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评估中心边缘假设:在Quercus bicolor的尾行边缘内进和遗传变异

Jesse B Parker¹, Sean Hoban^2,3, Laura M Thompson^1,4

¹School of Natural Resources, University of Tennessee, Knoxville, Tennessee, USA.

Molecular ecology

|November 25, 2025

概括

其他树种类的入侵缓冲了Quercus bicolor的范围边缘种群的遗传侵蚀,挑战了中心边缘假设. 在未来,杂交可能会增加.

科学领域:

进化生物学进化生物学
人口遗传学人口遗传学
保护遗传学保护遗传学

背景情况:

中央边缘假设 (CMH) 预测在范围边缘的基因多样性较低.
由于杂交,可以发生偏差,这是Quercus属中常见的过程.
了解范围边缘种群的遗传模式对于保护至关重要.

研究的目的:

调查Quercus bicolor在其分布范围内的遗传多样性,结构和内进.
为了测试CMH在广泛分布的北美东部树物种中的预测.
评估杂交在在范围边缘塑造遗传景观中的作用.

主要方法:

来自12个范围边缘和9个范围核心地点的142个Quercus bicolor个体的RADseq基因定型.
整合了来自六种对应的白树物种的参考数据,以检测内侵.
生态利基模型 (后预测,当前预测,预测) 预测杂交潜力.

主要成果:

在南部范围边缘种群中检测到Quercus lyrata的广泛内进,但在核心种群中没有检测到.
范围边缘种群表现出增加的遗传结构和差异化,但没有减少多样性或增加近亲繁殖.
内向的祖先与异构性和分化有积极的相关性,这表明对遗传侵蚀有缓冲效应.

结论:

结果为CMH提供了混合的支持,突出了在范围边缘内进的重要作用.
杂交可能引入新的等位基因,可能有利于范围边缘种群.
未来的气候变化和利基重叠表明杂交潜力增加,这对Quercus bicolor的保护有影响.

关键词:

适应性内向攻击 (adaptive introgression) 是一种适应性的内向攻击.中心周边周边保护保护保护混合化混合化混合化树的树木树的树木背面的边缘是后边的

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