They will return to the same feeding grounds again and again for decades. The huge variation and complexity in sex determination mechanisms among reptile species are due to multiple transitions between modes, such as GSD and TSD, that have occurred during evolution Sarre et al.
But none of that work examines populations on a scale that even comes close to Jensen's temperature-dependent sex determination and gonadal differentiation in reptiles in Rochdale Allen's work. In the Chagos Archipelago in the west Indian Ocean, heavy bouts of sand-cooling rains, shade from the leaves of coastal trees, and narrow beaches that force hawksbills to nest close to water help maintain a healthy ratio of male hatchlings.
Global Change Biology.
This disorganization can be rescued by co-application of either testosterone or estradiol with flutamide, indicating a possible role for androgen signaling in sex-specific aromatase action in ovarian development. Exogenous estrogen treatment during development will transiently sex-reverse chickens [ 18 ], and permanently sex-reverse reptiles, amphibians, and fish [ 19 — 22 ].
Scheib D. Hatchlings from single-sex producing temperatures also had higher first-year survivorship than the hatchlings from the temperature temperature-dependent sex determination and gonadal differentiation in reptiles in Rochdale produces both sexes.
BMC Developmental Biology. Steroidogenic factor 1 Sf1 has multiple roles during sexual development across vertebrate groups, including the regulation of aromatase [ 93 — 96 ]. Nottingham: Nottingham University Press. Aromatase enzyme activity during gonadal sex differentiation in alligator embryos.
Here we build a model for TSD wherein warm temperatures either directly or indirectly cause increased estrogen production within the gonad that in turn directs ovarian development while inhibiting testis-specific gene expression. Other work centers on a theoretical model the Charnov — Bull model  predicted that selection should favour TSD over chromosome -based systems when "the developmental environment differentially temperature-dependent sex determination and gonadal differentiation in reptiles in Rochdale male versus female fitness";  this theoretical model was empirically validated thirty years later  but the generality of this hypothesis in reptiles is questioned.
While TSD has been observed in many reptile and fish species, the genetic differences between sexes and molecular mechanisms of TSD have not been determined. Proceedings of the Royal Society B. Studying the spotted skink, they observed that the highland population was not affected by temperature, yet, there was a negative correlation between annual temperature and cohort sex ratios in the lowlands.