An alternative hypothesis of adaptive significance was proposed by Bulmer and Bull in  and supported by the work of Pen et al. Ohno, Susumu. The threshold temperature at which the sex ratio is even is Turtle species that display TSD are thought to follow one of two patterns of temperature dependence.
Proceedings of the Royal Society B. Charles Deeming. Basic Ecology Studies Implementing effective conservation strategies for any species requires a thorough understanding of its natural history.
Sources Bull, James. Retrieved April 16, — via ETI. Journal of Heredity. The production of sex hormones can result solely from genetics or from genetics in combination with the influence of environmental factors.
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While aromatase activity remains low for much of development in individuals that exhibit TSD, during the thermosensitive period, variations in temperature increase the activity of aromatase. Similarly, injecting eggs with inhibitors of estrogen synthesis will produce male offspring, even if the eggs are incubated at temperatures that usually produce females Dorizzi et al.
For instance, polychlorinated biphenyls PCBs are pollutants whose molecules are structurally similar to some estrogens. Sex determination and differentiation. This project sterilized genetically hybridized tortoises so that they could be released onto the islands to function as ecologically important large herbivores until genetically pure tortoises can be reestablished.