Article 1 Community assembly 1 Deep subsurface 1 Extreme pH 1 Groundwater 1 Hard-rock aquifer 1 Microbial ecology 1 Serpentinization 1 aquifer 1 carbon 1 controlled study 1 environment 1 fluid flow 1 geochemistry 1 groundwater depletion habitat selection 1 hydrology 1 metagenomics 1 microbial community 1 microbial diversity 1 microbiology 1 nonhuman 1 pH 1 population dispersal 1 rock 1 seashore 1 serpentinization 1 stochastic model 1 time series analysis 1