Exploring the evolution of environmental sex determination, especially in reptiles

@article{Janzen2006ExploringTE,
  title={Exploring the evolution of environmental sex determination, especially in reptiles},
  author={Fredric J. Janzen and Patrick C. Phillips},
  journal={Journal of Evolutionary Biology},
  year={2006},
  volume={19}
}
Environmental sex determination has been documented in a variety of organisms for many decades and the adaptive significance of this unusual sex‐determining mechanism has been clarified empirically in most cases. In contrast, temperature‐dependent sex determination (TSD) in amniote vertebrates, first noted 40 years ago in a lizard, has defied a general satisfactory evolutionary explanation despite considerable research effort. After briefly reviewing relevant theory and prior empirical work, we… Expand
Sex Allocation and Sex Determination in Squamate Reptiles
TLDR
It is argued that sex allocation theory is fundamental for understanding the selective causes of evolutionary shifts in sex determination, and a range of short-lived taxa that exhibit both genetic sex determination and environment-/temperature-dependent sex determination will provide considerable insights into the integrated fields of sex allocation biology and sex determination. Expand
Environmental Control of Sex Determination and Differentiation in Reptiles
TLDR
The general background and recent advancements for TSD research in reptiles is discussed and factors triggering the intrinsic genetic cascade, which leads either to development of a testis or ovary are discussed. Expand
The adaptive significance of temperature-dependent sex determination in a reptile
TLDR
The first substantial empirical support for the Charnov–Bull model for the adaptive significance of temperature-dependent sex determination in amniote vertebrates is provided by showing that incubation temperatures influence reproductive success of males differently than that of females in a short-lived lizard with temperature- dependent sex determination. Expand
Transitions between sex-determining systems in reptiles and amphibians.
TLDR
It is apparent that transitions between modes have occurred many times, as they have for amphibians (particularly between male and female heterogamety), and it is likely that thermosensitivity in sex determination is a key factor in those transitions in reptiles, and possibly in amphibians too. Expand
Chapter 1 Sex Determination in Reptiles
The sex-determining mechanisms (SDMs) of reptiles are remarkably diverse, ranging from systems that are under complete genetic control to those that are highly dependent upon temperatures thatExpand
Sex Determination in Reptiles
TLDR
The goal of this chapter is to integrate studies from different disciplines to broadly summarize the current understanding of reptilian sex determination and identify gaps in knowledge and provide suggestions for future research. Expand
Did Lizards Follow Unique Pathways in Sex Chromosome Evolution?
TLDR
It is speculated that sex determination sensu sex chromosome evolution is labile and rapid and largely follows independent trajectories within lizards, facilitating unique evolutionary pathways. Expand
A novel hypothesis for the adaptive maintenance of environmental sex determination in a turtle
  • R. Spencer, F. Janzen
  • Biology, Medicine
  • Proceedings of the Royal Society B: Biological Sciences
  • 2014
TLDR
Hatchlings from mixed-sex nests exhibited similar sex-specific trends and they were less energy efficient and grew less than same-sex hatchlings that originated from single-sex clutches, suggesting sex- and incubation-specific physiological adaptation to winter temperatures may enhance fitness and even extend the northern range of many species that overwinter terrestrially. Expand
Windows of embryonic sexual lability in two lizard species with environmental sex determination.
TLDR
The hypothesis that TSD evolves because it enables offspring sex to be matched to conditions that are unpredictable at the time of laying is less likely to apply to squamates than to turtles, sphenodontians, and (especially) crocodiles, in which the period of sexual lability is delayed until long after oviposition. Expand
Climate-driven population divergence in sex-determining systems
TLDR
The results establish an adaptive explanation for intra-specific divergence in sex-determining systems driven by phenotypic plasticity and ecological selection, thereby providing a unifying framework for integrating the developmental, ecological and evolutionary basis for variation in vertebrate sex determination. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 53 REFERENCES
Environmental Sex Determination in Reptiles: Ecology, Evolution, and Experimental Design
TLDR
Physiological investigations of TSD have clarified the roles of steroid hormones, various enzymes, and H-Y antigen in sexual differentiation, whereas molecular studies have identified several plausible candidates for sex-determining genes in species with TSD. Expand
EXPERIMENTAL EVIDENCE FOR THE EVOLUTIONARY SIGNIFICANCE OF TEMPERATURE‐DEPENDENT SEX DETERMINATION
  • F. Janzen
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1995
TLDR
The effects of the gender × incubation temperature interaction on survivorship of hatchling turtles observed in the field experiment may have been mediated by temperature‐dependent antipredator behavior. Expand
THE ADAPTIVE SIGNIFICANCE OF TEMPERATURE-DEPENDENT SEX DETERMINATION: EXPERIMENTAL TESTS WITH A SHORT-LIVED LIZARD
TLDR
Hatching early in the season massively enhanced body size at the beginning of the first winter, albeit with a significant decline in probability of survival, although this effect may well differ between the sexes. Expand
Repeatability of microenvironment-specific nesting behaviour in a turtle with environmental sex determination
TLDR
A multiyear field study of nesting behaviour in painted turtles shows a significant field repeatability for overstory vegetation cover around nests at oviposition, which confirms a crucial assumption of models concerning the microevolution and adaptive significance of TSD in reptiles. Expand
Sex-determining mechanisms in squamate reptiles
TLDR
The sex-determining mechanisms of squamate reptiles are poorly known, relative to the large number of species in the group; only 16% of these species have been karyotyped (Olmo, '861), and the effects of multi-temperature incubations have been examined in only a few species. Expand
Environmental sex determination in a reptile varies seasonally and with yolk hormones
TLDR
The association of maternally derived yolk hormone levels with the offspring sex ratio is demonstrated and two new aspects of temperaturedependent sex determination (TSD) are described, i.e. seasonal variation in both thermal response and yolk steroid levels. Expand
How Rapidly Can Maternal Behavior Affecting Primary Sex Ratio Evolve in a Reptile with Environmental Sex Determination?
  • C. Morjan
  • Biology, Medicine
  • The American Naturalist
  • 2003
TLDR
It is predicted that females have relatively low potential to adaptively adjust sex ratios through nest‐site choice because of large climatic effects on nest temperatures and indirect selection on maternally expressed traits. Expand
SEX RATIOS AND CONDITIONS REQUIRED FOR ENVIRONMENTAL SEX DETERMINATION IN ANIMALS
  • H. Korpelainen
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical Society
  • 1990
TLDR
Both environmental and genotypic sex determination mechanisms are found in closely related species and evidence of geographical variation in the degree and in the critical environmental values of ESD within the same species has also been discovered. Expand
Adaptive significance of environmental sex determination in an amphipod
TLDR
The relationship between size and fitness for both males and females, in a population of G. duebeni, an amphipod known to have ESD, was investigated, and the adaptive explanation for the evolution and maintenance of ESD in this species was supported. Expand
Nest-site philopatry and the evolution of temperature-dependent sex determination
TLDR
An initial empirical evaluation of several assumptions and predictions of this hypothesis as applied to painted turtles using data from five consecutive nesting seasons, on a major nesting beach found that Reinhold’s hypothesis is not applicable to C. picta at the level studied because most of the essential conditions were not met. Expand
...
1
2
3
4
5
...