Fig. 1

Distribution of genes (black lines, normalized relative abundance) and their correspondence with modeled processes (gray lines, relative rate) suggest that the model captures the major factors influencing the distribution of most genes in the lake, except genes involved in sulfur cycling. Modeled rates are identical to those published in a previous analysis, which were not calibrated to match gene distributions. Observations represent the following genes and corresponding processes: a nosZ genes with associated modeled processes heterotrophic and autotrophic denitrification, combined; b genes involved in iron reduction in Geobacter and Rhodoferax and modeled heterotrophic iron reduction; c dsrB genes and modeled heterotrophic sulfate reduction and autotrophic sulfide oxidation, combined; d pmoABC genes and modeled methane oxidation and nitrification, combined; e hoa genes and modeled nitrification; and f mxaG genes and modeled methane oxidation (using both oxygen and sulfate)