Thermosensitive period for sex determination of the tropical freshwater turtle Malayemys macrocephala,Integrative Zoology

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Thermosensitive period for sex determination of the tropical freshwater turtle Malayemys macrocephala
Integrative Zoology ( IF 3.5 ) Pub Date : 2020-08-06 , DOI: 10.1111/1749-4877.12479
Rangsima Pewphong ₁ , Jirarach Kitana _{1,

2} , Noppadon Kitana _{1,

2}

Affiliation

Many egg‐laying reptiles possess temperature‐dependent sex determination (TSD) in which outcome of gonadogenesis is determined by incubation temperature during a temperature‐sensitive period of development. Prior studies on Malayemys macrocephala showed that incubation temperatures influence gonadal development and suggested that M. macrocephala exhibits TSD. However, information on the temperature‐sensitivity period in this species was unknown until the current study. Turtle eggs were collected from rice fields in central Thailand from December 2016 to February 2017. In the laboratory, eggs were incubated at male‐biased temperature (26 °C) and shifted to female‐biased temperature (32 °C), or vice versa. Single shift experiments were performed systematically during embryonic stages 13–21. After hatching, sex of individual turtles was determined by histological analysis. We found that the sex determination of M. macrocephala is affected by temperature up to stage 16 of embryonic development.

中文翻译：

热带淡水龟Malayemys macrocephala性别确定的热敏期

许多产卵爬行动物具有温度依赖性性别决定（TSD），其中性腺生成的结果由温度敏感发育时期的温育温度决定。先前对大头Ma的研究表明，孵化温度会影响性腺的发育，并暗示大头M展示TSD。但是，直到本研究之前，有关该物种的温度敏感期的信息尚不清楚。从2016年12月至2017年2月，从泰国中部的稻田中收集了海龟卵。在实验室中，将卵在雄性偏置温度（26°C）下孵育，并转移到雌性偏置温度（32°C），反之亦然。单班实验是在胚胎13-21阶段系统地进行的。孵化后，通过组织学分析确定个别海龟的性别。我们发现，大头念珠菌的性别决定受温度影响，直至胚胎发育的第16阶段。

更新日期：2020-08-06

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