发育温度波动对爬行动物表型性状的影响:一项荟萃分析。

Rebecca S Raynal, D. Noble, J. Riley, A. Senior, D. Warner, G. While, L. Schwanz
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引用次数: 3

摘要

在生命早期的脆弱阶段,大多数变温动物都会随着气温的变化而经历每小时甚至每天的温度波动。虽然我们对不同的恒定温度如何影响变温动物的表型了解很多,但我们对温度波动对变温动物发育的影响知之甚少。在这项研究中,我们使用了一种荟萃分析方法来比较爬行动物物种在恒定和波动孵化温度下表型结果的平均值和方差。我们发现,与恒温相比,在较低的平均温度下,波动温度提供了一个小的好处(更高的孵化成功率和更短的孵化时间),但在温暖的平均温度下有负面影响。此外,与温和的温度波动相比,更极端的温度波动导致胚胎存活率的更大下降。从具有温度依赖性性别决定的物种获得的有限数据中,与在恒定温度下发育的胚胎相比,在波动温度下发育的胚胎发育为雌性的机会更高。通过我们的荟萃分析方法,我们确定了所有类群的平均巢穴温度,当孵化温度波动时,爬行动物从获得收益转变为产生成本。更广泛地说,我们的研究表明,通过整合发育温度曲线和热性能曲线,可以预测发育温度波动对变温分类群某些表型的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of fluctuating developmental temperatures on phenotypic traits in reptiles: a meta-analysis.
During the vulnerable stages of early life, most ectothermic animals experience hourly and diel fluctuations in temperature as air temperatures change. While we know a great deal about how different constant temperatures impact the phenotypes of developing ectotherms, we know remarkably little about the impacts of temperature fluctuations on the development of ectotherms. In this study, we used a meta-analytic approach to compare the mean and variance of phenotypic outcomes from constant and fluctuating incubation temperatures across reptile species. We found that fluctuating temperatures provided a small benefit (higher hatching success and shorter incubation durations) at cool mean temperatures compared with constant temperatures, but had a negative effect at warm mean temperatures. In addition, more extreme temperature fluctuations led to greater reductions in embryonic survival compared with moderate temperature fluctuations. Within the limited data available from species with temperature-dependent sex determination, embryos had a higher chance of developing as female when developing in fluctuating temperatures compared with those developing in constant temperatures. With our meta-analytic approach, we identified average mean nest temperatures across all taxa where reptiles switch from receiving benefits to incurring costs when incubation temperatures fluctuate. More broadly, our study indicates that the impact of fluctuating developmental temperature on some phenotypes in ectothermic taxa are likely to be predictable via integration of developmental temperature profiles with thermal performance curves.
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