Community news

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 ferric oxide is rust; hematite (fe2o3) [16].?

Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms

What is Karstbase?



Browse Speleogenesis Issues:

KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
See all featured articles
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;
See all featured articles from other geoscience journals

Search in KarstBase

Your search for disturbance (Keyword) returned 32 results for the whole karstbase:
Showing 1 to 15 of 32
Fungal communities on speleothem surfaces in Kartchner Caverns, Arizona, USA, , Vaughan Michael J. , Maier Raina M. , Pryor Barry M.

Kartchner Caverns, located near Benson, Arizona, USA, is an active carbonate cave that serves as the major attraction for Kartchner Caverns State Park. Low-impact development and maintenance have preserved prediscovery macroscopic cavern features and minimized disturbances to biological communities within the cave.. The goal of this study was to examine fungal diversity in Kartchner Caverns on actively-forming speleothem surfaces. Fifteen formations were sampled from five sites across the cave. Richness was assessed using standard culture-based fungal isolation techniques. A culture-independent analysis using denaturing gradient gel electrophoresis (DGGE) was used to assay evidence of community homogeneity across the cave through the separation of 18S rDNA amplicons from speleothem community DNA. The culturing effort recovered 53 distinct morphological taxonomic units (MTUs), corresponding to 43 genetic taxonomic units (GTUs) that represented 21 genera. From the observed MTU accumulation curve and the projected total MTU richness curve, it is estimated that 51 percent of the actual MTU richness was recovered. The most commonly isolated fungi belonged to the genera Penicillium, Paecilomyces, Phialophora, and Aspergillus. This culturebased analysis did not reveal significant differences in fungal richness or number of fungi recovered across sites. Cluster analysis using DGGE band profiles did not reveal distinctive groupings of speleothems by sample site. However, canonical correspondence analysis (CCA) analysis of culture-independent DGGE profiles showed a significant effect of sampling site and formation type on fungal community structure. Taken together, these results reveal that diverse fungal communities exist on speleothem surfaces in Kartchner Caverns, and that these communities are not uniformly distributed spatially. Analysis of sample saturation indicated that more sampling depth is required to uncover the full scale of mycological richness across spelothem surfaces.

Geomorphology and Past Environments at Nombe Rockshelter, Simbu Province, Papua New Guinea, 1981, Gillieson David S. , Mountain Maryjane

The geomorphic development of a limestone rockshelter in the Chimbu region of New Guinea is outlined. The sedimentary sequence and associated artifactual material are described and related to regional chronology. Disturbance of the rockshelter deposits by seismic and erosive processes is indicated, and must be borne in mind when excavating and analysing material from similar sites.

Virginia Burial Caves: An Inventory of a Desecrated Resource, 1997, Hubbard Jr. , David A. , Barber, M. B.
In an ongoing inventory of Virginia cave resources, 23 burial caves have been field documented by the Marginella Burial Cave Project (MBCP). All but one site have been vandalized to varying degrees. In addition to the burial resource inventory, goals of the MBCP include measures for site protection and education. Problems have been encountered by the MBCP in attaining these goals. The sensitive and sacred nature of these cave resources, however, warrant limiting site specific discussions to protected sites. One burial cave in Montgomery County and two in Lee County are protected by gates because of recent disturbances. Adams Cave (44MY482) served as a party cave, but was not known as a burial site until a student brought a human mandible and two long bone fragments to a college professor and an investigation ensued. Indian Burial Cave (44LE11) was known locally as a burial cave and has suffered desecration for decades. Bone Cave (44LE169) was known locally as a burial site, mistakenly attributed to black slaves, but MBCP and Phase II archaeological investigations documented this Native American burial site and provided information that helped to alter the path of a road realignment through the cave. The examination and analysis of these and other Virginia caves by the MBCP has resulted in significant new knowledge about the use and distribution of caves as Native American burial sites.

