TY - JOUR A1 - Jung, Patrick A1 - Baumann, Karen A1 - Emrich, Dina A1 - Springer, Armin A1 - Felde, Vincent J.M.N.L. A1 - Dultz, Stefan A1 - Baum, Christel A1 - Frank, Marcus A1 - Büdel, Burkhard A1 - Leinweber, Peter T1 - Lichens Bite the Dust – A Bioweathering Scenario in the Atacama Desert JF - iScience N2 - Bioweathering mediated by microorganisms plays a significant role in biogeo-chemical cycles on global scales over geological timescales. Single processes induced by specific taxa have been described but could rarely be demonstrated for complex communities that dominate whole landscapes. The recently discovered grit crust of the coastal Atacama Desert, which is a transitional community between a cryptogamic ground cover and a rock-bound lithic assemblage, offers the unique chance to elucidate various bioweathering processes that occur simultaneously. Here, we present a bioweathering scenario of this biocenosis including processes such as penetration of the lithomatrix, microbial responses to wet-dry cycles, alkalinolysis, enzyme activity, and mineral re-localization. Frequently occurring fog, for example, led to a volume increase of microorganisms and the lithomatrix. This, together with pH shifts and dust accumulation, consequently results in biophysical breakdown and the formation of a terrestrial protopedon, an initial stage of pedogenesis fueled by the grit crust. KW - Earth sciences KW - Geomicrobiology KW - Earth-Surface Processes KW - Weathering KW - Biogeoscience Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1016/j.isci.2020.101647 SN - 2589-0042 VL - 23 IS - 11 SP - 1 EP - 29 ER -