Tuset V M, Otero-Ferrer J L, Gómez-Zurita J, Venerus L A, Stransky C, Imondi R, Orlov A M, Ye Z, Santschi L, Afanasiev P K, Zhuang L, Farré M, Love M S, Lombarte A
Instituto de Ciencias del Mar (CSIC), Barcelona, Spain.
Departamento de Ecoloxía e Bioloxía Animal, Universidad de Vigo, 36310 Vigo (Pontevedra), Spain.
J Evol Biol. 2016 Oct;29(10):2083-2097. doi: 10.1111/jeb.12932. Epub 2016 Jul 21.
The sensory drive hypothesis proposes that environmental factors affect both signalling dynamics and the evolution of signals and receivers. Sound detection and equilibrium in marine fishes are senses dependent on the sagittae otoliths, whose morphological variability appears intrinsically linked to the environment. The aim of this study was to understand if and which environmental factors could be conditioning the evolution of this sensory structure, therefore lending support to the sensory drive hypothesis. Thus, we analysed the otolith shape of 42 rockfish species (Sebastes spp.) to test the potential associations with the phylogeny, biological (age), ecological (feeding habit and depth distribution) and biogeographical factors. The results showed strong differences in the otolith shapes of some species, noticeably influenced by ecological and biogeographical factors. Moreover, otolith shape was clearly conditioned by phylogeny, but with a strong environmental effect, cautioning about the use of this structure for the systematics of rockfishes or other marine fishes. However, our most relevant finding is that the data supported the sensory drive hypothesis as a force promoting the radiation of the genus Sebastes. This hypothesis holds that adaptive divergence in communication has significant influence relative to other life history traits. It has already been established in Sebastes for visual characters and organs; our results showed that it applies to otolith transformations as well (despite the clear influence of feeding and depth), expanding the scope of the hypothesis to other sensory structures.
感官驱动假说认为，环境因素会影响信号动态以及信号和接收器的进化。海洋鱼类的声音探测和平衡依赖于矢耳石，其形态变异似乎与环境存在内在联系。本研究的目的是了解是否以及哪些环境因素可能影响这种感官结构的进化，从而为感官驱动假说提供支持。因此，我们分析了42种岩鱼（Sebastes spp.）的耳石形状，以测试其与系统发育、生物学（年龄）、生态学（摄食习性和深度分布）以及生物地理因素之间的潜在关联。结果显示，某些物种的耳石形状存在显著差异，明显受到生态和生物地理因素的影响。此外，耳石形状明显受系统发育的制约，但环境影响也很大，这提醒人们在将这种结构用于岩鱼或其他海洋鱼类的系统分类时需谨慎。然而，我们最相关的发现是，数据支持感官驱动假说，认为它是促进Sebastes属辐射进化的一种力量。该假说认为，与其他生活史特征相比，通讯方面的适应性分化具有重大影响。在Sebastes属中，视觉特征和器官方面已经证实了这一点；我们的结果表明，这一假说同样适用于耳石的变化（尽管摄食和深度有明显影响），从而将该假说的范围扩展到了其他感官结构。
