Max Planck Institute for Chemical Ecology, Department of Evolutionary Neuroethology, Hans-Knöll-Straße 8, D-07745, Jena, Germany.
Department of Biochemistry and Biotechnology, Technical University of Kenya, Haille-Sellasie Avenue, Workshop Road, 0200, Nairobi, Kenya.
Nat Commun. 2019 Mar 11;10(1):1162. doi: 10.1038/s41467-019-09087-z.
Divergent populations across different environments are exposed to critical sensory information related to locating a host or mate, as well as avoiding predators and pathogens. These sensory signals generate evolutionary changes in neuroanatomy and behavior; however, few studies have investigated patterns of neural architecture that occur between sensory systems, or that occur within large groups of closely-related organisms. Here we examine 62 species within the genus Drosophila and describe an inverse resource allocation between vision and olfaction, which we consistently observe at the periphery, within the brain, as well as during larval development. This sensory variation was noted across the entire genus and appears to represent repeated, independent evolutionary events, where one sensory modality is consistently selected for at the expense of the other. Moreover, we provide evidence of a developmental genetic constraint through the sharing of a single larval structure, the eye-antennal imaginal disc. In addition, we examine the ecological implications of visual or olfactory bias, including the potential impact on host-navigation and courtship.
不同环境中的分化种群暴露于与寻找宿主或配偶以及避免捕食者和病原体相关的关键感觉信息。这些感觉信号在神经解剖结构和行为上产生了进化变化；然而，很少有研究调查过发生在感觉系统之间或在密切相关的生物体的大群体中发生的神经结构模式。在这里，我们研究了果蝇属中的 62 个物种，并描述了视觉和嗅觉之间的逆向资源分配，我们在周围环境、大脑内部以及幼虫发育过程中都一致地观察到了这种现象。这种感觉变化在整个属中都有出现，似乎代表了反复的、独立的进化事件，其中一种感觉方式始终被选择，而另一种则被牺牲。此外，我们通过共享单个幼虫结构——眼触角 imaginal 盘，提供了发育遗传限制的证据。此外，我们还研究了视觉或嗅觉偏好的生态影响，包括对宿主导航和求偶的潜在影响。
