Abstract

The freshwater stingray Paratrygon aiereba have coloration, osteological and morphometric variations that could suggest the existence of more than one species in Colombia. In order to evaluate the phylogeography, population structure and genetic diversity for P. aiereba distributed in the Amazon and Orinoco basins, we amplified Cytochrome oxidase subunit 1 (COI) partial region of mitochondrial DNA (mtDNA) in 50 samples from eight different sub-basins. Our results suggest three phylogroups and a vicariance event occurred 43 million years ago proposing how Paratrygon diverged into the basins. A high population structure (Φ_ST = 0.692; p < 0.005) and a value of (K) of 3 were defined. A high genetic diversity within phylogroups was found: Phylogroup A (h = 0.64; π% = 2.48), Phylogroup B (h = 0.552; π% = 1.67), and Phylogroup C (h = 0.49; π% = 0.73). These results should be considered in local management plans, conservation programs and reclassification in at least Amazon and Orinoco.

摘要

淡水黄貂鱼（Paratrygon aiereba）的颜色，骨骼和形态特征均可能暗示哥伦比亚存在一种以上的物种。为了评估分布在亚马逊和奥里诺科盆地的艾氏疟原虫的系统志，种群结构和遗传多样性，我们从八个不同亚盆地的50个样品中扩增了线粒体DNA（mtDNA）的细胞色素氧化酶亚基1（COI）部分区域。。我们的研究结果表明，在3,300万年前发生了3个植物群和一次变异事件，提出了Paratrygon如何分散到盆地中的想法。高人口结构（Φ _ST = 0.692; p  定义为<0.005）和（K）值为3。在植物群内发现了高度的遗传多样性：根瘤菌群A（h  = 0.64;π％= 2.48），根瘤菌群B（h  = 0.552;π％= 1.67）和根瘤菌C（h  = 0.49;π％= 0.73）。至少在亚马逊和奥里诺科，应在地方管理计划，保护计划和重新分类中考虑这些结果。