Shao Wei-Han, Cheng Jian-Li, Zhang E
Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.
College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China.
Front Genet. 2021 Nov 17;12:713793. doi: 10.3389/fgene.2021.713793. eCollection 2021.
There is increasing evidence that species diversity is underestimated in the current taxonomy of widespread freshwater fishes. The bagrid species s.l. is mainly distributed in the lowlands of South China, as currently identified. A total of 40 localities (including the type locality), which covers most of its known range, were sampled. Molecular phylogenetic analyses based on concatenated mtDNA and nuclear genes recover nine highly supported lineages clustering into eight geographic populations. The integration of molecular evidence, morphological data, and geographic distribution demonstrates the delineation of s.l. as eight putative species. Four species, namely, , , , and sp. nov. and the complex are taxonomically recognized herein. Moreover, sp. nov. comprises two genetically distinct lineages with no morphological and geographical difference. This study also reveals aspects of estimation of divergence time, distribution, and ecological adaption within the group. The unraveling of the hidden species diversity of this lowland bagrid fish highlights the need for not only the molecular scrutiny of widely distributed species of South China but also the adjustment of current biodiversity conservation strategies to protect the largely overlooked diversity of fishes from low-elevation rapids.
越来越多的证据表明，在目前广泛分布的淡水鱼类分类学中，物种多样性被低估了。目前所认定的鲿科鱼类广义上主要分布于中国南方的低地地区。我们对总共40个地点（包括模式产地）进行了采样，这些地点覆盖了其大部分已知分布范围。基于串联线粒体DNA和核基因的分子系统发育分析发现了9个得到高度支持的谱系，这些谱系聚为8个地理种群。分子证据、形态学数据和地理分布的整合表明，鲿科鱼类广义上可划分为8个假定物种。本文在分类学上认可了4个物种，即……、……、……和……新种以及……复合体。此外，……新种包含两个在遗传上不同但在形态和地理上无差异的谱系。本研究还揭示了鲿科鱼类群体内分歧时间估计、分布和生态适应方面的情况。对这种低地鲿科鱼类隐藏的物种多样性的揭示，不仅凸显了对中国南方广泛分布物种进行分子审查的必要性，也强调了调整当前生物多样性保护策略以保护低海拔急流中大量被忽视的鱼类多样性的必要性。
