Biocides inducing resistance in Lascaux cave’s microbes
Biocides used in recent years to treat the growth of a black fungus on the cave-art-festooned walls of France’s Lascaux cave have eradicated some populations of human-introduced bacteria and fungi. However, those that remain — including some related to known human pathogens — are becoming biocide-resistant, researchers report in an upcoming issue of Naturwissenschaften.
The new findings come from analyses of around a dozen samples taken from several areas in the cave between April 2006 and January 2007, says Claude Alabouvette, a microbiologist at the University of Bourgogne in Dijon, France. Some of the samples came from areas that were obviously infested with fungal colonies, and others were taken from cave walls that lacked such infestations, he notes.
Human presence has caused problems in Lascaux almost since its discovery in 1940. Lights added so tourists could see the cave art, images of bulls and other creatures believed to be painted more than 17,000 years ago, triggered the growth of algae. The heat from those lights — as well as tourists’ body heat and exhalations, the skin cells they shed and the microbes they unwittingly tracked in — changed the cave environment drastically, Alabouvette says.
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The new findings come from analyses of around a dozen samples taken from several areas in the cave between April 2006 and January 2007, says Claude Alabouvette, a microbiologist at the University of Bourgogne in Dijon, France. Some of the samples came from areas that were obviously infested with fungal colonies, and others were taken from cave walls that lacked such infestations, he notes.
Human presence has caused problems in Lascaux almost since its discovery in 1940. Lights added so tourists could see the cave art, images of bulls and other creatures believed to be painted more than 17,000 years ago, triggered the growth of algae. The heat from those lights — as well as tourists’ body heat and exhalations, the skin cells they shed and the microbes they unwittingly tracked in — changed the cave environment drastically, Alabouvette says.