| Diana E. Northup | Penelope J. Boston |
| University of New Mexico | Complex Systems Research |
| Michael N. Spilde | Clifford N. Dahm |
| University of New Mexico | University of New Mexico |
| Laura J. Crossey | Susan M. Barns |
| University of New Mexico | Los Alamos National Laboratories |
| Lawrence M. Mallory |
| Biomes, Inc. |
Caves offer accessible subterranean environments in which to study the diversity of microbial life. These ecosystems are exposed to extreme environmental stresses and may be based on inorganic energy sources rather than sunlight. An excellent example of subterranean microbial life is found in Lechuguilla Cave (New Mexico), the deepest cave in the continental United States. Lechuguilla Cave, an immense, ancient cave in near pristine condition, contains sulfur, iron, and manganese deposits and extremely low nutrient environments harboring diverse microbial life. The carbonate wallrock and overlying corroded limestone provide an excellent model for studying how life has survived, adapted, and altered this rock environment. Preliminary evidence suggests that the diverse community of microorganisms inhabiting corrosion residues includes fungi and bacteria that live by using manganese and iron. We are investigating the nature of the unusual microorganisms present, the means by which they adapt to their extreme environment, the energy sources that they use, and the overall level of biological activity of the communities. Because of the potential for subsurface life on other planets and possible chemical similarity to Lechuguilla Cave, our research will also explore the relevance of cave communities to those that may exist elsewhere.
We are currently using Scanning Electron Microscopy (SEM) and Electron Dispersive Spectroscopy (EDS) analysis to study sites in Lechuguilla Cave to search for evidence of bacteria and their potential energy sources. Preliminary results are available for four sites:
For more information about Lechuguilla:
The Lechuguilla Cave Human Impact Study