The adaptive significance of temperature-dependent sex determination in a reptile

Nature
Daniel A Warner, Richard Shine

Abstract

Understanding the mechanisms that determine an individual's sex remains a primary challenge for evolutionary biology. Chromosome-based systems (genotypic sex determination) that generate roughly equal numbers of sons and daughters accord with theory, but the adaptive significance of environmental sex determination (that is, when embryonic environmental conditions determine offspring sex, ESD) is a major unsolved problem. Theoretical models predict that selection should favour ESD over genotypic sex determination when the developmental environment differentially influences male versus female fitness (that is, the Charnov-Bull model), but empirical evidence for this hypothesis remains elusive in amniote vertebrates--the clade in which ESD is most prevalent. Here we provide the first substantial empirical support for this model by showing that incubation temperatures influence reproductive success of males differently than that of females in a short-lived lizard (Amphibolurus muricatus, Agamidae) with temperature-dependent sex determination. We incubated eggs at a variety of temperatures, and de-confounded sex and incubation temperature by using hormonal manipulations to embryos. We then raised lizards in field enclosures and quan...Continue Reading

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Citations

Apr 1, 2008·Journal of Biosciences·J J Bull
Oct 1, 2008·Integrative and Comparative Biology·Christopher L Organ, Daniel E Janes
Aug 24, 2013·Integrative and Comparative Biology·Janet L Leonard
Aug 30, 2008·Proceedings. Biological Sciences·Yvonne A EibyDavid T Booth
Aug 6, 2010·Proceedings. Biological Sciences·Daniel A Warner, Richard Shine
Nov 23, 2013·Proceedings. Biological Sciences·Timothy S MitchellFredric J Janzen
May 26, 2010·Conservation Biology : the Journal of the Society for Conservation Biology·Graeme C HaysMike B Gravenor
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Jun 26, 2018·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·C K Janelle So, Lisa E Schwanz

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