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首页> 外文期刊>Ecological research >UV plumage color is an honest signal of quality in male budgerigars
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UV plumage color is an honest signal of quality in male budgerigars

机译：UV羽色是雄性虎皮鹦鹉质量的诚实信号

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摘要

Elaborate and colorful feathers are important traits in female mate choice in birds. Plumage coloration can result from pigments deposited in feathers such as carotenoids and melanins, or can be caused by nano-scale reflective tissues (structurally based coloration), usually producing ultraviolet (UV) coloration. Structural colorations remain the least studied of the three most important feather colorations. Previous studies have found a female preference for UV color in the budgerigar, Melopsittacus undulatus, but it is not clear what information this ornament conveys, nor what is the possible cost associated with its production. We investigated possible correlations between immune response and plumage color of wild-type (green) male budgerigars. In particular we measured the wing web swelling resulting from injection of phytohaemagglutinin (PHA). We did not detect any correlation between the sedimentation rate and morphological and color variables. We found that UV chroma is the best predictor for the cutaneous immune activity. Indeed, male budgerigars with high UV reflectance in the breast feathers showed stronger immune responses. These results are consistent with the idea that UV colors are special signals conveying information about a bird's condition.
机译：精巧而色彩艳丽的羽毛是鸟类雌鸽选择的重要特征。全身羽毛的着色可能是由沉积在羽毛中的色素（如类胡萝卜素和黑色素）引起的，也可能是由纳米级反射性组织（基于结构的着色）引起的，通常会产生紫外线（UV）着色。在三种最重要的羽毛着色中，结构着色仍然是研究最少的。先前的研究发现，虎皮鹦鹉Melopsittacus undulatus对紫外线颜色有女性偏爱，但目前尚不清楚这种装饰物传达的信息是什么，生产该产品可能带来的成本也不清楚。我们调查了免疫应答和野生型（绿色）虎皮鹦鹉的羽毛颜色之间的可能相关性。特别是，我们测量了注射植物血凝素（PHA）导致的机翼腹板膨胀。我们没有发现沉降速率与形态和颜色变量之间的任何相关性。我们发现紫外线色度是皮肤免疫活性的最佳预测指标。确实，在胸羽中具有高紫外线反射率的雄性虎皮鹦鹉显示出更强的免疫反应。这些结果与紫外线颜色是传达有关禽类状况信息的特殊信号的想法是一致的。

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