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Molecular mechanism of temperature-dependent sex determination and differentiation in chinese alligator revealed by developmental transcriptome profiling

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Science Bulletin 2018年第4期63卷 209-212页

作者： Jian-Qing Lin Qi Zhou Hai-Qiong Yang Li-Ming Fang Ke-Yi Tang Li Sun Qiu-Hong Wan Sheng-Guo Fang The Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education and State Conservation Center for Gene Resources of Endangered WildlifeCollege of Life SciencesZhejiang UniversityHa ngzhou 310058China Life Sciences Institute Zhejiang UniversityHangzhou 310058China changxing yinjiahian chinese alligator nature reserve Changxing 313100China

Sex determination(SD)is a critical embryonic development process that has profound impacts on the morphology of individuals and the survival of populations[1].In vertebrates,sex can be determined by either genetic or environmental factors[2],with the underlying molecular mechanism unknown for most species except for a few model organisms[3,4].Unlike mammals and birds,

关键词：温度依赖短吻鳄性别中国机制分子性染色体脊椎动物

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The sex ratio of wild chinese alligators alligator sinensis

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Current Zoology 2013年第6期59卷 725-731页

作者： Lan ZHAO Hai-Qiong YANG Li-Ming FANG Guo-Liang PAN Wei-Qiang ZOU Da-Bin REN Qiu-Hong WAN Sheng-Guo FANG The Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education State Conservation Center for Gene Resources of Endangered Wildlife College of Life Sciences Zhejiang University Hangzhou 310058 China changxing Yinjiabian chinese alligator nature reserve Changxing 313100 Zhejiang China

The chinese alligator alligator sinensis is one of the most endangered crocodilian species, and typically exhibits temperature-dependent sex determination. It is extremely important to clarify the sex structure of chinese alligators to implement recovery projects successfully. However, the sex ratio of wild chinese alligators remains unknown. In this study, we collected 28 years of sex ratio data from chinese alligators residing in the natural and artificial habitats of changxing nature reserve, China, and examined the differences in the sex ratio dynamics between these two populations. We observed that the sex ratio of wild chinese alligators is 1 male to 4.507 females, which was significantly lower compared to that of the captive population （1 to 2.040; P 〈 0.001）, and is significantly different to previously documented sex ratios for this species （all P 〈 0.01）. Furthermore, we documented an annually stable （P = 1.000） female-biased sex ratio for wild alligators at hatching [1 male to 4.747 females; 0.174 （0.167~）.182）], in contrast to a dramatically fluctuating sex ratio （P 〈 0.001） in captivity [1 male to 1.674 females; 0.374 （0.246-0.593）], showing a potential mechanism for adjusting the sex structure. Finally, we found that the hatchling sex ratios were similar to that of the population sex ratio （P = 0.748）, with little correlation to air temperature values in the 60-70 day incubation period during the breeding season （July and August; both P 〉 0.05）. Overall, this study indicates that the stabilized female-biased sex ratio of changxing chinese alligators might result from selection pressure caused by local mate competition and major inbreeding .

关键词： Reptile Female-biased Temperature-dependent sex determination Conservation

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