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Inversion polymorphisms and natural selection in Trimerotropis pallidipennis (Orthoptera).

P C Colombo1

  • 1Depto Cs. Biológicas, FCEN, UBA, Ciudad Universitaria, Buenos Aires, Argentina. colombop@bg.fcen.uba.ar

Hereditas
|December 4, 2003
PubMed
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In grasshoppers, pericentric inversions influence adult male longevity and reveal natural selection in wild populations. This study on Trimerotropis pallidipennis demonstrates karyotype-specific survival differences.

Area of Science:

  • Evolutionary genetics
  • Population genetics
  • Insect biology

Background:

  • Inversion polymorphisms are common in grasshoppers but less studied than in Drosophila.
  • Trimerotropis pallidipennis exhibits polymorphism for 6 pericentric inversions across 4 chromosome pairs.

Purpose of the Study:

  • To detect differential adult male longevity among karyotypes in Trimerotropis pallidipennis.
  • To identify phenotypic targets of longevity selection related to inversions.
  • To investigate natural selection acting on inversion polymorphisms in a wild population.

Main Methods:

  • Sampling 354 males from a natural population at the beginning and end of their adult lifespan.
  • Analyzing karyotype frequencies across different age classes to detect selection.

Related Experiment Videos

  • Examining morphometric characters to link inversions with longevity selection.

    • Main Results:

    • Significant differences in inversion frequencies between young and aged male samples indicate natural selection.
    • Gametic phase disequilibrium was observed in aged males but not in young males.
    • Inversions are implicated in natural selection, with evidence supporting an adaptive model for inversion frequency patterns.

    Conclusions:

    • Pericentric inversions in Trimerotropis pallidipennis are subject to natural selection affecting adult male longevity.
    • The study provides evidence for karyotype-specific survival and phenotypic associations with inversions.
    • Findings support an adaptive role for inversion polymorphisms in grasshopper populations across varying environments.