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A Genetic Polymorphism Underlying Alternative Reproductive Tactics in Eurycea Salamanders.

Yatin Kalki1, Todd W Pierson1

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Summary
This summary is machine-generated.

In the two-lined salamander, alternative reproductive tactics in males are linked to Y chromosome variations. This research identifies a Y-linked polymorphism influencing distinct male courtship and guarding behaviors.

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Y chromosomeamphibianplethodontidsex chromosomessupergene

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Herpetology

Background:

  • Alternative reproductive tactics (ARTs) are intrasexual variations in reproductive behavior.
  • While often plastic in amphibians, the two-lined salamander exhibits distinct male phenotypes with unique courtship and mate-guarding strategies.
  • The genetic basis for these divergent male tactics in *Eurycea* remains largely undescribed.

Purpose of the Study:

  • To investigate the genetic underpinnings of alternative reproductive tactics in the *Eurycea cf. wilderae* salamander.
  • To determine the mode of sex determination and identify genetic factors associated with male dimorphism.
  • To develop a method for assessing sex ratios and tactic frequencies in larval populations.

Main Methods:

  • Genome-wide SNP data generation from over 130 *Eurycea cf. wilderae* individuals.
  • Development and validation of a PCR-based genotyping assay.
  • Application of the assay to analyze larval sex ratios and male tactic frequencies.

Main Results:

  • Evidence supporting an XY sex determination system in the studied population.
  • Identification of a Y-linked polymorphism associated with alternative male reproductive tactics.
  • Characterization of sex ratios and relative frequencies of male tactics in larvae.

Conclusions:

  • The study provides evidence for Y-linked genetic control of alternative reproductive tactics in *Eurycea cf. wilderae*.
  • This finding contributes to understanding the role of sex chromosomes in complex polymorphisms.
  • Highlights the potential for supergenes and sex chromosomes in driving evolutionary divergence.