Geoecological system of karst , 1998, Bá, Rá, Nykevei Ilona

The paper presents some results of the karst geo-ecological system research. The first sphere of the karst-ecological system is the karst microclimate in accordance with the microclimatic factors. Macroclimate is responsible for the quantity and intensity of precipitation while microclimatic effects modify the quantity of water infiltrating to the rocks. Microclimate affects the development of vegetation, soil temperature and humidity. Millions of microorganisms live in the soil, changing the components of soil-air through the decomposition of organic materials and through their own metabolism. They also influence the physical and chemical soil properties indirectly. The inner dynamism of soil can prevent extreme changes occurring in the system, it can change, possibly leading to disturbance in the whole system. The changes due to external effects are reversible down to the rock boundary. When they have entered the rock layer, they become irreversible. Water in the rock layer is the transport agent of materials and energy. This water reaches the surface again in karst springs. Another irreversible process, the dripstone degradation can also be due to polluted water.

Bats of Kartchner Caverns State Park, Arizona, 1999, Buecher, D. C. , Sidner, R. M.
Kartchner Caverns, in southeastern Arizona, is a summer maternity roost for approximately 1000-2000 cave myotis (Myotis velifer). The pregnant females first arrive at the cave in late April, give birth in June, and have left by mid- September. These bats are an important element in the cave ecosystem because their excrement introduces nutrients, which support a complex invertebrate cave fauna. Bat population densities and emergence behavior was monitored between 1988-1991. Other bat species seen using the entrance areas of the cave include Corynorhinus townsendi and Choeronycteris mexicana. Because bats are easily disturbed by human intrusion into the roost, the baseline study was accomplished using low-disturbance techniques in an effort to provide the greatest amount of data with the least disturbance to the bat colony. These techniques included limited visual observations in the roost and netting bats only on the surface at a nearby water tank. During the baseline study, an episode of predation by a carnivore (Bassariscus astutus) caused the bats to abandon the site for a short time. Carbon-14 dating of guano from the Throne and Rotunda Rooms suggests that Myotis velifer used the Back Section of Kartchner Caverns 50-45 years Ka.

Structures tectoniques et contraintes de cheminement des eaux dans les aquiferes karstiques du barrois (Lorraine/Champagne, France), 1999, Devos A, Jaillet S, Gamez P,
Between Lorraine and Champagne, in the east of the Paris Basin, covered karst is developed in Portlandien limestone of Barrois in contact with sand and clay of the Perthois Cretaceous. The cuesta landscape is altered by folding tectonics (syncline of Treveray) and faulting tectonics (fault trough of the Marne). These govern the organization of underground flow. In low water period, hydrological methods (smoothed hydrological profiles, water tracing) display disturbances of the Barrois river (Saulx, Marne) and limits of underground watershed ('Rupt-du-Puits' cave system, 21 km long, 13 km). Macro-tectonics influence vertical infiltration (pit). Fault and dip (Macro-tectonics) divide the aquifer into different sections. Hydrological methods with flow studies confirm structural tilting of the area to the west.ResumeEntre Lorraine et Champagne, dans l'est du Bassin parisien, au contact des calcaires portlandiens du Barrois et des sables et argiles cretaces du Perthois, se developpe un karst couvert. Le paysage de cotes est ici perturbe par une tectonique souple (synclinal de Treveray) et cassante (fosse d'effon-drement de la Marne) determinant l'organisation spatiale des ecoulements. En periode d'etiage, les methodes hydrologiques (profils hydrologiques lisses, tracages), permettent de montrer l'influence de cette tectonique d'ondulation et de basculement sur l'ecoulement des rivieres barroises (Saulx, Marne). Fractures et microfractures influencent la zone de transit vertical des eaux du karst (zone des puits) tandis que les failles compartimentent les aquiferes (systeme du Rupt-du-Puits, 21 km de conduits, 13 km2). Les methodes d'etudes hydrologiques, confirment le basculement de la region vers l'ouest deduit des comparaisons de nivellement

