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Rangewide molecular structuring in the Utah sucker (Catostomus ardens).

K E Mock1, R P Evans, M Crawford

  • 1Department of Forest, Range, and Wildlife Sciences, Utah State University, Logan, Utah 84322-5230, USA. karen.mock@usu.edu

Molecular Ecology
|June 20, 2006
PubMed
Summary
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Genetic analysis reveals a significant subdivision within Utah suckers, separating populations in the Bonneville Basin from those in the Snake River drainage. This genetic boundary was not previously identified morphologically.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Genetics

Background:

  • The Utah sucker (Catostomus ardens) is endemic to the Bonneville Basin and upper Snake River.
  • Hybridization with the endangered June sucker (Chasmistes liorus mictus) is suspected in Utah Lake.
  • Previous studies recognized morphological variation but not major genetic subdivisions.

Purpose of the Study:

  • To investigate genetic population structure in Utah suckers.
  • To identify genetic divergence between Utah suckers and June suckers.
  • To explore the role of historical hydrology and ecological selection in shaping sucker diversity.

Main Methods:

  • Mitochondrial DNA sequencing was used to analyze genetic divergence.
  • Phylogenetic analysis was employed to reconstruct evolutionary relationships.

Related Experiment Videos

  • Morphological data was compared with genetic findings.

    • Main Results:

    • A major genetic subdivision (4.5% mitochondrial divergence) was discovered between Utah sucker populations in the Bonneville Basin and the Snake River drainage.
    • Populations east of the Wasatch Mountains clustered with Snake River populations, suggesting ancient hydrologic connections.
    • Evidence of population isolation within the Bonneville Basin, linked to Pleistocene sub-basins, was found.
    • No molecular evidence for deep divergence or hybridization between Utah and June suckers in Utah Lake was detected.

    Conclusions:

    • Morphological and molecular variation in Utah suckers do not always align, indicating different evolutionary pressures.
    • Ecological selection may be responsible for the observed morphological differences between Utah and June suckers in Utah Lake.
    • The findings highlight the complexity of species diversity, influenced by both neutral and adaptive genetic variation.