This second volume, Metagenomics in Different Habitats, covers such topics as: Viral genomes; Metagenomics studies in a variety of habitats, including marine environments and lakes, soil, and human and animal digestive tracts; Other habitats, including those involving microbiome diversity in human saliva and functional intestinal metagenomics; diversity of archaea in terrestrial hot springs; and microbial communities living at the surface of building stones; Biodegradation; Biocatalysts and natural products.