Disentangling thermal from alternative drivers of reflectance in jewel beetles: a macroecological study

To predict future colour-climate relationships, it is important to distinguish thermal drivers of reflectance from other evolutionary drivers. This can be achieved by comparing relationships between climate and colouration in ultraviolet-visible (UV-Vis) and near-infrared (NIR) light, separately; yet NIR properties have been measured in very few species. Here, we used jewel beetles (Coleoptera: Buprestidae) as models to identify climatic drivers of reflectance because jewel beetles have highly diverse colouration, a wide distribution, and are often active in hot conditions. Specifically, we tested the association between climate, body size and reflectance using a phylogenetic comparative analysis for three wavebands (UV-Vis, NIR, total). Results showed that reflectance of jewel beetles was more strongly predicted by body size than climate. NIR and total reflectance was not associated with climate, but larger beetles had higher NIR reflectance. For UV-Vis reflectance, small beetles were ..., ,

为预测未来的体色-气候关联关系，区分体色反射率的热驱动因子与其他演化驱动因子至关重要。该研究目标可通过分别比较气候与紫外-可见光（ultraviolet-visible, UV-Vis）、近红外（near-infrared, NIR）波段下体色的关联关系实现，但目前仅有极少物种被测定了近红外相关属性。本研究以吉丁甲（鞘翅目: 吉丁甲科，Coleoptera: Buprestidae）为模式类群，探究体色反射率的气候驱动因子，原因在于吉丁甲具有极为多样的体色、广泛的分布范围，且常活跃于高温环境中。具体而言，我们针对三个波段（UV-Vis、NIR及总反射率）开展系统发育比较分析，以检验气候、体型与反射率三者间的关联。研究结果显示，相较于气候因子，体型对吉丁甲反射率的预测能力更强。近红外与总反射率均与气候无显著关联，但体型更大的吉丁甲具有更高的近红外反射率。针对紫外-可见光反射率，体型较小的吉丁甲……