Multimodal signalling: structural ultraviolet reflectance predicts male mating success better than pheromones in the butterfly Colias eurytheme L. (Pieridae)
Multimodal signalling: structural ultraviolet reflectance predicts male mating success better than pheromones in the butterfly Colias eurytheme L. (Pieridae)
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多模态信号：结构紫外线反射率比蝴蝶 Colias eurytheme L.（粉蝶科）的信息素更能预测雄性交配成功
DOI：
10.1016/j.anbehav.2006.07.004
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发表时间：
2007
期刊：
影响因子：
2.5
通讯作者：
R. Rutowski
中科院分区：
文献类型：
--
作者：
R. Papke;D. Kemp;R. Rutowski
在性选择中，当不止一种感觉模式被激活时，多模式信号会引发配偶选择。然而，确定每个信号的相对用途很困难，因为它需要全面了解交配系统以及该系统在自然条件下如何工作。我们研究了结构紫外线 (UV) 反射率和信息素在蝴蝶 Colias eurytheme 中的作用。这两个特征对于介导种间相互作用都很重要，并且信息素与种内配偶选择有关。由于多层薄膜干涉阵列的存在而产生的紫外线反射率有潜力作为男性状况、活力和/或年龄的诚实指标。我们通过将未交配的雌性释放到自由飞行的雄性的路径上，直到每只雌性拒绝并接受至少一只雄性，来研究这些信号特征与求爱成功的相关性。这种设计促进了对配偶选择的受试者（女性）内部分析，从而控制了女性内在接受性中潜在的令人困惑的变化。主成分分析表明，雄性之间的紫外线亮度和信息素的变化基本上是正交的。雌性更喜欢年轻的雄性（通过翅膀磨损来主观判断），虽然年龄与紫外线亮度和几乎所有信息素描述符共同变化，但紫外线亮度成为雄性交配成功的最佳和最普遍的预测指标。我们的结果表明，这一性状是广色蝴蝶中重要的种内性信号，并且它们提供了迄今为止关于结构着色与蝴蝶雌性配偶选择的功能相关性的最清晰的证据。我们讨论在进化策略方面优先使用一种第二性征（紫外线反射率）而不是另一种（信息素）。
In sexual selection, multimodal signals elicit mate choice when more than one sensory modality is activated. However, determining the relative use of each signal is difficult because it requires a comprehensive understanding of the mating system and how this system works under natural conditions. We examined the role of structural ultraviolet (UV) reflectance and pheromones in the butterfly Colias eurytheme. Both traits are important in mediating interspecific interactions and pheromones have been implicated in intraspecific mate choice. UV reflectance, which arises from the presence of a multilayer thin-film interference array, has potential as an honest indicator of male condition, viability and/or age. We investigated the relevance of these signal traits to courtship success by releasing virgin females in the path of free-flying males until each female had rejected and accepted at least one male. This design facilitated a within-subjects (females) analysis of mate choice, thus controlling for potentially confounding variation in intrinsic female receptivity. Principal component analysis indicated that variation across males in UV brightness and pheromones was essentially orthogonal. Females preferred younger males (as subjectively adjudged by wing wear), and while age covaried with UV brightness and almost all pheromone descriptors, UV brightness emerged as the best and most general predictor of male mating success. Our results suggest that this trait serves as an important intraspecific sexual signal in C. eurytheme, and they provide the clearest evidence to date regarding the functional relevance of structural coloration to female mate choice in butterflies. We discuss the preferential use of one secondary sexual characteristic (UV reflectance) over another (pheromones) with regard to evolutionary strategies.