Fig. 4

Differences in COG functional categories between the two sampling sites and soil profiles

LAV, Val Lavirun; VRS, Villum Research Station; aL, active layer; pF, permafrost

The log₂-fold change (LFC) value pF vs. aL in LAV (A) and in VRS (B) is the log₂ of (gene abundance of pF/gene abundance of aL). The LFC value LAV vs. VRS is the log₂ of (gene abundance of LAV_aL/gene abundance of VRS_aL) for aL (C) and the log₂ of (gene abundance of LAV_pF/gene abundance of VRS_pF) for pF (D). For each pairwise comparison, only genes with a base mean > 20, a relative abundance > 0.005, p < 0.01, and LFC > 2.5 were selected. A list of all selected genes with their relative abundances, eggNOG classifications, and associated processes are provided in Additional file 1, Tables S5-8