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Related Experiment Videos

Ejaculate-female coevolution in Drosophila mojavensis.

Scott Pitnick1, Gary T Miller, Karin Schneider

  • 1Department of Biology, Syracuse University, 108 College Place, Syracuse, NY 13244-1270, USA. sspitnic@syr.edu

Proceedings. Biological Sciences
|September 11, 2003
PubMed
Summary

Sperm and reproductive trait evolution in Drosophila mojavensis provides evidence for rapid speciation. Coevolving male and female traits drive reproductive isolation, supporting the hypothesis that sexual selection is a key engine of speciation.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Reproductive biology

Background:

  • Sperm morphology and ejaculatory traits diverge rapidly in Drosophila, often attributed to postcopulatory sexual selection.
  • This rapid divergence is hypothesized to be a primary driver of reproductive isolation and speciation.

Purpose of the Study:

  • To test if reproductive traits vary significantly among incipient species.
  • To investigate if sex-specific traits exhibit coevolutionary patterns within a species undergoing early speciation.

Main Methods:

  • Examined geographical variation in Drosophila mojavensis populations.
  • Measured sperm length and female sperm-storage organ length.
  • Conducted crosses to analyze male and female contributions to egg size.

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Main Results:

  • Identified significant variation in sperm length and female sperm-storage organ length among populations.
  • Observed a strong pattern of correlated evolution between these interacting reproductive traits.
  • Found evidence of coevolution in male and female contributions to egg size.

Conclusions:

  • Coevolving internal reproductive characters play a significant role in speciation.
  • Supports the hypothesis that postcopulatory sexual selection drives rapid reproductive isolation and speciation.