Dispersal barriers and isolation among deep-sea mussel populations (Mytilidae: Bathymodiolus) from eastern Pacific hydrothermal vents

Y. Won, C. R. Young, R. A. Lutz, R. C. Vrijenhoek

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

Deep-sea hydrothermal vent species are widely dispersed among habitat islands found along the global mid-ocean ridge system. We examine factors that affect population structure, gene flow and isolation in vent-endemic mussels of the genus Bathymodiolus from the eastern Pacific Ocean. Mussels were sampled from localities including the Galapagos Rift (GAR, 0°48′ N; 86°10′ W) and the East Pacific Rise (EPR, 13° N to 32° S latitude) across a maximum distance of 4900 km. The sampled range crossed a series of topographical features that interrupt linear aspects of the ridge system, and it encompassed regions of strong cross-axis currents that could impede along-axis dispersal of mussel larvae. Examinations of mitochondrial DNA sequences and allozyme variation revealed significant barriers to gene flow along the ridge axis. All populations from the GAR and EPR from 13° N to 11° S were homogeneous genetically and appeared to experience unimpeded high levels of inter-populational gene flow. In contrast, mussels from north and south of the Easter Microplate were highly divergent (4.4%), possibly comprising sister-species that diverged after formation of the microplate ≈ 4.5 Ma. Strong cross-axis currents associated with inflated bathymetry of the microplate region may reinforce isolation across this region.

Original languageEnglish (US)
Pages (from-to)169-184
Number of pages16
JournalMolecular Ecology
Volume12
Issue number1
DOIs
StatePublished - Jan 1 2003

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

Keywords

  • Allozymes
  • East Pacific Rise
  • Gene flow
  • Mitochondrial DNA
  • Speciation

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