The use of alkalinity as a conservative tracer in a study of near-surface hydrologic change in tropical karst, 1999, Chandler Dg, Bisogni Jj,
Water shortages commonly increase in frequency following forest clearance on lauds overlying karst in the tropics. The mechanism underlying this hydrologic change is likely to depend on the land use which follows forest cover. To determine the flow paths which prevail for a progression of land uses common to the uplands of Leyte, Philippines, samples of interflow were collected during the rainy season and titrated to determine their alkalinities. The ratio of the measured alkalinity to the value predicted by equilibrium calculations for each sample was used as an indication of the contact time of the water with the limestone. The responses of the alkalinity saturation ratio and the runoff depth to increasing rainfall depth were used to substantiate the hypothesis that epikarst infilling and changing soil structure create throttles to percolation and infiltration. The forest site was found to generate interflow primarily as pipe how, with the infiltration and percolation throttles rarely exceeded. Similarly, infiltration was not: limiting for the slash/mulch Site, however, level of soil disturbance was adequate to initiate a throttle at the epikarst which increased the volume of interflow generated. The total percolation was similar for the plowed and slash/mulch sites; however, the interflow was decreased at the plowed site by reduced infiltration at the soil surface. The throttles to surface infiltration and epikarst percolation were even greater at the pasture sites, resulting in high runoff generation. However, comparatively greater infiltration was observed in the pasture having contour-hedgerows. (C) 1999 Elsevier Science B.V. All rights reserved

Effect of Trail Users at a Maternity Roost of Rafinesque's Big-Eared Bats, 2000, Lacki, M. J.
While bat-roosting sites continue to be targets of vandalism, Hood Branch Rock Shelter in Natural Bridge State Park, Kentucky, provides habitat for Corynorhinus rafinesquii (Rafinesques big-eared bat). The shelter lies immediately adjacent to a hiking trail (Upper Loop Trail); therefore, the bats are potentially subject to disturbance by park visitors. This study monitored the behavior patterns of park visitors using the trail for potential disturbance effects at the shelter, and compared these data to population size and activity patterns of C. rafinesquii inhabiting the shelter from March to September 1998. Data indicate that a bypass trail directed many visitors away from the entrance to the shelter, but some visitors used the trail adjacent to the shelter and exhibited behavior potentially disruptive to the bats. The shelter was occupied by a maternity colony of Corynorhinus rafinesquii from late April to mid-July, a period in which access to the shelter was restricted due to debris and washouts along the trail from a severe storm in winter 1998. However, the shelter was abandoned by the bats within two weeks after the trail was cleared of debris. Although cause and effect cannot be directly inferred from collected data, the likelihood that the bats abandoned the shelter because of human intrusion is strong. The suitability of this shelter as a maternity roost of C. rafinesquii may be jeopardized by park visitors hiking the adjacent trail, suggesting closure of the Upper Loop Trail as the most viable option for protecting C. rafinesquii in Hood Branch Rock Shelter

Field assessment of the microclimatology of tropical flank margin caves, 2000, Gamble Dw, Dogwiler Jt, Mylroie J,
Temperature observations were collected inside 2 caves in the Bahamas and 1 cave in Puerto Rico to characterize the microclimatology of tropical flank margin cave systems. Three aspects of these tropical cave temperatures agree with temperate cave microclimate theory. Specifically, external atmospheric disturbances can affect temperatures inside tropical flank margin cave systems, tropical flank margin caves are warmer than the exterior temperatures during winter, and water can impact temperatures deep into a tropical flank margin cave system. The temperature observations collected also indicate potential differences between the microclimatology of tropical and temperate cave systems. In particular, the temperate 3-zone cave microclimate model may not be applicable to tropical flank margin caves, diurnal fluctuations were not apparent in tropical flank margin cave systems, and the existence of a temperature inversion in a down-sloping cave may not be applicable to all tropical flank margin caves. The potential differences in temperate and these tropical cave systems can be linked to the physical dimensions of the tropical flank margin cave systems and the unique hydrology of small carbonate islands. Specifically, tropical flank margin caves have a width greater than length while temperate fluvio-karst caves have a length greater than width and tidal water can exist in the pits and depressions of tropical flank margin caves as opposed to flowing streams in temperate cave systems

