Assessment of patterns of temperature-dependent sex determination using maximum likelihood model selection

Godfrey, Matthew H.; Delmas, Virginie; Girondot, Marc

doi:10.1080/11956860.2003.11682773

Cited by 42 publications

(71 citation statements)

References 21 publications

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“…The diversification of sex determination seems to be easily induced, and even the same species (e.g. yellow mud turtle, Kinosternon flavescens ) can display an alternative TSD pattern (at least alterative response to temperature) in different geographical population [Ewert et al, 1994;Godfrey et al, 2003]. These observations indicate significant variation in reptilian sex determination, and the frequent transition between TSD and GSD points towards malleable properties in the mechanisms associated with sex determination in this group.…”

Section: Evolution Of Sex Determination Systemsmentioning

confidence: 87%

“…More recently, restriction site-associated DNA sequencing has been applied to discover allelic differences showing a strong association to a specific sex [Chapus and Edwards, 2009]. In addition, potential effects of incubation temperature on sex determination and the pattern of TSD can be identified by the maximum likelihood model selection [Godfrey et al, 2003].…”

Section: Evolution Of Sex Determination Systemsmentioning

confidence: 99%

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Gonadal Differentiation in Reptiles Exhibiting Environmental Sex Determination

Kohno¹,

Parrott²,

Yatsu³

et al. 2014

Sex Dev

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As temperature-dependent sex determination (TSD) and homozygote or heterozygote genetic sex determination (GSD) exist in multiple reptilian taxa, they represent sex determination systems that have emerged de novo. Current investigations have revealed that the genetic mechanisms used by various reptilian species are similar to those used by other vertebrates. However, the recent completion or near completion of various reptilian genome projects suggests that new studies examining related species with and without TSD could begin to provide additional insight into the evolution of TSD and GSD in vertebrate ancestors. Major questions still remain concerning germ cell migration and specification, the differentiation of gonadal accessory cells, such as the Sertoli cells and granulosa cells of the developing testis and ovary, respectively, and the mechanisms by which gene expression is regulated during TSD events. Further, reptilian sentinels and their mechanisms of gonadogenesis will likely remain important indicator species for environmental health. Thus, ongoing and new investigations need to tie molecular information to gonadal morphogenesis and function in reptiles. Such data will not only provide important information for an understanding of the evolution of these phenomena in vertebrates, but could also provide an important understanding of the health of the environment around us.

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Section: Evolution Of Sex Determination Systemsmentioning

confidence: 87%

Section: Evolution Of Sex Determination Systemsmentioning

confidence: 99%

Gonadal Differentiation in Reptiles Exhibiting Environmental Sex Determination

Kohno¹,

Parrott²,

Yatsu³

et al. 2014

Sex Dev

View full text Add to dashboard Cite

show abstract

“…For a more precise description of parameters, see Godfrey et al (2003). In the second model (named K fix ), we assumed a potential asymmetry around the inflexion point of the sigmoid.…”

Section: Tsd Reaction Normmentioning

confidence: 99%

“…To describe the reaction norm (i.e., the sex ratios produced under constant incubation temperatures) for studied populations, we used two mathematical models developed by Girondot (1999) and Godfrey et al (2003), and one new model. All models are based on equations with sigmoid shapes.…”

Section: Tsd Reaction Normmentioning

confidence: 99%

Temperature-dependent sex determination and global change: are some species at greater risk?

et al. 2009

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In species with temperature-dependent sex determination (TSD), global climate change may result in a strong sex ratio bias that could lead to extinction. The relationship between sex ratio and egg incubation at constant temperature in TSD species is characterized by two parameters: the pivotal temperature (P) and the transitional range of temperature that produces both sexes (TRT). Here, we show that the proportion of nests producing both sexes is positively correlated to the width of the TRT by a correlative approach from sex ratio data collected in the literature and by simulations of TSD using a mechanistic model. From our analyses, we predict that species with a larger TRT should be more likely to evolve in response to new thermal conditions, thus putting them at lower risk to global change.

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“…The relationship has been fitted successively using a logistic equation [Girondot, 1999] for pattern MF or FM or the product of 2 modified logistic equations to render FMF pattern [Godfrey et al, 2003]. Recently, we expanded this work to all the species studied so far and we search particularly to estimate if asymmetrical response of sex ratio around pivotal temperature (P) is observed (i.e.…”

Section: Constant Temperatures and Sex Ratiomentioning

confidence: 99%

Modeling Thermal Influence on Animal Growth and Sex Determination in Reptiles: Being Closer to the Target Gives New Views

Girondot

Hassine²,

Sellos

et al. 2010

Sex Dev

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Many species of oviparous reptiles, including crocodilians, a majority of turtles, some lizards and the 2 closely related species of Sphenodon have been shown to display temperature-dependent sex determination (TSD). Whereas it has been demonstrated very early that TSD also occurs in natural conditions, the relationship between a time series of changing temperatures and sex ratio remains a challenging problem for reptiles. We describe how a physiological model of embryo growth, gonadal development and aromatase activity can produce outputs that mimic well TSD. We provide an enhancement of a previously published model taking into account direct effect of temperature on aromatase activity. The comparison between the original model and the new one suggests that aromatase expression is controlled by a repressor factor expressed at masculinizing temperatures rather than its enhancement at feminizing temperatures.

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Assessment of patterns of temperature-dependent sex determination using maximum likelihood model selection

Cited by 42 publications

References 21 publications

Gonadal Differentiation in Reptiles Exhibiting Environmental Sex Determination

Gonadal Differentiation in Reptiles Exhibiting Environmental Sex Determination

Temperature-dependent sex determination and global change: are some species at greater risk?

Modeling Thermal Influence on Animal Growth and Sex Determination in Reptiles: Being Closer to the Target Gives New Views

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