利用几何形态测量学方法分析唐鱼群体的形态变异

发布时间：2018-06-26 01:41

本文选题：唐鱼 + 形态变异　；参考：《水产学报》2017年09期

【摘要】：唐鱼是华南地区小型亚科鱼类的典型代表,国家Ⅱ级保护水生野生动物。本研究利用基于地标点的几何形态测量学方法分析了唐鱼8个野生种群和2个养殖群体的形态变异,旨在从形态学的角度了解唐鱼不同种群间的分化程度,为唐鱼保护策略的制定提供科学依据。新鲜标本冰冻麻醉后随即置于95%酒精中固定,用Nikon D-800单反相机拍照获得固定标本的标准图像。利用tps系列软件提取地标点坐标值,进行相对扭曲主成分分析、网格变形分析和判别分析来解释唐鱼的形态变异。相对扭曲主成分分析结果显示,第1、2、3主成分分别解释了总变异的48.20%、23.12%和14.83%,降维效果较好。其中,Ⅱ型地标点12、13、14和15贡献较大,四者合计贡献率达71.28%,反映出唐鱼群体的形态变异主要表现在眼径大小和头部形态。逐步判别分析和交互验证分析的总体判别正确率分别为97.6%和92.0%,能有效识别唐鱼群体。研究结果还揭示了唐鱼野生种群和养殖群体之间存在显著的形态差异。基于上述结果以及唐鱼呈点状分布的事实,建议将唐鱼的7个野生种群(越南种群除外)各自作为单独的保护单元进行重点保护,同时建议禁止在野外放流养殖群体。
[Abstract]:Tangyu is a typical representative of small subfamily fishes in South China. In this study, the morphological variation of 8 wild populations and 2 cultured populations of Tangyu was analyzed by means of geo-punctuation geometric morphometry. The purpose of this study was to understand the degree of differentiation between different populations of Tangyu from a morphological point of view. It provides the scientific basis for the formulation of the conservation strategy of Tangyu. Fresh specimens were immobilized in 95% alcohol immediately after frozen anesthesia. The standard images of the fixed specimens were obtained by Nikon D-800 SLR camera. The coordinate values of ground punctuation were extracted by tps software, and the relative distortion principal component analysis, grid deformation analysis and discriminant analysis were carried out to explain the morphological variation of Tangyu. The results of relative twisted principal component analysis showed that the principal component No. 1 explained 48.20% and 14.83% of the total variation, and the dimensionality reduction effect was better. The total contribution rate of the four species was 71.28, which showed that the morphological variation of the population was mainly manifested in the size of the eye diameter and the shape of the head. The total discriminant accuracy rates of stepwise discriminant analysis and interactive verification analysis were 97.6% and 92.0% respectively. The results also revealed that there were significant morphological differences between wild and cultured populations. On the basis of the above results and the fact that Tangyu is in the form of point distribution, it is suggested that the seven wild populations (except Vietnamese population) of Tangyu should be protected as separate conservation units, and that it should be prohibited from farmed populations in the wild.
【作者单位】：华南师范大学生命科学学院广州市亚热带生物多样性与环境生物监测重点实验室广东省水产安全健康养殖重点实验室广东省水产优质环保养殖工程技术研究中心;中山大学生命科学学院水生经济动物研究所水产品安全教育部重点实验室;
【基金】：国家自然科学基金(31372178) 公益性行业(农业)科研专项(201303048) 国家科技基础条件平台工作重点项目(2005DKA21402) 华南师范大学研究生创新计划项目(2015lkxm26)~~
【分类号】：S917.4

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