True UV color vision in a female butterfly with two UV opsins
True UV color vision in a female butterfly with two UV opsins
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DOI：
10.1242/jeb.242802
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发表时间：
2021-09-01
影响因子：
2.8
通讯作者：
Briscoe, Adriana D.
中科院分区：
文献类型：
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作者：
Finkbeiner, Susan D.;Briscoe, Adriana D.
在真彩色视觉中，动物使用至少两个具有不同光谱敏感度峰值的光感受器来区分光波长，而不管强度如何。Heliconius蝴蝶有重复的UV视蛋白基因，分别编码紫外线和紫色光感受器。在Heliconius erato中，只有雌性表达紫外光感受器，这表明雌性（而不是雄性）可以区分紫外线波长。我们测试了H. erato和两个缺乏紫色受体的物种，Heliconius melpomene和Euedes isabella，在接受训练将每个刺激与糖奖励联系起来后，能够区分380和390 nm以及400和436 nm。我们发现，只有H。雌性的色觉在紫外线范围内。在不同的物种中，两性都显示出蓝色范围内的色觉。H. erato色觉表明，女性有一个优势，男性在区分内部的紫外线黄色花冠的Psiguria花从他们的外部橙子花瓣。此外，先前的模型（McCulloch等人，2017）提出H.在区分Heliconius 3-hydroxykynurenine（3-OHK）黄色翅着色与在其他Heliconiines中发现的非3-OHK黄色翅着色方面，雄性雄性比雌性具有优势。这些结果提供了一些关于雌性H. erato UV颜色辨别在觅食的背景下，支持该假设（Eschercoe等人，2010），复制的UV视蛋白基因在UV色觉中一起起作用。综合考虑，H. erato似乎是由性选择和性别特异性自然选择共同塑造的。
In true color vision, animals discriminate between light wavelengths, regardless of intensity, using at least two photoreceptors with different spectral sensitivity peaks. Heliconius butterflies have duplicate UV opsin genes, which encode ultraviolet and violet photoreceptors, respectively. In Heliconius erato, only females express the ultraviolet photoreceptor, suggesting females (but not males) can discriminate between UV wavelengths. We tested the ability of H. erato, and two species lacking the violet receptor, Heliconius melpomene and Eueides isabella, to discriminate between 380 and 390 nm, and between 400 and 436 nm, after being trained to associate each stimulus with a sugar reward. We found that only H. erato females have color vision in the UV range. Across species, both sexes show color vision in the blue range. Models of H. erato color vision suggest that females have an advantage over males in discriminating the inner UV-yellow corollas of Psiguria flowers from their outer orange petals. Moreover, previous models (McCulloch et al., 2017) suggested that H. erato males have an advantage over females in discriminating Heliconius 3-hydroxykynurenine (3-OHK) yellow wing coloration from non-3-OHK yellow wing coloration found in other heliconiines. These results provide some of the first behavioral evidence for female H. erato UV color discrimination in the context of foraging, lending support to the hypothesis (Briscoe et al., 2010) that the duplicated UV opsin genes function together in UV color vision. Taken together, the sexually dimorphic visual system of H. erato appears to have been shaped by both sexual selection and sex-specific natural selection.