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Volume 50, Issue 3 (2021)

Articles

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Do different relevance attributes indicate the same conservation priorities? A case study in caves of southeastern Brazil
Maysa F.V.R. Souza, Denizar A. Alvarenga, Marconi Souza-Silva, and Rodrigo L. Ferreira

  • The biological relevance of caves changes dramatically according to their ecological attributes
  • If used alone, certain indices may be inappropriate for subterranean ecological patterns
  • Caves can be devalued for not taking into account their ecological attributes
  • We recommend the conservation of an extremely relevant cave in the study region

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Geochronological implications of 210Pb and 137Cs mobility in cave guano deposits
Donald A. McFarlane and Joyce Lundberg

  • 210Pb and 137CS dating techniques have been used to establish chronologies guano deposits
  • Guano deposits may experience rapid decomposition resulting in low pH fluids in the guano
  • 210Pb and 137CS are shown to be highly mobile under moist, low Ph conditions
  • 210Pb and 137Cs chronologies should be supported by an independent, concordant 14C date series

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Geochemistry of phosphatic nodules as a tool for understanding depositional and taphonomical settings in a Palaeolithic cave site (San Teodoro, Sicily)
Gerlando Vita, Vittorio Garilli, Mirko Andrea Vizzini, Renato Giarrusso, Angelo Mulone, Massimiliana Pinto Vraca, Valeria La Parola, Pierluigi Rosina, Laura Bonfiglio, and Luca Sineo

  • Geochemistry explained stratigraphy in the Palaeolithic San Teodoro Cave site
  • Study of phosphate nodules allows revision of palaeoenvironmental reconstructions
  • Variscite and amorphous phosphate formed in nodules as result of acidification by bat guano and bone dissolution
  • Taphonomical processes involving bone dissolution made sterile part of the deposit
  • Enrichment in barium and rubidium resulted from interaction of bio and geological processes

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Air pressure propagation through Wind Cave and Jewel Cave: How do pressure waves travel through barometric caves?
Annika K. Gomell, Daniel C. Austin, Marc J. Ohms, and Andreas Pflitsch

  • Inside barometric caves, air pressure signals are delayed, smoothed and damped
  • These changes are caused by altitude differences and long response times of the caves
  • In Wind Cave, the related processes take place primarily in the entrance area
  • In Jewel Cave, the related processes take place primarily in the deep parts of the cave
  • Thus induced compensating currents control the caves' microclimate

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The relative importance of wind-driven and chimney effect cave ventilation: Observations in Postojna Cave (Slovenia)
Lovel Kukuljan, Franci Gabrovsek, and Matthew Covington

  • Winds can enhance or diminish typical seasonal density-driven cave ventilation
  • The wind-driven effect is generated by variations in the wind pressure field
  • The effect depends on the cave configuration and its surface connections
  • This study provides a better understanding of cave climate and karst processes

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