Figure 8.

Phylogenetic analysis of archaeal 16S rRNA genes (a) retrieved from ¹³C-CO₂ DNA-SIP heavy fractions (HF) and light fractions (LF) of HZ soil microcosms incubated for 30 days, and thaumarchaeal amoA genes (b) derived from eight DGGE bands in the heavy fractions around a buoyant density of 1.73 g ml⁻¹ from the HZ soil incubated for 30 days. The sequences for the HF and LF were highlighted in red and blue, respectively. HF-Archaea-clone-3-(19) indicates that 19 clones showed above 98% similarities to the clone-3. Bootstrap values (>50%) are indicated at branch points. The scale bar represents 2% and 5% nucleic acid sequence divergence for archaeal 16S rRNA genes and thaumarchael amoA genes, respectively. The letters M and S represent Marine Lineage and Soil and Sediment Lineage, respectively.