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Related Experiment Video

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Manipulation of Ploidy in Caenorhabditis elegans
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Comparative analysis reveals that polyploidy does not decelerate diversification in fish.

S H Zhan1, L Glick, C S Tsigenopoulos

  • 1University of British Columbia, Vancouver, BC, Canada.

Journal of Evolutionary Biology
|January 15, 2014
PubMed
Summary
This summary is machine-generated.

Polyploidy, or having multiple sets of chromosomes, does not generally decrease fish diversification rates, unlike in plants. This suggests varied evolutionary impacts of genome duplication across different life forms.

Keywords:
AcipenseridaeBotiidaeCyprinidaeSalmoniformesbinary state speciation and extinctionchromosome numberteleost fish

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Ichthyology

Background:

  • The evolutionary success of teleost fish is linked to ancient genome duplication, but the role of polyploidy in fish diversification is unclear.
  • Polyploidy's impact on diversification is well-studied in plants, but less understood in animals, particularly fish.

Purpose of the Study:

  • To investigate the association between polyploidy and diversification rates in diverse fish lineages.
  • To compare diversification patterns of polyploid and diploid fish across different taxonomic levels.

Main Methods:

  • Utilized likelihood-based evolutionary methods to co-estimate speciation and extinction rates.
  • Analyzed diversification in sturgeons (Acipenseridae), botiid loaches (Botiidae), Cyprininae fishes, and salmonids (Salmonidae).
  • Compared polyploid fish lineages with their diploid relatives and sister clades.

Main Results:

  • No significant difference in diversification rates between polyploid and diploid sturgeons and botiid loaches.
  • Higher polyploid diversification observed in Cyprininae fishes.
  • No significant difference in net diversification rates between polyploid Salmoniformes and diploid Esociformes.

Conclusions:

  • Polyploidy is generally not associated with decreased diversification in fish, contrasting with patterns in plants.
  • Polyploidy may influence diversification differently across major eukaryotic lineages, such as fish and plants.