Dietary carotenoid pigments and immune function in a songbird with extensive carotenoid-based plumage coloration
Dietary carotenoid pigments and immune function in a songbird with extensive carotenoid-based plumage coloration
复制标题
具有广泛类胡萝卜素羽毛着色的鸣禽的膳食类胡萝卜素色素和免疫功能
DOI：
10.1093/beheco/arg085
复制
发表时间：
2003
影响因子：
2.4
通讯作者：
G. Hill
中科院分区：
文献类型：
--
作者：
K. Navara;G. Hill
类胡萝卜素色素可以直接增强脊椎动物的免疫反应，它们被许多动物用来创造装饰性的颜色显示。据推测，类胡萝卜素色素的这两种功能是相关的：动物必须权衡使用类胡萝卜素色素的免疫功能与装饰展示。我们测试了这一假设的两个关键预测与圈养的美国金翅雀，Carduelis tristis，一个物种，广泛的类胡萝卜素为基础的羽毛着色。首先，我们测试了雄性金翅雀的免疫系统是否是类胡萝卜素限制在蜕皮过程中提供治疗组低，接近正常，或高的饮食获得叶黄素和玉米黄质。日粮处理对羽毛和喙颜色有显着影响，但对免疫能力无显着影响。我们比较了细胞介导的和体液免疫反应和疾病的过程中感染后的男性在不同的治疗。我们没有观察到饮食中类胡萝卜素含量对免疫反应或抗病性的显着影响。第二，我们测试是否有一个积极的关系，免疫功能和表达的装饰着色通过比较前和后处理羽毛着色的男性，他们的免疫反应。我们没有发现装饰展示和免疫功能之间的预期权衡。这些发现并不支持这一假设，即鸣禽与广泛的类胡萝卜素为基础的羽毛显示权衡使用类胡萝卜素与免疫功能。版权所有2003年。
Carotenoid pigments can directly enhance the immune responses of vertebrates, and they are used by many animals to create ornamental color displays. It has been hypothesized that these two functions of carotenoid pigments are linked: animals must trade off use of carotenoid pigments for immune function versus ornamental display. We tested two key predictions of this hypothesis with captive American goldfinches, Carduelis tristis, a species with extensive carotenoid-based plumage coloration. First, we tested whether the immune systems of male goldfinches are carotenoid limited during molt by supplying treatment groups with low, approximately normal, or high dietary access to lutein and zeaxanthin. Dietary treatment had a significant effect on plumage and bill color but not on immunocompetence. We compared the cell-mediated and humoral immune responses and the course of disease after infection for males in the different treatments. We observed no significant effect of the carotenoid content of diet on immune response or disease resistance. Second, we tested whether there was a positive relationship between immune function and expression of ornamental coloration by comparing both the pre- and posttreatment plumage coloration of males to their immune responses. We failed to find the predicted trade-off between ornament display and immune function. These findings do not support the hypothesis that songbirds with extensive carotenoid-based plumage displays trade off the use of carotenoids for ornamentation versus immune function. Copyright 2003.