Marine Biology

, Volume 121, Issue 3, pp 477–485

Evolutionary relationships among deep-sea mytilids (Bivalvia: Mytilidae) from hydrothermal vents and cold-water methane/sulfide seeps

  • C. Craddock
  • W. R. Hoeh
  • R. G. Gustafson
  • R. A. Lutz
  • J. Hashimoto
  • R. J. Vrijenhoek
Article

Abstract

A protein electrophoretic survey of mytilids inhabiting deep-sea hydrothermal vents and cold-water methane/sulfide seeps revealed electromorph patterns diagnostic of 10 distinct species. From hydrothermal vents located at sites on the Galápagos Rift, the Mid-Atlantic Ridge, and the Mariana Back Arc Basin, we detected four species of mytilids. Six additional species were detected from three cold-water seep sides in the Gulf of Mexico. The patchy distribution and temporal stability of seeps may provide a greater opportunity for mytilid diversification and persistence than vent sites Nei's genetic distances (D) between species were relatively large (range: 0.528 to ∞) both within and among habitat types. This pronounced degree of genetic differentiation suggests a relatively ancient common ancestor for the group. Phylogenetic trees were generated using distance Wagner and parsimony analyses of allozyme and morphological characters. The tree topologies obtained from both methods support: (1) the hypothesis that a seep ancestor gave rise to the deep-sea hydrothermal vent mytilids, (2) a historical progression from shallow-water to deep-water habitats, and (3) a co-evolutionary progression from external to internal localization of bacterial symbionts. Whether the seep mytilid taxa constitute paraphyletic or polyphyletic groups remains unresolved. Our phylogenetic hypotheses also provide a benchmark for the phylogeny of mytilid bacterial symbionts.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • C. Craddock
    • 1
  • W. R. Hoeh
    • 1
  • R. G. Gustafson
    • 1
  • R. A. Lutz
    • 1
  • J. Hashimoto
    • 2
  • R. J. Vrijenhoek
    • 1
  1. 1.Center for Theoretical and Applied Genetics, and Institute of Marine and Coastal SciencesRutgers UniversityNew BrunswickUSA
  2. 2.Japan Marine Science and Technology CenterYokosukaJapan

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