Forest recovery in abandoned agricultural lands in a karst region of the Dominican Republic, 2000, Rivera L. W. , Zimmerman J. K. , Aide T. M. ,
This study documents the status of forest vegetation in the karst region of Los Haitises National Park, Dominican Republic, following the abandonment of pastures (less than or equal to 5 years), young (less than or equal to 5 years) 'conucos' (mixed plantings), old (7-30 years) conucos, and cacao plantations (> 25 years). We compared these sites to vegetation characteristics of patches of forest in karst valleys ('old forest'-too old to know their exact land use) and on mogote tops with no recent history of human disturbance. The youngest sites date to when squatters were removed from Los Haitises National Park. Forest structure (density, basal area, and species richness of woody plants greater than or equal to 1 cm DBH) were all significantly affected by land use. Density was highest in intermediate-aged valley sites (old conucos) and mogote tops, while both basal area and species richness tended to increase with age of abandonment. Although cacao plantations had been abandoned for more than 25 years the species diversity was low, due to continued regeneration of this persistent crop. Abandoned pastures had the greatest nonwoody biomass and were dominated by the fern Nephrolepis multiflora which had completely replaced pasture grasses. An ordination of the woody plant communities separated the mogote tops from valleys, emphasizing the strong control that topography has on the forest community in moist and wet tropical forests on karst substrates. Valley sites were arranged in the ordination in order of their age, suggesting a successional sequence converging on the composition of the 'old forest' sites

Palaeoseismic events in karst terrains along the northern Bulgarian Black Sea coast, 2001, Angelova D,
The study of the palaoseismic events in the karst terrains of the Bulgarian Black Sea coast is a very important up-to-date problem. The investigated region is one of the highest-energy regions in Bulgaria with established and recorded catastrophic historic and contemporary earthquakes. The terrain is subjected to the influence not only of its own earthquake foci but also of those in Romania and Russia. The palaeoearthquakes that caused considerable disturbances in the karst terrains along the Northern Bulgarian Black Sea coast have left significant traces. They caused disturbances in the environment and the relief (rearrangement of the surface and ground water karst basins, partially or entirely collapsed caves, deformed caves, oil, gas and salt intrusions and gravitationally formed caves). The ecological consequences in historic and contemporary aspects were catastrophic. The palaeoseismic dislocations were formed as a result of global, regional and local geodynamic events related with the destruction of the Moezian platform and the regional extension of the Black Sea basin. The time of their display and their spatial interrelations were established as a result of complex investigations accompanied by original documents

Subterranean Fauna of Christmas Island, Indian Ocean, 2001, Humphreys W. F. , Eberhard Stefan

The subterranean environment of Christmas Island is diverse and includes freshwater, marine, anchialine, and terrestrial habitats. The cave fauna comprises swiftlets, and a diverse assemblage of invertebrates, both terrestrial and aquatic, which includes a number of rare and endemic species of high conservation signicance. At least twelve species are probably restricted to subterranean habitats and are endemic to Christmas Island. Previously poorly known, the cave fauna of Christmas Island is a signicant component of the island's biodiversity, and a signicant cave fauna province in an international context. The cave fauna and habitats are sensitive to disturbance from a number of threatening processes, including pollution, deforestation, mining, feral species and human visitors.

