Body Shape Variability of the Minnow Phoxinus phoxinus (Linnaeus, 1758) (Cyprinidae, Actinopterygii) in Large and Small Watercourses of the Sylva River Basin (Middle Urals)

Baranov V. Yu.

摘要

The variability of the body shape of minnows in populations from different-size watercourses of the Sylva River basin (Middle Urals) is studied by geometric morphometrics. Twenty-six homologous landmarks were used to describe the body shape variability of the fish. Four geographically adjacent minnow populations isolated by artificial and natural dams were investigated. More than 56% of the variance of intergroup differences in the body shape is determined by the habitation of minnows in the large watercourse of the main flow (the Sylva River) and its small tributaries (the Lomovka, Musorka, and Sarga rivers). The main-flow minnow is characterized by relatively large eyes, low body, and small short jaws. On the contrary, the tributary minnow is characterized by a relatively high body, small eyes, and long jaws. Along with the significant differentiation of the isolated minnow populations from the main flow and its tributaries, a high level of individual morphological differences was discovered, which indicates some directional change in the fish development trajectory in the population from each watercourse. The discrimination level of individuals reached 97.9%. A low intragroup morphological diversity was revealed for the minnow population in the large watercourse of the Sylva River with a multispecies ichthyological community. Minnows from the small watercourses of the Lomovka, Musorka, and Sarga rivers with a low species diversity have a high intragroup morphological diversity in the body shape. This may indirectly show some ontogenetic change in the individuals from the small tributaries due to the formation of a wide range of ontogenetic trajectories and suggests a high phenotypic plasticity of the species. The role of the hydrological regime in the small watercourses and the role of the taxonomic diversity of fish communities in the formation of the morphological diversity of minnows is hypothesized.

机译：通过几何形态学测定学研究了来自Sylva河流域（中乌拉尔）不同大小的水道群体中小鱼体形状的变异性。使用二十六个同源地标来描述鱼的体形变异性。研究了由人造和天然水坝隔离的四个地理上相邻的Min表现。超过56％的体形差异的差异是通过居住在主要流动（Sylva河）及其小型支流（Lomovka，Musorka和Sarga Rivers）的大型水道中的居住。主流型Min鱼的特点是相对较大的眼睛，低体和小短颌骨。相反，支流Min鱼的特点是相对较高的身体，小眼睛和长颌骨。随着孤立的Minnow群体的显着分化来自主要流动及其支流，发现了高水平的个体形态差异，这表明每次水道人口中的鱼类发育轨迹的某些定向变化。个人的歧视水平达到97.9％。在Sylva河大型水道中的Min鱼群体中揭示了低瘤内的形态多样性，其中有一个多层科学群体。来自Lomovka，Musorka和Sarga Rivers的小型水道的小鱼，具有低物种多样性的高度腹腔形态多样性。由于形成广泛的梭形轨迹，这可能间接地显示来自小支流中的个体的一些植入变化，并表明了物种的高表型可塑性。水文制度在小型水道中的作用以及鱼群在形成米诺洼形态多样性的鱼群中的作用是假设的。

Body Shape Variability of the Minnow Phoxinus phoxinus (Linnaeus, 1758) (Cyprinidae, Actinopterygii) in Large and Small Watercourses of the Sylva River Basin (Middle Urals)

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