Molecular phylogenetics of bacterial endosymbionts and their vestimentiferan hosts

Robert A. Feldman, Michael B. Black, Craig S. Cary, Richard A. Lutz, Robert C. Vrijenhoek

Research output: Contribution to journalArticlepeer-review

78 Scopus citations


Vestimentiferan tube worms from deep-sea hydrothermal vents and cold-water seeps rely entirely on sulfur-oxidizing bacterial endosymbionts for nutriment. We examined host-symbiont co-evolution by comparing phylogenetic trees from symbiont 16S ribosomal DNA and host mitochondrial COI genes. The endosymbionts comprised two distinct clades, one associated with tube worms from basaltic vent habitats and the other associated with tube worms from sedimented seep-like environments. Within each symbiont clade, 16S rDNA sequences were nearly identical, suggesting that vent vestimentiferans share a single endosymbiont species that is distinct from the seep endosymbiont species. A third endosymbiont type, related to the seep species, was found in a tube worm collected from a whale carcass. Our results are consistent with a horizontal model of symbiont transmission.

Original languageEnglish (US)
Pages (from-to)268-277
Number of pages10
JournalMolecular Marine Biology and Biotechnology
Issue number3
StatePublished - Sep 1997

All Science Journal Classification (ASJC) codes

  • Applied Microbiology and Biotechnology


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