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Speleology in Kazakhstan

Shakalov on 04 Jul, 2018
Hello everyone!   I pleased to invite you to the official site of Central Asian Karstic-Speleological commission ("Kaspeko")   There, we regularly publish reports about our expeditions, articles and reports on speleotopics, lecture course for instructors, photos etc. ...

New publications on hypogene speleogenesis

Klimchouk on 26 Mar, 2012
Dear Colleagues, This is to draw your attention to several recent publications added to KarstBase, relevant to hypogenic karst/speleogenesis: Corrosion of limestone tablets in sulfidic ground-water: measurements and speleogenetic implications Galdenzi,

The deepest terrestrial animal

Klimchouk on 23 Feb, 2012
A recent publication of Spanish researchers describes the biology of Krubera Cave, including the deepest terrestrial animal ever found: Jordana, Rafael; Baquero, Enrique; Reboleira, Sofía and Sendra, Alberto. ...

Caves - landscapes without light

akop on 05 Feb, 2012
Exhibition dedicated to caves is taking place in the Vienna Natural History Museum   The exhibition at the Natural History Museum presents the surprising variety of caves and cave formations such as stalactites and various crystals. ...

Did you know?

That seepage rate is the rate of seepage flow [16].?

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KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
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Featured articles from other Geoscience Journals
Karst environment, Culver D.C.
Mushroom Speleothems: Stromatolites That Formed in the Absence of Phototrophs, Bontognali, Tomaso R.R.; D’Angeli Ilenia M.; Tisato, Nicola; Vasconcelos, Crisogono; Bernasconi, Stefano M.; Gonzales, Esteban R. G.; De Waele, Jo
Calculating flux to predict future cave radon concentrations, Rowberry, Matt; Marti, Xavi; Frontera, Carlos; Van De Wiel, Marco; Briestensky, Milos
Microbial mediation of complex subterranean mineral structures, Tirato, Nicola; Torriano, Stefano F.F;, Monteux, Sylvain; Sauro, Francesco; De Waele, Jo; Lavagna, Maria Luisa; D’Angeli, Ilenia Maria; Chailloux, Daniel; Renda, Michel; Eglinton, Timothy I.; Bontognali, Tomaso Renzo Rezio
Evidence of a plate-wide tectonic pressure pulse provided by extensometric monitoring in the Balkan Mountains (Bulgaria), Briestensky, Milos; Rowberry, Matt; Stemberk, Josef; Stefanov, Petar; Vozar, Jozef; Sebela, Stanka; Petro, Lubomir; Bella, Pavel; Gaal, Ludovit; Ormukov, Cholponbek;
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Your search for epilithic (Keyword) returned 5 results for the whole karstbase:
PROCESSES ASSOCIATED WITH MICROBIAL BIOFILMS IN THE TWILIGHT ZONE OF CAVES - EXAMPLES FROM THE CAYMAN ISLANDS, 1995, Jones B. ,
The twilight zone of a cave, an environment transitional between the well-illuminated environment outside the cave and the dark environment of the cave interior, is one of the most unusual microenvironments of the karst terrain. Walls in the twilight zone of caves on Grand Cayman and Cayman Brac are coated with a biofilm that incorporates a diverse assemblage of epilithic microbes and copious mucus. Most microbes are different from those found elsewhere in the karst terrains of the Cayman Islands, probably because they have adapted to life in the poorly illuminated twilight zone. None of the microbes employ an endolithic life mode, and less than 10% of them show evidence of calcification. The biofilm does, however, provide a medium in which a broad spectrum of destructive and constructive processes operate. Etching, the dominant destructive process, produces residual dolomite, residual calcite, blocky calcite, and spiky calcite. Constructive processes include precipitation of calcite, dolomite, gypsum, halite, and sylvite. Although filamentous microbes are common, examples of detrital grains trapped and bound to the substrate are rare. Destructive processes are more common than constructive ones

