Sex determination in reptiles temperature

Metrics details. Sex-determining systems may profoundly influence the ecology, behaviour and demography of animals, yet these relationships are poorly understood. Here we investigate whether species with temperature-dependent TSD and genetic sex determination GSD differ in key demographic traits, using data from species representing all major phylogenetic lineages of extant reptiles. We show that species with TSD exhibit significantly higher within-species variance in sex ratios than GSD species in three major life stages: birth or hatching, juvenility and adulthood. These results support the recent theoretical model that evolution of TSD is facilitated by sex-specific fitness benefits of developmental temperatures due to bimaturism.
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Sex determination of lizards depends on temperature

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How is the gender of some reptiles determined by temperature? - Scientific American

Some reptiles such as crocodilians and some turtles are known to display temperature-dependent sex determination TSD , where the ambient temperature of the developing eggs determines the individual's sex. The research has been published in Scientific Reports. Guillette Jr. In their research using American alligators, they found that a thermosensitive protein called TRPV4 is present within the developing alligator gonad inside the egg. Alligator TRPV4 is responsive to warm temperatures near mids, and can activate cell signaling by inducing calcium ion influx. From these results the authors demonstrate that TRPV4 may significantly influence the male gonadal sex determination pathway at a molecular level during TSD in the alligator. This is the first demonstrated report of a biomolecule associated with regulation of the very unique temperature-dependent sex determination mechanism.
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How is the gender of some reptiles determined by temperature?

The ambient temperature determines the sex of the lizard species Niveoscincus ocellatus spotted skink in low-lying regions. In more elevated areas, genetic factors determine sex. This is the conclusion of researchers headed by the Groningen professor Ido Pen. The results of the research were published by Nature online on 27 October.
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Embryonic sex determination i. Many vertebrates, including mammals, birds, amphibians, and some reptiles exhibit genotypic sex determination GSD , where males or females are produced based on the sex chromosomes that an embryo receives from its parents. However, this familiar method for determining the sex of offspring is not the only process that has evolved in vertebrates. Many species of reptiles and fish rely on environmental factors to determine the sex of embryos. Temperature is by far the most common environmental characteristic that determines sex in certain species of reptiles, but recent research has also shown that other factors e.
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