Phylogenic relationships between deep-sea hydrothermal vent and cold seep polychaetes of the genus Branchipolynoe (Polychaeta: Polynoidae) inferred from sequences of mitochondrial genes (16S rRNA and COI)
Chevaldonné, P.; Jollivet, D.; Feldman, R.A.; Desbruyères, D.; Lutz, R.A.; Vrijenhoek, R.C. (1997). Phylogenic relationships between deep-sea hydrothermal vent and cold seep polychaetes of the genus Branchipolynoe (Polychaeta: Polynoidae) inferred from sequences of mitochondrial genes (16S rRNA and COI), in: Biologie des sources hydrothermales profondes = Biology of deep-sea hydrothermal vents: Journées d'échanges du Programme DORSALES = DORSALES Workshop Roscoff 6-8 octobre 1997. Cahiers de Biologie Marine, 38(2): pp. 118 In: (1997). Biologie des sources hydrothermales profondes = Biology of deep-sea hydrothermal vents: Journées d'échanges du Programme DORSALES = DORSALES Workshop Roscoff 6-8 octobre 1997. Cahiers de Biologie Marine, 38(2)[s.n.][s.l.]. 111-149 pp., more In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, more |   |
| Authors | | Top | - Chevaldonné, P., more
- Jollivet, D.
- Feldman, R.A.
| - Desbruyères, D., more
- Lutz, R.A.
- Vrijenhoek, R.C.
| |
| Abstract | Polynoid polychaetes are a diverse family, particularly well represented at deep-sea hydrothermal vents and cold seeps. Many of the vent and seep species are free-living, however the genus Branchipolynoe Pettibone, 1984 occurs exclusively as a commensal in the mantle cavity of Bathymodiolus-like mytilid bivalves. Three species of Branchipolynoe have been described: B. symmytilida from the Galapagos Rift and northern East Pacific Rise (EPR) hydrothermal vent sites; B. pettibonneae from several vent areas in the western Pacific; and B. seepensis from cold seepage areas of the Gulf of Mexico. Commensal polynoids occurring in mytilids at hydrother-mal vents of the Mid-Atlantic Ridge (MAR) are also assigned to B. seepensis based on morphological criteria. Specialized species, however, rarely occur at both vents and seeps, and there has been a growing suspicion that cryptic speciation has occurred between MAR commensals and Gulf of Mexico B.seepensis. We have attempted to resolve the pattern of phylogenetic relationships within this genus, by analysing DNA sequences. Specimens of Branchipolynoe were collected from several different localities on the Galapagos Rift, the East Pacific Rise, the Mid-Atlantic Ridge and the Louisiana Slope in the Gulf of Mexico. The divergence between B. seepensis from the Gulf of Mexico seeps and the commensal from the MAR was assessed in detail with the two genes, and suggests that the two forms might have been isolated long enough to become different species. Along a ridge axis, the level of differentiation within hydrothermal species of Branchipolynoe is much lower, and the effects of fast-vs. slow-spreading were compared. |
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