Maternally derived sex steroid hormones impact sex ratios of loggerhead sea turtles

Maternally derived sex steroid hormones impact sex ratios of loggerhead sea turtles
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母体性类固醇激素影响红海龟的性别比例

DOI:
10.1101/2020.01.10.901520
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Lockley E
Lockley E
中科院分区:
--
文献类型:
--
作者:
Lockley E

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最佳性别比例可以说是物种最重要的人口统计特征之一。全球气温上升威胁着温度依赖性性别决定(TSD)物种的极端性别比例偏差,并最终灭绝。由于性类固醇激素可以影响TSD爬行动物的性别决定,蛋黄内的母体转移的变化可能会形成一种缓冲机制,以防止温度升高。我们测试了这一假设,通过量化的影响,母体雌二醇(E2)和睾酮(T)对后代性别的威胁TSD人口的红海龟(Caretta caretta)。测定了产卵雌虫、产卵时卵黄和新生儿的E2和T循环水平。产卵后立即将巢重新安置到原位实验孵化场,通过标准化孵化深度控制温度。我们使用亲和传播聚类的激素配置文件引导的孵化时间,性别的个人从这些巢在一个非致命的方式,提供了一种新的保护工具,这种濒危物种。尽管标准化的温度,我们发现了一个很大的水平的变化,在性别比的离合器,相关的非线性方式与母亲投资的E2:T的比例在蛋黄。雄性在相同水平的E2和T下产生,雌性在此最佳值的两侧产生。为未来世纪的性别比例建模,我们表明,母源性激素形成一个跨代的机制TSD可塑性,调整后代的性别比例濒危海龟。
An optimal sex ratio is arguably one of the most important demographic traits of species. Rising global temperatures threaten temperature-dependent sex determination (TSD) species with extreme sex ratio bias and ultimately extinction. Because sex steroid hormones can impact sex determination in TSD reptiles, variation in their maternal transfer within the egg yolk may form a buffer mechanism against raising temperatures. We tested this hypothesis by quantifying the effect of maternal oestradiol (E2) and testosterone (T) on offspring sex in a threatened TSD population of loggerhead sea turtles (Caretta caretta). Circulating levels of E2and T in nesting females, in egg yolks at oviposition and in neonates were measured. Immediately after oviposition, nests were relocated into anin situexperimental hatchery where temperatures were controlled by standardising the incubation depth. We used affinity propagation clustering on hormone profiles guided by incubation duration, to sex individuals from these nests in a non-lethal manner, offering a novel conservation tool for this endangered species. Despite standardised temperatures, we found a large level of variation in the sex ratio of clutches, which correlated in a non-linear manner with maternal investment of the E2:T ratio in egg yolks. Males were produced at equal levels of E2and T and females were produced on either side of this optimum. Modelling sex ratios for the coming century, we show that maternally-derived hormones form a trans-generational mechanism of TSD plasticity that adjusts offspring sex ratios in endangered sea turtles.
DOI: 10.1002/jez.2183
发表时间: 2018-04
期刊: Journal of experimental zoology. Part A, Ecological and integrative physiology
影响因子: --
作者:
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DOI: 10.1016/j.cub.2017.11.057
发表时间: 2018-01-08
期刊: CURRENT BIOLOGY
影响因子: 9.2
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通讯作者: Dutton, Peter H.
假定的芳香酶抑制剂会诱导雌性单性蜥蜴和乌龟的雄性性别决定,并具有温度依赖性性别决定。
DOI: 10.1677/joe.0.1410295
发表时间: 1994
期刊: The Journal of endocrinology
影响因子: --
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类固醇激素诱导的海龟性别决定的特异性。
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发表时间: 1992
期刊: The Journal of endocrinology
影响因子: --
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Wibbels,T;Crews,D
通讯作者: Crews,D
DOI: 10.3354/esr00684
发表时间: 2015-01-01
影响因子: 3.1
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Lolavar, Alexandra;Wyneken, Jeanette
通讯作者: Wyneken, Jeanette