Microbiology of a NaCl stalactite ‘salticle’ in Triassic halite |
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Authors: | Thomas P Thompson Stephen A Kelly Timofey Skvortsov Gill Plunkett Alastair Ruffell John E Hallsworth Jason Hopps Brendan F Gilmore |
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Institution: | 1. Biofilm Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, Belfast, BT9 7BL UK;2. School of Natural and Built Environment, Department of Archaeology, Geography and Palaeoecology, Queen's University Belfast, Belfast, BT7 1NN UK;3. Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, BT9 5DL UK;4. Irish Salt Mining & Exploration Company Ltd., Carrickfergus, BT38 9BT UK |
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Abstract: | Large regions of Earth's surface are underlain by salt deposits that evaporated from ancient oceans and are populated by extreme halophilic microbes. Some of these halophiles may have been preserved over geological timescales within hypersaline fluid inclusions, but ingresses of water and/or anthropogenic activities can lead to the formation of alternative habitats, including NaCl stalactites or other speleothems. While the microbiology of ancient evaporites has been well studied, the ecology of these recently formed structures is less-well understood. Here, the microbiology of a NaCl stalactite (‘salticle’) in a Triassic halite mine is characterized. The specific aims were to determine the presence of fluid inclusions, determine the microbial structure of the salticle compared with a nearby brine-pool and surficial soil, and characterize the ecophysiological capabilities of this unique ecosystem. The salticle contained fluid inclusions, and their microbiome was composed of Euryarchaetota, Proteobacteria, and Actinobacteria, with Haloarchaea in greater abundance than brine-pool or soil microbiomes. The salticle metagenome exhibited a greater abundance of genes involved in osmoregulation, anaerobic respiration, UV resistance, oxidative stress, and stress-protein synthesis relative to the soil microbiome. We discuss the potential astrobiological implications of salticles as enclosed salt-saturated habitats that are protected from ionizing radiation and have a stable water activity. |
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