On the occasion of the 10-year anniversary of Frontiers in Microbiology, this Research Topic
was launched to highlight the linkages between extreme and archaeal microbiology (Teske,
2020). Archaea adapt to the physical and chemical characteristics of their habitat—such as organic matter availability, electron donor redox status, salinity, temperature, and pH—in terms of metabolic activity, community composition, gene expression patterns, and evolutionary diversification (Baker et al., 2020). Here, cultivation-and genome-based studies …