Fig. 9From: Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial communityThe abundance of specific enzymes or pathways involved in energy conservation and metabolism in Ace Lake. Heat map depicting the normalized abundance of specific enzymes or pathways (x-axis) by season (left-hand y-axis: summer, red; winter, blue; spring, green) and by depth (right-hand y-axis: U1 to L3). Each sampling date (left-hand y-axis) displays abundances for each of the three filter fractions: top, 20–3 μm; middle, 3–0.8 μm; bottom, 0.8–0.1 μm. The gradient bar shows the colour scale used for the normalized abundance of the enzyme or pathway. Depths: U1, upper 1; U2, upper 2; U3, upper 3; I, interface; L1, lower 1; L2, lower 2; L3, lower 3 (see Additional file 1: Table S1 for specific information about sampled depths). BCAA ABC transporter, branched-chain amino acid ATP-binding cassette transporter; Cas, CRISPR-associated; CBB cycle, Calvin-Benson-Bassham cycle; CRISPR, clustered regularly interspaced short palindromic repeats; DMSP, dimethylsulfoniopropionate; DNRA, dissimilatory nitrate reduction to ammonium; PHA, polyhydroxyalkanoate; reverse TCA cycle, reverse tricarboxylic acid cycle; SOX system, sulfur-oxidizing system; TMA, trimethylamine; Type 1 RC core complex (GSB), Type 1 reaction centre core complex (green sulfur bacteria)Back to article page