Ultraviolet sexual dimorphism and assortative mating in blue tits
Ultraviolet sexual dimorphism and assortative mating in blue tits
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DOI：
10.1098/rspb.1998.0315
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发表时间：
1998-03-22
影响因子：
4.7
通讯作者：
Andersson, M
中科院分区：
文献类型：
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作者：
Andersson, S;Örnborg, J;Andersson, M
蓝山雀（Parus caeruleus）的性选择和性比调节是基于生存力的，尽管有强有力的证据，但蓝山雀几乎是性单态的，没有发现交配信号。然而，还没有研究过其羽毛颜色与鸟类视觉（CV-A波段，320-400 nm）的关系。使用分子性别决定和UV/维斯光谱，我们在这里报告说，蓝山雀是性二色性的UV/蓝色光谱纯度（色度）的辉煌冠补丁。在求偶时，通过水平的姿态和竖立的项羽来展示。一个以前未描述的两性异形冠大小（控制身体大小）进一步支持其作为一个epigamic装饰的作用。对'灰棕色'落叶和树皮在早春形成对，但也对绿色植被，紫外线有助于强烈的显着性和性二型性。这应该进一步加强了紫外线/蓝色的清晨天窗（'林地阴影'），其中蓝色山雀显示在18个繁殖对，有很强的排斥交配的紫外线色度，但不是大小，冠饰。我们的结论是，蓝山雀是显着的性别二态性在自己的视觉世界，紫外线/紫色着色可能发挥作用，在蓝山雀交配收购。
In spite of strong evidence for viability-based sexual selection and sex ratio adjustments, the blue tit, Parus caeruleus, is regarded as nearly sexually monomorphic and no epigamic signals have been found. The plumage coloration has not, however, been studied in relation to bird vision, which extends to the CV-A waveband (320-400 nm). Using molecular sex determination and UV/VIS spectrometry, we report here that blue tits are sexually dichromatic in UV/blue spectral purity (chroma) of the brilliant crown patch. It is displayed in courtship by horizontal Posturing and erected nape feathers. A previously undescribed sexual dimorphism in crown size (controlling for body size) further supports its role as an epigamic ornament. Against 'grey-brown' leaf litter and bark during pair formation in early spring, but also against green vegetation, UV contributes strongly to conspicuousness and sexual dimorphism. This should be further enhanced by the UV/bluish early morning skylight ('woodland shade') in which blue tits display Among 18 breeding pairs, there was strong assortative mating with respect to UV chroma, but not size, of the crown ornament. We conclude that blue tits are markedly sex dimorphic in their own visual world, and that UV/violet coloration probably plays a role in blue tit mate acquisition.