•  
  •  
 

Volume 50, Issue 2 (2021)

Articles

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

The impact of burning on the structure and mineral composition of bat guano
Joyce Lundberg and Donald A. McFarlane

  • Many features of burnt guano cannot easily be distinguished from non-burnt guano
  • Rapid dehydration from burning causes morphological change to crystals (cracking, striations)
  • Many so-called “high temperature” minerals are not diagnostic of fire, other than graphite.
  • Most “high temperature” minerals can also be produced at low temperatures
  • Spontaneous combustion of guano (without human involvement) is extremely unlikely

PDF

Cave-dwelling heleomyzid flies (Diptera: Heleomyzidae) from the Polish caves. Historical overview and new data
Joanna Kocot-Zalewska and Andrzej J. Woźnica

  • Altogether 23 heleomyzid species from 7 genera were identified
  • 1 species was considered as troglobiont, i.e., Oecothea praecox
  • 11 species were recognized as eutroglophiles, 9 as subtroglophiles, 2 as trogloxenes
  • Dominant taxa: Scoliocentra brachypterna, Heleomyza captiosa, Eccoptomera pallescens
  • The highest number of species has been found in the Kraków-Częstochowa Upland