Normalized MEGAN tree at the domain level. Comparative tree view of the two metagenomes from the root to the domain level. The 0-4 cm metagenome is presented in red and the 10-15 cm metagenome in blue. The numbers in brackets give the percentage of total reads assigned to each node for the two metagenomes. The size of the individual nodes is scaled logarithmically to indicate number of reads assigned.