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Related Experiment Videos

Shifting barriers and phenotypic diversification by hybridisation.

Kristina M Sefc1, Karin Mattersdorfer1, Angelika Ziegelbecker1

  • 1Institute of Zoology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria.

Ecology Letters
|April 7, 2017
PubMed
Summary

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Hybridization can create new species through changing dispersal barriers, not just ecological differences. This study shows how shifting barriers led to a new yellow cichlid variant in the African Great Lakes.

Area of Science:

  • Evolutionary biology
  • Speciation mechanisms
  • Genetics and genomics

Background:

  • Hybrid taxa typically arise through reproductive isolation driven by ecological differentiation.
  • The African Great Lakes harbor diverse cichlid species with geographic color variations.
  • Ancient lake level fluctuations have historically restructured cichlid habitats.

Purpose of the Study:

  • To explore an alternative mechanism for hybrid taxa establishment: shifts in dispersal barriers.
  • To investigate the role of geographic separation in cichlid diversification via hybridization.
  • To determine the origin of a distinct yellow-colored variant of Tropheus moorii.

Main Methods:

  • Analysis of genetic data from cichlid populations.
  • Conducting experimental crosses between different cichlid variants.
Keywords:
Carotenoid colorationCichlidaeLake TanganyikaTropheusclimate changecolour patternenvironmental fluctuationsgenetic admixturehybrid speciationmate choice

Related Experiment Videos

  • Integration of paleolimnological data with genetic findings.

    • Main Results:

    • Genetic data and experimental crosses support a hybrid origin for the yellow Tropheus moorii variant.
    • This variant resulted from ancient admixture between allopatric red and bluish Tropheus moorii.
    • Reproductive isolation is maintained by geographic separation due to weak assortative mating.

    Conclusions:

    • Dispersal barrier dynamics can drive diversification through hybridization.
    • The yellow Tropheus moorii variant exemplifies a diversification process influenced by geographic isolation.
    • Selective neutrality governed by dispersal barrier rearrangements shapes cichlid diversification.