Laboratório de Genética & Biodiversidade, Instituto de Ciências da Educação, Universidade Federal do Oeste do Pará, Santarém, Pará, Brazil.
Programa de Pós Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, Santarém, Pará, Brazil.
PLoS One. 2018 Dec 21;13(12):e0209430. doi: 10.1371/journal.pone.0209430. eCollection 2018.
The Amazon basin harbors a megadiverse fish fauna spread in an intricate network of big rivers and small streams. The Amazonian streams are home of many small sized fishes that remains poorly documented. In order to accelerate the scientific knowledge on these important aquatic systems we adopted a modern integrative approach joining morphology and molecular tools to investigate the ichthyofauna assemblages from low order streams situated on the lower Tapajós River Basin. Cytochrome c Oxidase I (COI) DNA barcodes from 252 specimens collected from 10 stream sites were obtained. The combined analysis revealed 29 species, 21 genera and 11 families. Cryptic diversity was evidenced in Knodus sp.1, Aequidens epae and Copella callolepis, in which deep genetic divergence were detected (intraspecific distances: 20.48%, 7.99% and 3.77%, respectively). The putative new species showed closer relationships with their counterparts occurring in the Tapajós-Xingu water drainages.
亚马逊盆地拥有丰富多样的鱼类，分布在错综复杂的大河和小溪网络中。亚马逊溪流是许多小型鱼类的家园，这些鱼类的资料仍然很少。为了加速对这些重要水生系统的科学认识，我们采用了一种现代的综合方法，将形态学和分子工具结合起来，研究位于下塔帕若斯河流域的低阶溪流的鱼类群落。从 10 个溪流地点采集的 252 个标本中获得了细胞色素 c 氧化酶 I（COI）DNA 条码。综合分析揭示了 29 种、21 属和 11 科。在 Knodus sp.1、Aequidens epae 和 Copella callolepis 中发现了隐种多样性，这些种的遗传分化很深（种内距离分别为 20.48%、7.99%和 3.77%）。推测的新种与在塔帕若斯-欣古水系中发现的同类种关系更为密切。
