Constraints on temperature-dependent sex determination in the leopard gecko (Eublepharis macularius): response to Kratochvil et al.
Constraints on temperature-dependent sex determination in the leopard gecko (Eublepharis macularius): response to Kratochvil et al.
复制标题
豹纹守宫 (Eublepharis maulousius) 温度依赖性性别决定的限制：对 Kratochvil 等人的回应。
DOI：
10.1007/s00114-008-0433-5
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Crews,David
中科院分区：
文献类型：
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作者：
Huang,Victoria;Sakata,JonT;Rhen,Turk;Coomber,Patricia;Simmonds,Sarah;Crews,David
Kratochvil等人（Naturwissenschaften 95：209-215，2008）最近报道，在具有温度依赖性性别决定（TSD）的斑节壁虎科的斑节壁虎（Eublepharis macularius）中，卵在相同温度下孵育的窝只产生同性兄弟姐妹。根据性类固醇激素参与性别决定的研究来解释这一结果，他们认为母源性卵黄类固醇激素可以抑制TSD爬行动物的性别决定机制。我们对这个物种进行了广泛的研究，并定期在恒温下孵化离合器。为了测试不同孵化温度下高频率同性离合器的一致性，我们检查了1992年至2001年德克萨斯大学奥斯汀分校的离合器记录。我们观察到，在相同的孵化温度下孵化的卵的离合器产生混合性别离合器以及同性离合器。此外，在不同的温度下分离和孵化一窝卵的情况下，产生了预期数量的混合性别窝。这些结果表明，母亲的性别决定的影响是次要的孵化温度的影响。
Kratochvil et al. (Naturwissenschaften 95:209–215, 2008) reported recently that in the leopard gecko (Eublepharis macularius) of the family Eublepharidae with temperature-dependent sex determination (TSD), clutches in which eggs were incubated at the same temperature produce only same-sex siblings. Interpreting this result in light of studies of sex steroid hormone involvement in sex determination, they suggested that maternally derived yolk steroid hormones could constrain sex-determining mechanisms in TSD reptiles. We have worked extensively with this species and have routinely incubated clutches at constant temperatures. To test the consistency of high frequency same-sex clutches across different incubation temperatures, we examined our records of clutches at the University of Texas at Austin from 1992 to 2001. We observed that clutches in which eggs were incubated at the same incubation temperature produced mixed-sex clutches as well as same-sex clutches. Furthermore, cases in which eggs within a clutch were separated and incubated at different temperatures produced the expected number of mixed-sex clutches. These results suggest that maternal influences on sex determination are secondary relative to incubation temperature effects.