Incubation temperature influences sex-steroid levels in juvenile red-eared slider turtles, Trachemys scripta, a species with temperature-dependent sex determination.
Incubation temperature influences sex-steroid levels in juvenile red-eared slider turtles, Trachemys scripta, a species with temperature-dependent sex determination.
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孵化温度会影响幼年红耳龟（Trachemys scripta）的性类固醇水平，这是一种性别决定取决于温度的物种。
作者：
T. Rhen;E. Willingham;J. Sakata;D. Crews
孵化温度决定了红耳滑龟（Trachemys scripta）性腺的性别。然而，很少有人知道孵化温度对性腺性别以外的其他性状的长期影响。为了研究孵化温度（独立于性腺性别）影响孵化后性类固醇水平的假设，我们在三个温度（26，28.6和31摄氏度）下孵化了红耳滑龟的蛋。然后，我们测量了26 ℃和28.6 ℃鸡蛋中6周龄雄性和28.6 ℃和31 ℃鸡蛋中6周龄雌性的血浆双氢睾酮、雌二醇、孕酮和睾酮水平。我们发现双氢睾酮水平不受孵化温度或性腺性别的影响。然而，孕酮水平显着高于男性从26摄氏度鸡蛋比男性从28.6摄氏度鸡蛋。相比之下，睾丸激素水平在26摄氏度的雄性与28.6摄氏度的雄性之间没有差异，但在28.6摄氏度的雌性中，睾丸激素水平显著高于31摄氏度的雌性。孕激素和睾酮水平在28.6摄氏度的鸡蛋中男性和女性之间没有差异。温度也会影响两性的雌二醇水平，但这种影响是神秘的。我们的结论是，孵化温度有持久的影响，即使在孵化后的性类固醇水平。
Incubation temperature determines gonadal sex in the red-eared slider turtle, Trachemys scripta. However, little is known about the long-term effects of incubation temperature on traits other than gonadal sex in this species. To investigate the hypothesis that incubation temperature (independent of gonadal sex) influences sex steroid levels after hatching, we incubated eggs of the red-eared slider turtle at three temperatures (26, 28.6, and 31 degrees C). We then measured plasma levels of dihydrotestosterone, estradiol, progesterone, and testosterone in 6-wk-old males from 26 degrees C and 28.6 degrees C eggs, and in 6-wk-old females from 28.6 degrees C and 31 degrees C eggs. We found that dihydrotestosterone levels were not influenced by incubation temperature or gonadal sex. However, progesterone levels were significantly higher in males from 26 degrees C eggs than in males from 28.6 degrees C eggs. In contrast, testosterone levels did not differ between males from 26 degrees C versus males from 28.6 degrees C eggs, but they were significantly higher in females from 28.6 degrees C than in females from 31 degrees C eggs. Progesterone and testosterone levels did not differ between males and females from 28.6 degrees C eggs. Temperature also influenced estradiol levels in both sexes, but the effects were enigmatic. We conclude that incubation temperature has lasting effects on sex steroid levels even after hatching.
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DOI：
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