FIG. 1.

Frequency of reads corresponding to gene markers for biochemical cycles. Red mat is shown in red bars while green mat is shown in green bars. Genes correspond to the following proteins: phnD and ptxB (phosphonate transporters), phnH and htxB (C-P lyase), ppA (pyrophosphatase), ppK (polyphosphatase kinase), ppX (exopolyphosphatase), phoA and phoX (alkaline phosphatases), pstS (phosphate transporter), rbcL and rbcS (RuBisCO), codH (CO dehydrogenase), aclY (citrate lyase), nifH (nitrogenase reductase), nrfA (nitrite reductase), narG (nitrate reductase), napA (nitrate reductase), narB (nitrate reductase), nirS (nitrite reductase), norB (nitric oxide reductase), and nosZ (nitrous oxide reductase). Color images available online at www.liebertpub.com/ast