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Updated: Jun 7, 2026

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern
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Climate-driven population divergence in sex-determining systems.

Ido Pen1, Tobias Uller, Barbara Feldmeyer

  • 1Theoretical Biology Group, University of Groningen, PO Box 14, 9750 AA Haren, the Netherlands. i.r.pen@rug.nl

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|October 29, 2010
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Lizard populations at different altitudes exhibit distinct sex determination methods, driven by climate. This study explains how environmental factors shape the evolution of sex determination diversity in vertebrates.

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Area of Science:

  • Evolutionary Biology
  • Developmental Biology
  • Ecology

Background:

  • Sex determination in vertebrates exhibits diverse mechanisms, including genetic and temperature-dependent factors.
  • The evolutionary drivers behind this diversity, particularly within species, are not well understood.
  • Understanding these drivers is crucial for comprehending vertebrate evolutionary ecology.

Purpose of the Study:

  • To investigate the evolutionary causes of divergent sex determination mechanisms within a vertebrate species.
  • To determine how environmental factors, such as climate, influence sex determination strategies.
  • To develop a framework integrating developmental, ecological, and evolutionary aspects of sex determination variation.

Main Methods:

  • Comparative analysis of sex determination mechanisms (temperature-dependent vs. genotypic) across altitudinal gradients in live-bearing lizards.
  • Development and application of a theoretical model parameterized with field data to predict divergence in sex determination systems.
  • Assessment of climatic effects on lizard life history and temperature fluctuations to understand selection pressures.

Main Results:

  • Live-bearing lizards at different climatic extremes show distinct sex determination systems: temperature-dependent in lowlands and genotypic in highlands.
  • A theoretical model accurately predicts this altitudinal divergence and its impact on annual sex ratio variations.
  • Climatic effects on life history and temperature variability drive divergent natural selection on sex determination across altitudes.

Conclusions:

  • Intra-specific divergence in sex determination systems is adaptive, driven by phenotypic plasticity and ecological selection.
  • Climate acts as a key selective pressure, influencing life history and temperature fluctuations that shape sex determination.
  • This research provides a unifying framework for understanding the developmental, ecological, and evolutionary basis of vertebrate sex determination diversity.