This knowledge may have important consequences in environmental conservation efforts to protect endangered turtle species. Some other conditions, e. Journal of Heredity.
Nottingham: Nottingham University Press. New Jersey: Prentice Hall, Aromatase helps to convert sex steroids, a group of hormones that influence sex development and reproduction, from male sex hormones androgens to female sex hormones estrogens. In the s, David Crews, a biologist at the University of Texas at Austinand colleagues found that some environmental pollutants caused sex-altering effects in turtles and other reptiles.
Finally, practical applications of this research have emerged for temperature dependent sex determination animals martin in Stourbridge conservation and restoration of endangered egg-laying reptiles as well as the embryonic development of reptiles as biomarkers to monitor the estrogenic effects of common environmental contaminants.
Nicole Valenzuela and Valentine Lance, 21— New Jersey: Pearson Education, Abstract In many egg-laying reptiles, the incubation temperature of the egg determines the sex of the offspring, a process known as temperature-dependent sex determination TSD. Research Support, U.
The results, which found evidence of TSD in four out of five species, confirmed that some vertebrate species exhibit TSD. Over the next two decades, scientists worked to test mechanisms of sex differentiation in more species and to pinpoint pivotal temperatures, which are species-specific temperature ranges in which males and females are produced in equal number.
Charnier published her results in the meeting records of the local Society of Biology in West Africa, a journal with limited distribution, and her efforts were not widely recognized for several years. However, to elicit a sex-ratio response to temperature, past experiments were often conducted only in the laboratory and not in the field, and the temperatures used were beyond the natural range of temperatures that the species experience in nature.
PLOS One. This phase is followed by the degeneration of the male reproductive system and a period of lability. Archived from the original on