Fig. 5

Visualizations of metagenomic samples analysing results. a This bar plot displays the top ten significantly different protein families among eight given samples. The frequencies of PF00072, PF00144, PF00872 in eight samples are dramatically fluctuated. b Hierarchical clustering dendrogram of eight given samples. c Multi-dimensional scaling map of eight given samples. Obviously, three samples from Sargasso Sea as well as three whale fall samples are grouped respectively; Minnesota farm soil and AMD samples are separated from Sargasso Sea samples and whale fall samples in both phylogenetic view and multi-dimensional distance. d The heat-map of eight given samples. This figure demonstrates our conclusion mentioned above through the similarity of relative gene abundance among eight samples