Standen Emily M, Du Trina Y, Laroche Philippe, Larsson Hans C E
Redpath Museum, McGill University, 859 Sherbrooke St. W., Montreal, QC H3A 0C4, Canada.
Redpath Museum, McGill University, 859 Sherbrooke St. W., Montreal, QC H3A 0C4, Canada.
Zoology (Jena). 2016 Oct;119(5):447-454. doi: 10.1016/j.zool.2016.05.001. Epub 2016 May 11.
Amphibious fishes show wide variation in form and function. Examination of terrestrial locomotion in fishes has largely focused on highly specialized taxa. From an evolutionary perspective we are interested in how relatively unspecialized fishes locomote when exposed to different terrestrial environments. In this study, we explore the locomotory repertoire of the basal actinopterygian Polypterus senegalus. We describe its terrestrial locomotory strategies on different surfaces and compare them with steady aquatic locomotion. Our study is the first to describe axial and appendicular-based terrestrial locomotion across a range of substrates in this species and shows two distinct terrestrial gaits in P. senegalus, each with substantial variation. One uses body undulation against complex surfaces and the other incorporates alternating, supportive pectoral fins to achieve a tetrapod-like gait. Gait use is correlated with substrate. P. senegalus uses body and pectoral fins in diverse ways, showing opportunistic and flexible strategies of navigating novel environments.
两栖鱼类在形态和功能上表现出广泛的差异。对鱼类陆地运动的研究主要集中在高度特化的类群上。从进化的角度来看，我们感兴趣的是相对未特化的鱼类在接触不同陆地环境时如何运动。在这项研究中，我们探索了基干辐鳍鱼塞内加尔多鳍鱼的运动方式。我们描述了它在不同表面上的陆地运动策略，并将其与稳定的水生运动进行比较。我们的研究首次描述了该物种在一系列基质上基于轴向和附肢的陆地运动，并显示塞内加尔多鳍鱼有两种不同的陆地步态，每种步态都有很大的变化。一种是利用身体波动在复杂表面上移动，另一种是结合交替的、起到支撑作用的胸鳍来实现类似四足动物的步态。步态的使用与基质相关。塞内加尔多鳍鱼以多种方式使用身体和胸鳍，展示了在新环境中导航的机会主义和灵活策略。
