issue 2 (2021)

Articles

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Ecophysiological responses of two closely related epigean and hypogean Niphargus species to hypoxia and increased temperature: Do they differ?
Tatjana Simčič and Boris Sket

  • Oxygen consumption of both Niphargus species increased during post-hypoxic recovery
  • Oxygen consumption of hypogen species gradually decreased after reaching maximum
  • Increased temperature modified the metabolic responses to hypoxia
  • Responses differed between closely related epigean and hypogean Niphargus species

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Bacteria, guano and soot: Source assessment of organic matter preserved in black laminae in stalagmites from caves of the Sierra de Atapuerca (N Spain)
Joeri Kaal, Virginia Martínez-Pillado, Antonio Martínez Cortizas, Jorge Sanjurjo Sánchez, Arantza Aranburu, Juan-Luis Arsuaga, and Eneko Iriarte

  • We determined the molecular composition of speleothem organics in black laminae
  • Py-GC-MS and THM-GC-MS indicate bacteria, soot and guano remains
  • Soot marks nearby human activity but microbial sources prevail
  • Molecular screening of bulk organics is a tool to decide further targeted analyses

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Microbially-mediated carbonate dissolution and precipitation; towards a protocol for ex-situ, cave-analogue cultivation experiments
Vanessa E. Johnston, Andrea Martín-Pérez, Sara Skok, and Janez Mulec

  • Carbonate tablets inoculated with microbes from Postojna Cave, Slovenia, were observed with SEM
  • Microbes and extracellular polymeric substances seen on polished tablet surfaces
  • Microbially-mediated calcite dissolution/precipitation occurred in cave-like conditions
  • Evidence of entombment of microbes in a Si-rich precipitate
  • Methodological improvements suggested for ex-situ cave-analogue cultivation experiments

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Flow dynamics in a vadose shaft – a case study from the Hochschwab karst massif (Northern Calcareous Alps, Austria)
Eva Kaminsky, Lukas Plan, Thomas Wagner, Barbara Funk, and Pauline Oberender

  • Highly dynamic runoff (factor 9500) in a vadose canyon 100 m below the surface
  • Transit velocities differ by three orders of magnitude between base and high flow
  • Recession analysis and numerical modelling indicate a low water storage volume

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Multi-criteria analysis for mapping susceptibility to iron formation caves development in the Gandarela mountain range (MG), southeast Brazil
Iraydes Tálita Nola and Luis Almeida Bacellar

  • Karst features in iron-rich geological materials are described
  • The genesis and geographical location of iron caves are not yet properly defined
  • The susceptibility of caves using fuzzy AHP demonstrate good predictive ability
  • Iron formation caves susceptibility map is useful for speleological prospecting
  • Slope gradient criterion was relevant for assessing the susceptibility of caves