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穿着适合天气:在气候梯度上,乌羽毛的适应性

Charlotte Perrault^1,2, Miguel Baltazar-Soares¹, Chiara Morosinotto^3,4

¹Department of Biology University of Turku Turku Finland.

Ecology and evolution

|June 25, 2025

概括

鸟类羽毛的特性,如绝缘性,可能表明当地适应气候. 陶尼猫头 (Strix aluco) 的羽毛结构因遗传漂移而变化超过预期,这表明自然选择. 羽毛的颜色显示适应程度较低.

科学领域:

进化生物学是进化的生物学.
鸟类生态学鸟类生态学
适应气候变化适应气候变化

背景情况:

种群通常通过自然选择适应当地环境,由基因流动抵消.
鸟类的羽毛特性,如绝缘和颜色,是局部适应的潜在指标.
黄猫头 (Strix aluco) 是研究其在欧洲范围内的适应的一个合适的模型.

研究的目的:

为了研究青猫头的羽毛特性和羽毛颜色是否反映了当地适应环境条件.
将羽毛特征的表型分歧 (PST) 与遗传分歧 (FST) 进行比较,以推断自然选择与遗传漂移的作用.
为了确定气候是否影响特定的羽毛特性,例如绝缘能力.

主要方法:

在九个欧洲种群中研究了黑色猫头的羽毛特性 (羽毛状部分,刺和刺密度) 和羽毛颜色 (暗色与浅色的变形).
利用了八个微卫星标记物来推断种群之间的遗传分歧 (FST).
计算了羽毛特征的表型差异 (PST),并将其与FST进行比较,以评估自然选择的影响.

主要成果:

在不同种群中观察到较低的整体遗传差异化 (FST = 0.022).
大多数羽毛结构的表型差异 (PST) 超过了FST,表明了潜在的局部适应.
背部羽毛绝缘 (羽毛状部分) 在较冷的人群中较大,这表明气候驱动的适应,而羽毛颜色显示出有限的适应变化.

结论:

羽毛的结构性质,特别是在背部羽毛中,似乎是由当地适应气候所塑造的,可能会在更冷的地区增强绝缘.
棕猫头的羽毛颜色变化在大型空间尺度上的适应中起着有限的作用.
鸟类羽毛的特征提供了对当地适应过程的见解,这些过程是由气候等环境因素所驱动的.

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