Les travertins de Saint-Antonin : squence gobotanique et climato-anthropique holocne (Bouches-du-Rhne, France), 2003, Guendon Jeanlouis, Ali Adam A. , Roiron Paul, Terral Jeanfrdric, Danna Andr, Diazdelolmo Fernando, Baenaescudero Rafael
Travertine deposit of St-Antonin (Bouches-du-Rhne, France): lithostratigraphy, palaeobotany and Holocene palaeoenvironments - Travertines are carbonate deposits formed generally during temperate climatic periods. The travertine of Saint-Antonin was formed during the Holocene in accordance with this model. They usually present a succession of travertinous units and detrital sedimentary levels containing, respectively, leaf impressions and charcoal; snail shells and archaeological material have also been preserved, essentially in detritial levels. Two kinds of plant remains (leaf imprints and charred wood) have been sampled and analysed, allowing the reconstruction of vegetation dynamics based on a well-defined sedimentary sequence. Our results were compared with those of previous malacalogical, archaeological studies and climatic changes. The Preboreal and Boreal sequence, characterised by travertine unites with detritial deposits, is dominated by a riverside vegetation (Populus alba, Salix sp., Phragmites communis) associated with some pubescent oak growing in the plateau. After this first period, detritial levels and hygrophilous species decrease. Correlatively travertinous facies and leaf impressions of mesophilous forest species increase (Quercus pubescent, Acer monspessulanum). They suggest the existence of homeostatic conditions, such as regular river flow, dense vegetation and few disturbances during deposition. The Middle Atlantic period shows optimal travertinisation and maintenance of forest environment. But this period is characterised by the beginning of the Quercus pubescens regression and the dominance of Acer monspessulanum. From the Atlantic to the first part of Subboreal, important detrital sedimentary levels disturb the deposition of carbonate. They contain reworked archaeological material dating to the Neolithic. Vegetation seems to have been profoundly affected by intensive human exploitation. This process has broken up the forested area into different plant communities and favoured the dominance of heliophilous and thermophilous species (Pinus halepensis, Rubus ulmifolius and Juniperus sp.).

Paleoseismic phenomena in karst terrains in Bulgaria and Morocco, 2003, Angelova Dora, Belfoul M'hamed Alaeddin, Bouzid Sophia, Filahi Mustapha, Faik Farid

During the recent years there has been a growing interest in recording and investigating the effects of paleoseismic events in surface and underground karst in almost all countries. Karst represents a reliable reference marker for understanding the potential seismicity in regions with instrumentally established low to moderate seismicity. The karst errains in Bulgaria and Morocco occupy considerable areas. The disturbances in surface and underground karst had usually been provoked by catastrophic one-act events or by repeatedly activated movements by earthquakes. The catastrophic seismic events had disturbed the naturally interrelated karst ecosystems and were the reason for rejuvenation, reactivation or attenuation of karst processes. The natural surface and underground relief had been partially or entirely destroyed; a new type of relief had been formed; the geological environment had been disturbed; changes occurred in the flowrate and direction of surface and underground karst water; wetlands of the gravitation type had been formed; natural caves, local grabens, rock-falls and landslides collapsed partially or entirely and terrains were subjected to subsidence and destruction; the ecological balance in urbanized territories had been disturbed. The present work considers the different types of paleoseismic phenomena in the karst terrains in Bulgaria and Morocco. Recommendations are given for the protection of these areas.

Human influence on the choice of winter dens by European brown bears in Slovenia, 2004, Petram Welf, Knauer Felix, Kaczensky Petra,
The Slovenian brown bear (Ursus arctos ) population is the only viable population in Central and Western Europe, and it coexists with humans in a multi-use landscape. Bears are most vulnerable to human disturbances during denning. To assess the influence of humans on the choice of winter dens by bears we compared availability and use of caves suitable for denning in central Slovenia. Surprisingly, all direct measures of human influence showed no or only a small effect on the use of the caves by bears. We found that the landscape type (big dolines, canyons, river valleys, and karst plateau) was the most important variable. The less accessible a landscape type is, the more it is used. The probability that a cave in a big doline is used is about 200 times higher than on the karst plateau. Furthermore bears preferred long caves with small entrances away from villages. Bears did not use any cave caves were predicted correctly by our model of being used or unused. For conservation and human safety reasons, human activity should be banned from steep ravines and large karst dolines in winter

Results 1 to 15 of 32
You probably didn't submit anything to search for