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Clownfishes evolution below and above the species level.

Jonathan Rolland1,2,3, Daniele Silvestro4,2,5,6, Glenn Litsios4,2

  • 1Department of Computational Biology, University of Lausanne, Biophore, Quartier-Sorge, 1015 Lausanne, Switzerland jonathan.rolland@yahoo.fr.

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Evolutionary rates within populations can predict species-level changes. Similar selective pressures on rhodopsin genes occur at both microevolutionary and macroevolutionary scales in clownfish.

Keywords:
RH1interspecificintraspecificmacroevolutionmicroevolutionpositive selection

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular biology

Background:

  • The discrepancy between rapid microevolutionary changes and macroevolutionary stasis is debated.
  • Microevolution and macroevolution are rarely studied together, hindering understanding of evolutionary processes.

Purpose of the Study:

  • To investigate the relationship between intraspecific mechanisms and interspecific evolution.
  • To compare evolutionary rates and selective pressures across different evolutionary scales in clownfish.

Main Methods:

  • Analysis of morphological, genetic, and ecological traits in clownfish populations.
  • Estimation of parameters like effective population size and intraspecific evolutionary rates.
  • Identification of selective pressures on the rhodopsin RH1 gene.

Main Results:

  • Species-level evolutionary tempo can be predicted by parameters from below the species level.
  • Similar codons in the rhodopsin RH1 gene are under positive selection at both intra- and interspecific scales.
  • Evidence suggests consistent selective pressures acting across different evolutionary scales.

Conclusions:

  • Intraspecific factors significantly influence macroevolutionary patterns.
  • Selective pressures on key genes like rhodopsin are conserved across evolutionary scales.
  • This study bridges the gap between micro- and macroevolutionary research.