Understanding the ecological determinants of interspecific achromatic (light-to-dark) plumage variation in birds is crucial yet challenging due to the complex interplay of climatic, habitat-related, and morphological influences. This study aimed to disentangle the effects of temperature, precipitation, habitat openness, body mass and hand-wing index (HWI, a widely used single-parameter proxy for the extent to which a species relies on flight) on shaping achromatic plumage variation among bird species.

中文翻译：

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解开鸟类种间无色羽毛变异的生态驱动因素


由于气候、栖息地相关和形态影响的复杂相互作用，了解鸟类种间无色（浅色到深色）羽毛变异的生态决定因素至关重要，但也具有挑战性。本研究旨在阐明温度、降水、栖息地开放度、体重和手翼指数（HWI，一种广泛使用的单参数代表物种依赖飞行程度的指标）对鸟类无色羽毛变异的影响物种。