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• W2171366576 abstract "Active intervention of humans in pristine water resource environments has caused both surface and ground waters to degrade in quality and natural purification capacity (Geldreich 1996). Groundwater is often considered to be less impacted than that of surface water due to the absence of climatic changes and storm water migrations (Geldreich 1996). Shallow karstic limestone areas (less than 30 m deep) have a greater chance of surface contamination since surface water runoff can rapidly percolate through areas lacking a protective bedrock layer. A deeper (485 m), cavernous environment such as Lechuguilla Cave, however, remains isolated from most percolation contamination making it an ideal, nearly virginal ecosystem for answering water quality and microbiological questions (Turin and Plummer 2000). When humans intrude on these pristine ecosystems, however, the resident microbial communities are jeopardized. Human-associated bacteria, prevalent on hands and fecal material, increase the chances for coliform contamination. Despite numerous conservation attempts made by Carlsbad Caverns National Park, researchers, mapping, exploration and restoration teams, some Lechuguilla cave waters have become contaminated with coliforms within the past several years. Research conducted during this study found coliforms residing between 0.4 and 27 CFU’s (colony forming units) / 100 mls in six different water locations. This study also addressed the persistence of these coliforms and their potential synergism with natural microbial biofilm populations, morphologically similar to Hyphomicrobium sp., whose growth is enhanced by VWR Tygon water siphoning hoses. Alternative fungus resistant hoses not supporting biofilm growth were also researched finding Silicon Masterflex and Teflon as the best replacements for the current VWR Tygon hoses. When groundwater environments, such as Lechuguilla Cave, become contaminated the process of restoring water purity is very slow (Geldreich 1996). Pools within Lechuguilla are a necessary source of drinking water for cavers and are critical in addressing both microbiological and water quality issues. Most importantly, the natural waterborne microbial populations could be adapting to and relying on our human inputs. The potential for a shift in resident microbial communities is a real threat when any pristine environment is invaded. Implementing further cave management recommendations such as sterile procedures at water sources, removal of the current VWR Tygon hoses and installation of a more inert thermoplastic will discourage nonnative, human-associated microbial growth and minimize further impact at these delicate cave pools." @default.
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• W2171366576 date "2010-01-01" @default.
• W2171366576 modified "2023-09-27" @default.
• W2171366576 title "Environmental disturbance of oligotrophic bacteria and effects on water quality in deep karstic pools" @default.
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