Lecania pusilla, a new bryophilous lichen from the Trieste Karst, 1996, Tretiach M. ,
Lecania pusilla Tretiach sp. nov. is described from the Trieste Karst, where it was collected twice on epilithic mosses in protected overhangs. The new species is characterized by simple or uniseptate spores, pruinose apothecia, and Bacidia-type asci; it has a reduced, granular thallus with no lichen substances. (C) 1996 The British Lichen Society

Characterization of cave aerophytic algal communities and effects of irradiance levels on production of pigments, 2008, Mulec J. , Kosi G. , And Vrhovek D.
Aerophytic algae grow on various substrata under favourable ecological conditions. In the illuminated parts of caves, where relative humidity reaches 100%, they colonize sediments, rocky surfaces, and artificial materials. An aerophytic algal community from the cave entrance is composed almost exclusively of cyanobacteria, in contrast to lampenflora where green algae become more dominant. In the later stage of species succession in the lampenflora community, cyanobacteria are more abundant and thus community structure becomes more similar to the community from the cave entrance. Absence of correlation between photon flux density and chlorophyll a concentration indicates that substratum characteristics at the micro level notably influence algal growth. Chl a concentration per surface unit in the case of the epilithic algae from the cave entrance is lower (max. 1.71 mg cm22) compared to that for the lampenflora algae (max. 2.44 mg cm22). At cave temperatures, the light saturation point is quickly reached. At 9.0 uC and frequent low photon flux densities in a cave entrance and around lamps in show caves, biosynthesis of accessory photosynthetic pigments for two typical cave aerophytic organisms, cyanobacterium Chroococcus minutus and green alga Chlorella sp., is considerably elevated.

Distribution of cyanobacteria at the Gelada Cave (Spain) by physical parameters, 2010, Martnez A. And Asencio A. D.
As part of an extensive study of the caves in the Province of Alicante (SE Spain), the distribution of cyanobacteria and physical data for the Gelada Cave are presented. This cave is 9.4 m deep, 0.9 to 5.0 m high, 1.2 m wide, and is located in a karst region. Photon flux density, relative humidity, and temperature were measured, and the environmental ranges of conditions where growth occurred fluctuated between 0.0008 0.06 mE.m22 s 21 , 55.095.0% and 5.418.0 uC, respectively. All the microorganisms determined from the Gelada Cave were cyanobacteria. Other frequently observed groups in caves, such as Bacillariophyta and Chlorophyta, were not detected because the cave was too weakly illuminated and dry. Cyanobacteria were found to be grouped as blue, brown, green, or gray patina according to the sampling sites and their constituent organisms. The primary common stress factor on the distribution of algal communities in the Gelada Cave is light shortage, followed by humidity, lack of nutrients, and temperature. Twenty-two epilithic cyanobacteria were identified, ten of which have not been previously reported in caves. The species studied are included in the Chroococcales order (77.30%), followed by the Oscillatoriales order (13.60%) and by the Nostocales (4.55%) and Stigonematales (4.55%) orders. The extreme values of the environmental parameters are presented for each taxon in this cave.

Epilithic and aerophilic diatoms in the artificial environment of Kungstradgrden metro station, Stockholm, Sweden, 2013, Norback Ivarsson L. , Ivarsson M. , Lundberg J. , Sallstedt T. , Rydin C.

 

The Kungsträdgården metro station is an artificial and urban subsurface environment illuminated with artificial light. Its ecosystem is almost completely unknown and as a first step to better understand the biology and rock wall habitats the diatom flora was investigated. A total of 12 species were found growing on the rock walls of Kungsträdgården metro station. The results show the diatom flora in Kungsträdgården to be dominated by e.g. Diadesmis contenta, Diadesmis perpusilla, Pinnularia appendiculata, Nitzschia amphibia, Nitzschia sinuata and Diploneis ovalis. One species, Caloneis cf. aerophila, has never been reported from Sweden before. Significant differences in the species composition between the sampling sites indicate Kungsträdgården metro station to be a heterogeneous habitat that provides different microhabitats.


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