Evidence that plumage bacteria influence feather coloration and body condition of eastern bluebirds Sialia sialis
Evidence that plumage bacteria influence feather coloration and body condition of eastern bluebirds Sialia sialis
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DOI：
10.1111/j.1600-048x.2008.04650.x
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发表时间：
2009-07-01
影响因子：
1.7
通讯作者：
Swaddle, John P.
中科院分区：
文献类型：
--
作者：
Gunderson, Alex R.;Forsyth, Mark H.;Swaddle, John P.
寄生虫影响第二性征的表达和感染者的健康。我们着手测试著名的外源寄生虫、羽毛细菌（包括羽毛降解细菌（FDB））对野生成年东部蓝知更鸟 Sialia sialis 的第二性征和身体状况的影响。先前的研究表明，FDB 在体外改变了结构彩色蓝鸟羽毛的颜色（Shawkey 等人，2007 年）。在一项关于细菌如何影响野生鸟类的相关研究中，我们发现随着 FDB 强度的增加，雌性羽毛变得更加暗淡。随着 FDB 强度的增加，雄性往往会变得更亮，但这种关系并不显着。我们还发现羽毛细菌强度和身体状况之间存在显着关联，但同样存在性别差异。雌性身体状况与羽毛细菌强度呈负相关，而雄性身体状况与羽毛细菌强度呈正相关。有趣的是，筑巢对中雄性和雌性的羽毛细菌强度呈显着正相关。我们还报告了在野生鸟类种群中测得的 FDB 患病率最高，在 67/68 (99%) 的个体中检测到了 FDB。需要进一步的工作来充分了解羽毛细菌和鸟类之间的关系，但我们的数据表明羽毛细菌可能对多种表型性状具有性别依赖性影响。
Parasites influence the expression of secondary sexual traits and the health of infected individuals. We set out to test the influence of reputed exogenous parasites, plumage bacteria, including feather-degrading bacteria (FDB), on secondary sexual characteristics and body condition of wild adult eastern bluebirds Sialia sialis. Previous work has shown that FDB alter the coloration of structurally-colored bluebird feathers in vitro (Shawkey et al. 2007). In a correlational study of how bacteria affect birds in the wild, we found that female plumage got duller with increasing FDB intensity. Males tended to get brighter with increasing FDB intensity, but the relationship was not significant. We also found significant associations between plumage bacteria intensity and body condition, but, again, with gender-based differences. Female body condition was negatively associated with plumage bacteria intensity, while male body condition was positively associated with plumage bacteria intensity. Interestingly, plumage bacteria intensity of males and females in nesting pairs was significantly positively correlated. We also report the highest prevalence of FDB measured in a wild bird population, with FDB detected on 67/68 (99%) of individuals. Further work is needed to fully understand the relationships between plumage bacteria and birds, but our data indicate that plumage bacteria may have sex-dependent effects on multiple phenotypic traits.