A structural colour ornament correlates positively with parasite load and body condition in an insular lizard species
A structural colour ornament correlates positively with parasite load and body condition in an insular lizard species
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DOI：
10.1007/s00114-016-1378-8
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发表时间：
2016-08-01
影响因子：
1.8
通讯作者：
Merino, Santiago
中科院分区：
文献类型：
--
作者：
Megia-Palma, Rodrigo;Martinez, Javier;Merino, Santiago
脊椎动物的色素装饰可能反映了个体的身体状况或健康状况，与环境压力和激素平衡有关。在塑造性色彩的环境因素中，寄生虫感染一直被强调为一个重要的进化压力，限制了基于色素的装饰品的维护。然而，脊椎动物中基于结构的装饰物的诚实性仍然存在争议。在Gallotia蜥蜴的结构紫外线偏置的装饰品被描述为一个特征，在配偶和竞争对手的评估表明这些信号的可靠性。我们在血液寄生虫患病率几乎为100%的人群中调查了寄生虫血症、身体状况和性二色加那利蜥蜴Gallotia galloti脸颊上存在的基于结构的装饰物之间的关系。使用分光光度技术，我们发现，男性与脸颊紫外线色度值较高的感染更多的血液寄生虫。血液寄生虫负荷和身体状况之间没有显着的关系。然而，脸颊紫外线色度较高的男性表现出明显更好的身体状况。此外，我们还发现，无论男女，脸颊色调与个体的身体状况都有显著相关。在男性中，脸颊反射率偏向紫外线范围显着相关的更好的身体状况。在女性中，那些身体状况较好的人表现出更多的白色脸颊，较少的紫外线，这表明脸颊色调作为性别识别的中间性信号。我们的结论是，脸颊色度和寄生虫负载之间的正相关关系在男性蜥蜴是兼容的差异密度的黑色素和虹膜细胞的安排在真皮传达个人的能力，以科普环境压力。
Pigment-based ornaments in vertebrates may reflect the body condition or health status of the individual in correlation with environmental stress and hormonal balance. Among the environmental factors shaping sexual colouration, parasitic infections have been stressed as an important evolutionary pressure constraining the maintenance of pigment-based ornaments. However, the honesty of structure-based ornaments in vertebrates is still under debate. Structural UV-biased ornaments in Gallotia lizards were described as a trait used by conspecifics during mate and rival assessment suggesting the reliability of these signals. We investigated the relationship between parasitaemia, body condition and a structural-based ornament present in the cheek of the sexually dichromatic Canarian lacertid Gallotia galloti in a population with an almost 100 % prevalence of haemoparasites. Using spectrophotometric techniques, we found that males with higher values of cheek UV chroma were infected with more haemoparasites. No significant relationship was found between haemoparasite load and body condition. However, males with higher cheek UV chroma showed significantly better body condition. In addition, we found that cheek hue was significantly related to body condition of individuals in both sexes. In males, cheek reflectivity biased towards the UV range was significantly related to better body condition. In females, those individuals with better body condition showed more whitish cheeks with less UV suggesting that cheek hue serves as an intersexual signal for sex recognition. We conclude that the positive relationship between cheek chroma and parasite load in male lizards is compatible with both differential density of melanin and iridophore arrangement in the dermis conveying an individual's ability to cope with environmental stress.