Fig. 2.

MRT of the interaction between archaeal lineage abundance and environmental factors. The model explained 51.1% of the variance of the whole data set. Libraries clustered in the tree leaves according to their sources (Table S1). Pie charts under each leaf indicate how the relative abundance of archaeal lineages contributed to the structure of the leaves. The IndVal index for each leaf (data not shown) revealed that most core lineages are still indicator lineages (p < 0.01), which are labeled on each pie. Abbreviation of taxonomy: Woese, Woesearchaeota; Thermpl, Thermoplasmata; SCG, Soil Crenarchaeotic Group; Tergp, Terrestrial group; MG-I, Marine Group I; UncThaum, Uncultured Thaumarchaeota; Halo, Halobacteria; Bathy-8/-6, Bathyarchaeota subgroup-8/-6; Metcoc, Methanococci; Metmic, Methanomicrobia; Metbac, Methanobacteria; SAGMCG, South African Gold Mine Group 1.