Selection drives divergence of eye morphology in sympatric Heliconius butterflies.

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY
Evolution Pub Date : 2024-07-01 DOI:10.1093/evolut/qpae073
Daniel Shane Wright, Juliana Rodriguez-Fuentes, Lisa Ammer, Kathy Darragh, Chi-Yun Kuo, W Owen McMillan, Chris D Jiggins, Stephen H Montgomery, Richard M Merrill
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引用次数: 0

Abstract

When populations experience different sensory conditions, natural selection may favor sensory system divergence, affecting peripheral structures and/or downstream neural pathways. We characterized the outer eye morphology of sympatric Heliconius butterflies from different forest types and their first-generation reciprocal hybrids to test for adaptive visual system divergence and hybrid disruption. In Panama, Heliconius cydno occurs in closed forests, whereas Heliconius melpomene resides at the forest edge. Among wild individuals, H. cydno has larger eyes than H. melpomene, and there are heritable, habitat-associated differences in the visual brain structures that exceed neutral divergence expectations. Notably, hybrids have intermediate neural phenotypes, suggesting disruption. To test for similar effects in the visual periphery, we reared both species and their hybrids in common garden conditions. We confirm that H. cydno has larger eyes and provide new evidence that this is driven by selection. Hybrid eye morphology is more H. melpomene-like despite body size being intermediate, contrasting with neural trait intermediacy. Overall, our results suggest that eye morphology differences between H. cydno and H. melpomene are adaptive and that hybrids may suffer fitness costs due to a mismatch between the peripheral visual structures and previously described neural traits that could affect visual performance.

选择驱动了同域蝶类眼睛形态的分化。
当种群经历不同的感官条件时,自然选择可能有利于感官系统的分化,从而影响外围结构和/或下游神经通路。我们对来自不同森林类型的同域榛鸡物种及其第一代互生杂交种的外眼形态进行了表征,以检验适应性视觉系统分化和杂交干扰的可能性。在巴拿马,Heliconius cydno生活在封闭的森林中,而Heliconius melpomene则生活在森林边缘。在野生个体中,Heliconius cydno的眼睛比Heliconius melpomene大,视觉脑部结构存在与栖息地相关的遗传差异,这种差异超出了中性分化的预期。值得注意的是,杂交种具有中间神经表型,表明存在干扰。为了测试视觉外围是否存在类似的影响,我们在普通花园条件下饲养了这两个物种及其杂交种。我们证实 H. cydno 有更大的眼睛,并提供了新的证据证明这是选择驱动的结果。杂交种的眼睛形态更像H. melpomene,尽管体型处于中间位置,这与神经性状的中间性形成了鲜明对比。总之,我们的研究结果表明,H. cydno和H. melpomene之间的眼睛形态差异是适应性的,杂交种可能会因为外围视觉结构与之前描述的可能影响视觉表现的神经特征不匹配而付出适应性代价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Evolution
Evolution 环境科学-进化生物学
CiteScore
5.00
自引率
9.10%
发文量
0
审稿时长
3-6 weeks
期刊介绍: Evolution, published for the Society for the Study of Evolution, is the premier publication devoted to the study of organic evolution and the integration of the various fields of science concerned with evolution. The journal presents significant and original results that extend our understanding of evolutionary phenomena and processes.
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