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首页> 外文期刊>Journal of Applied Ichthyology >MOTU analysis of ichthyoplankton biodiversity in the upper Yangtze River, China
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MOTU analysis of ichthyoplankton biodiversity in the upper Yangtze River, China

机译：长江上游鱼类浮游生物多样性的MOTU分析

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Identification of ichthyoplankton is difficult because fish during early life stages often lack stable morphological characteristics; such difficulty in species identification can be a major hindrance in conducting ichthyoplankton surveys for fish biodiversity investigations. Here, we evaluated the feasibility of a molecular operational taxonomic unit (MOTU) approach for ichthyoplankton investigations, and describe fish biodiversity in the Jinshajiang section of the upper Yangtze River, China. The MOTUs were established by grouping specimens diverging less than 1.00% Kimura two-parameter (K2P) distance units from their nearest neighbor within the same MOTU, based on previous work on between-species divergences of the mitochondrial cytochrome C oxidase subunit I (COI) gene. Taxonomic assignment of the MOTUs was performed by comparing the MOTU sequences with the COI sequences of taxonomic species. Sixty-eight MOTUs were inferred from 818 COI sequences of ichthyoplankton in the Jinshajiang river section. Among those, one MOTU was composed of two identified taxonomic species, and each of the other MOTUs was linked to a single, identified taxonomic species. Only 26 MOTUs were successfully identified to taxonomic species due to the limited reference database. Our results demonstrate that the MOTU approach can be applied successfully for analyzing biodiversity and identifying species of freshwater ichthyoplankton. Compared with previous ichthyoplankton investigations the richness of ichthyoplankton was very high. High diversity of ichthyoplankton noted in our study suggests that the Jinshajiang section should be an important target for fish biodiversity conservation in the Yangtze River.
机译：由于鱼在生命的早期常常缺乏稳定的形态特征，因此很难鉴定鱼鳞浮游生物。这种物种识别的困难可能是进行鱼类浮游生物调查以进行鱼类生物多样性调查的主要障碍。在此，我们评估了分子操作分类单位（MOTU）方法用于鱼鳞浮游生物调查的可行性，并描述了长江上游金沙江段的鱼类生物多样性。 MOTU是根据先前关于线粒体细胞色素C氧化酶亚基I（COI）的种间差异的工作，通过将与同一MOTU中距离其最近邻居的距离小于1.00％木村两参数（K2P）距离单位的标本分组而建立的。基因。通过将MOTU序列与分类物种的COI序列进行比较，可以对MOTU进行分类分配。从金沙江断面浮游鱼的818个COI序列推算出68个MOTU。其中，一个MOTU由两个已识别的分类物种组成，其他每个MOTU与一个已识别的分类物种相连。由于参考数据库有限，仅成功分类了26种MOTU。我们的结果表明，MOTU方法可以成功地用于分析生物多样性和识别淡水鱼浮游生物的种类。与以前的鱼鳞浮游动物调查相比，鱼鳞浮游生物的丰富度很高。在我们的研究中，浮游鱼类的高度多样性表明，金沙江段应该是长江鱼类生物多样性保护的重要目标。

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