Angrizani Rafael C, Malabarba Luiz R
Laboratório de Ictiologia, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul-UFRGS, Av. Bento Gonçalves, 9500, Bloco 4, prédio 43.435. 91501-970 Porto Alegre, RS, Brazil.
Zootaxa. 2018 Feb 28;4388(1):44-60. doi: 10.11646/zootaxa.4388.1.3.
The eustatic movements triggered by glaciations during the Quaternary have shaped the landscape of Brazilian Atlantic Coast. Cyclic sea-level changes either isolated or connected freshwater fish populations, impacting their distribution and diversification. Rhamdia quelen has been widely recorded from the Brazilian Atlantic Coastal rivers, but it is also considered a species complex. A phylogeographic study carried out using three molecular markers of mtDNA and one of nDNA in the populations of Rhamdia from the hydrographic basins of Southern Atlantic Coast of Brazil recovered three evolutionarily distinct groups: one represented by the populations found in lowlands of all studied watersheds; the second group composed of populations found in the upper tributaries of the rio Araranguá, rio Mampituba and rio Tramandaí; and a third group found exclusively in the upper portions of rio Tubarão. The genetic divergences among these three lineages of Rhamdia is discussed according to sea level changes in the Quaternary. Two new species of Rhamdia are diagnosed and described based on morphological and molecular evidence.
第四纪冰川作用引发的海平面变动塑造了巴西大西洋海岸的地貌。周期性的海平面变化使淡水鱼种群要么相互隔离，要么相互连通，影响了它们的分布和多样性。奎氏溪蟾在巴西大西洋沿岸河流中被广泛记录，但它也被认为是一个物种复合体。利用线粒体DNA的三个分子标记和核DNA的一个分子标记，对巴西南部大西洋海岸流域的奎氏溪蟾种群进行了系统地理学研究，发现了三个进化上不同的群体：一个群体由所有研究流域低地发现的种群代表；第二组由在阿拉兰瓜河、曼皮图巴河和特兰曼代河上游支流中发现的种群组成；第三组仅在图巴朗河上游部分发现。根据第四纪海平面变化讨论了奎氏溪蟾这三个谱系之间的遗传差异。基于形态学和分子证据，诊断并描述了两种新的奎氏溪蟾物种。
