Laboratory of Functional and Evolutionary Morphology, Freshwater and Oceanic Science Unit of Research, University of Liège, Liège, Belgium.
Fish Passage Center, Federal University of Minas Gerais, Belo Horizonte, Brazil.
J Fish Biol. 2020 Dec;97(6):1676-1680. doi: 10.1111/jfb.14529. Epub 2020 Oct 5.
Serrasalmus marginatus is a piranha species native from the lower Paraná River basin and has been invasive in the upper Paraná River basin since the 1980s. In piranhas, sounds of different species have different features. The aim of this study was to investigate if the sounds produced by this species could be used to distinguish two morphotypes: red- and yellow-eyed S. marginatus from the Araguari River (upper Paraná River basin). All the temporal and frequency features of the sounds were equivalent in both groups of eye colour; it corresponds to the species-specific signature described for S. marginatus. Nonetheless, the amplitude features were all statistically different between red- and yellow-eyed piranhas. Yellow-eyed specimens produced louder sounds. In different fish species, colour change in eyes can be due to the absence or the presence of a dominant allele. It can also be involved in social rank or during reproduction. Different hormones and neuropeptides can modulate vocal features. It is hypothesized that a mutation or different hormonal concentrations could explain both sound amplitude and eye colour playing a role in animal communication in S. marginatus.
缘锯脂鲤原产于巴拉那河下游流域，自 20 世纪 80 年代起已入侵到巴拉那河上游流域。在锯脂鲤属鱼类中，不同物种的声音具有不同的特征。本研究旨在调查该物种发出的声音是否可用于区分两种表型：来自阿拉瓜里河（巴拉那河上游流域）的红眼缘锯脂鲤和黄眼缘锯脂鲤。两组眼颜色的声音的所有时间和频率特征均相同；这与对缘锯脂鲤属鱼类的特征描述一致。尽管如此，红眼和黄眼锯脂鲤的振幅特征在统计学上均存在差异。黄眼标本发出的声音更大。在不同的鱼类物种中，眼睛颜色的变化可能是由于显性等位基因的缺失或存在所致。它也可能涉及社会等级或繁殖期间。不同的激素和神经肽可以调节发声特征。据推测，突变或不同的激素浓度可以解释声音幅度和眼睛颜色在缘锯脂鲤属动物通讯中发挥的作用。
