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Global dispersion and local diversification of the methane seep microbiome | PNAS

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Inbred sea squirt larvae (with two copies of flourescent protein genes instead of *Mesp) attached to petri dishes following their free-swimming larval stage. Credit: Lionel Christiaen*

Lionel Christiaen amputating larval tails at the base to trigger regeneration in his MBL lab in the Marine Resources Center. Credit: Sarah Lawhun

Nexus between phylogeny and function of the newly discovered nitrogen fixers in surface ocean metagenomes. (a) Phylogenomic analysis of 432 Proteobacteria genomes and 43 Planctomycetes genomes that Delmont and colleagues characterized (including the nine non-photosynthetic N fixers) using a collection of 37 phylogenetic marker gene families. Layers surrounding the phylogenomic tree indicate genome size and taxonomy of each genome at the phylum and class level. (b) Functional network of the nine non-photosynthetic N fixers based on a total of 5,912 identified gene functions. Size and color of genomic nodes represent the number of detected functions and genomic taxonomy, respectively. The color of functional nodes indicates their occurrence in the different genomes. Credit: Delmont et al (2018) Nature Microbiology, doi: 10.1038/s41564-018-0176-9