Correlates of individual variation in the porphyrin-based fluorescence of red-necked nightjars (Caprimulgus ruficollis)
Correlates of individual variation in the porphyrin-based fluorescence of red-necked nightjars (Caprimulgus ruficollis)
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DOI：
10.1038/s41598-019-55522-y
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发表时间：
2019-12-13
影响因子：
4.6
通讯作者：
Saez-Gomez, Pedro
中科院分区：
文献类型：
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作者：
Camacho, Carlos;Jose Negro, Juan;Saez-Gomez, Pedro
许多夜行动物，包括蝎子等无脊椎动物和各种脊椎动物物种，包括蟾蜍，飞鼠，猫头鹰和夜鹰，在紫外线下发出明亮的荧光。然而，这种独特的色彩如此重视非物质性的生态意义仍然模糊。在这里，我们使用了一个深入研究的人口迁移红颈夜鹰（Caprimulgus ruficollis）调查个体间的变化，卟啉为基础的粉红色荧光根据性别，年龄，身体状况，一年中的时间，和程度的白色羽毛补丁已知参与性交流。雄鸟和雌鸟在幼鸟和成鸟的翅膀下侧都表现出类似程度的粉红色荧光，但雄鸟的白色斑块比雌鸟大。身体状况预测的粉红色荧光的程度在少年鸟，但不是在成年人。平均而言，青少年的粉红色荧光的程度增加了约。体重每增加10克就增加20%对于两个年龄组，荧光量略有季节性增加（每周1-4%）。我们的研究结果表明，夜鹰的卟啉为基础的颜色可能信号的个人质量，至少在他们的第一个潜在的繁殖季节，虽然这些和其他夜间鸟类感知荧光的能力仍然是明确的证明。
Many nocturnal animals, including invertebrates such as scorpions and a variety of vertebrate species, including toadlets, flying squirrels, owls, and nightjars, emit bright fluorescence under ultraviolet light. However, the ecological significance of this unique coloration so attached to nocturnality remains obscure. Here, we used an intensively studied population of migratory red-necked nightjars (Caprimulgus ruficollis) to investigate inter-individual variation in porphyrin-based pink fluorescence according to sex, age, body condition, time of the year, and the extent of white plumage patches known to be involved in sexual communication. Males and females exhibited a similar extent of pink fluorescence on the under-side of the wings in both juvenile and adult birds, but males had larger white patches than females. Body condition predicted the extent of pink fluorescence in juvenile birds, but not in adults. On average, the extent of pink fluorescence in juveniles increased by ca. 20% for every 10-g increase in body mass. For both age classes, there was a slight seasonal increase (1-4% per week) in the amount of fluorescence. Our results suggest that the porphyrin-based coloration of nightjars might signal individual quality, at least in their first potential breeding season, although the ability of these and other nocturnal birds to perceive fluorescence remains to be unequivocally proven.