Short heatwaves during fluctuating incubation regimes produce females under temperature-dependent sex determination with implications for sex ratios in nature.
Short heatwaves during fluctuating incubation regimes produce females under temperature-dependent sex determination with implications for sex ratios in nature.
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DOI：
10.1038/s41598-017-17708-0
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发表时间：
2018-01-08
影响因子：
4.6
通讯作者：
Bowden RM
中科院分区：
文献类型：
--
作者：
Carter AW;Sadd BM;Tuberville TD;Paitz RT;Bowden RM
自然界中的温度波动模式影响许多生物过程，然而，经验研究通常使用恒温处理。这可能会限制我们对热敏感物种如何对生态相关温度做出反应的理解。对具有温度依赖性性别决定（TSD）的海龟的研究提供了很好的例子，因为在恒定的实验室条件下，许多种群的巢穴温度很少超过产生雌性所需的温度。我们假设暴露于短暂的温暖温度（即，热浪）是TSD物种性别决定的组成部分，这需要超越恒温的测试。我们暴露Trachemys scripta胚胎从多个种群和整个筑巢季节的热浪的可变持续时间和量化的性别比例。我们发现，所有种群的胚胎对短暂暴露于雌性生产温度高度敏感;只有7.9天的暴露产生了50：50的性别比例，但在整个筑巢季节的反应各不相同。根据这些发现，开发了一个模型来估计性别比从现场温度痕迹，这个模型优于传统的方法。总的来说，这些结果增强了我们对TSD的理解，并强调了在研究热敏过程时使用生物相关温度的重要性。
Patterns of temperature fluctuations in nature affect numerous biological processes, yet, empirical studies often utilize constant temperature treatments. This can limit our understanding of how thermally sensitive species respond to ecologically relevant temperatures. Research on turtles with temperature-dependent sex determination (TSD) provides good examples of this, since nest temperatures from many populations rarely exceed those necessary to produce females under constant laboratory conditions. We hypothesized that exposure to brief periods of warm temperatures (i.e., heat waves) are integral to sex determination in species with TSD, which requires tests that move beyond constant temperatures. We exposed Trachemys scripta embryos from multiple populations and across the nesting season to heat waves of variable durations and quantified sex ratios. We found that embryos from all populations were highly sensitive to brief exposures to female producing temperatures; only 7.9 days of exposure produced a 50:50 sex ratio, but the response varied across the nesting season. From these findings, a model was developed to estimate sex ratios from field temperature traces, and this model outperformed traditional methods. Overall, these results enhance our understanding of TSD and emphasize the importance of using biologically relevant temperatures when studying thermally sensitive processes.
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影响因子：
4.4
作者：
Alexander, LV;Zhang, X;Vazquez-Aguirre, JL
通讯作者：
Vazquez-Aguirre, JL
DOI：
10.1073/pnas.1930548100
发表时间：
2003-10-14
影响因子：
11.1
作者：
Cotton, PA
通讯作者：
Cotton, PA
影响因子：
3.3
作者：
BULL, JJ;VOGT, RC;MCCOY, CJ
通讯作者：
MCCOY, CJ
影响因子：
2.6
作者：
Bowden, Rachel M.;Carter, Amanda W.;Paitz, Ryan T.
通讯作者：
Paitz, Ryan T.
影响因子：
2.7
作者：
GEORGES, A
通讯作者：
GEORGES, A