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引用次数: 0
摘要
产前睾酮(T)从母体向后代的转移是表型可塑性的一个重要来源。在鸟类中,暴露于与生态相关的刺激(如社会竞争或有吸引力的配偶)会使雌鸟在卵黄中沉积更多的睾酮。暴露于升高的卵黄 T 会改变后代的几种体能相关性状的表达(如生长、免疫功能、第二性征和行为)。尽管其中一些变化具有潜在的适应性,但并非所有研究都发现卵黄 T 水平会随着生态相关刺激因素的变化而变化。这种异质性目前还无法解释,限制了我们预测代际间对生态变化反应的能力。在此,我们进行了系统的文献检索,在39个野生物种中发现了119个观察结果,这些观察结果测量了卵黄T分配在各种刺激下的雌性间差异。我们利用机器学习的一种形式--助推回归树来检验物种特异性或研究水平变量的变化是否能解释卵黄T分配的变化(即有统计学意义的反应与无意义的反应)。我们发现,物种特异性和研究水平变量都是预测卵黄T水平显著变化的重要因素。地理范围(纬度和经度)、进化独特性、寿命、相对于雌性质量的卵量、社会性、迁徙状态和羽化时间是 48 个被研究物种中影响最大的前 10 个预测因子。我们还发现,与其他生态环境研究相比,测量或操纵社会刺激(如竞争和繁殖密度)或繁殖日期的研究更有可能发现卵黄T分配的变化。总之,这些数据提供了有关卵黄T分配及其在不同物种和环境中的适应价值的几个可检验的假设。此外,这些发现还有助于我们预测生态变化将如何影响雌性的激素反应,从而影响后代。
期刊介绍:
Journal of Animal Ecology publishes the best original research on all aspects of animal ecology, ranging from the molecular to the ecosystem level. These may be field, laboratory and theoretical studies utilising terrestrial, freshwater or marine systems.