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全球分布的硅藻属角毛藻（硅藻纲）的多样性：来自暖温带水域的三个新物种。

Diversity in the Globally Distributed Diatom Genus Chaetoceros (Bacillariophyceae): Three New Species from Warm-Temperate Waters.

作者信息

Li Yang, Boonprakob Atchaneey, Gaonkar Chetan C, Kooistra Wiebe H C F, Lange Carina B, Hernández-Becerril David, Chen Zuoyi, Moestrup Øjvind, Lundholm Nina

机构信息

Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Science, South China Normal University, Guangzhou, P. R. China.

Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark.

出版信息

PLoS One. 2017 Jan 13;12(1):e0168887. doi: 10.1371/journal.pone.0168887. eCollection 2017.

DOI:10.1371/journal.pone.0168887
PMID:28085887
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5235366/
Abstract

Chaetoceros is one of the most species rich, widespread and abundant diatom genera in marine and brackish habitats worldwide. It therefore forms an excellent model for in-depth biodiversity studies, assessing morphological and genetic differentiation among groups of strains. The global Chaetoceros lorenzianus complex presently comprises three species known to science. However, our recent studies have shown that the group includes several previously unknown species. In this article, 50 strains, mainly from high latitudes and from warm-temperate waters, were examined morphologically and genetically and the results compared with those of field studies from elsewhere. The strains clustered into five groups, two of which are formed by C. decipiens Cleve and C. mitra (Bailey) Cleve, respectively. Their species descriptions are emended based on samples collected close to the type localities. The three other groups are formed by new species, C. elegans sp. nov., C. laevisporus sp. nov. and C. mannaii sp. nov. Characters used to distinguish each species are: orientation of setae, shape and size of the apertures, shape, size and density of the poroids on the setae and, at least in some species, characters of the resting spores. Our aim is to cover the global species diversity in this complex, as correct species delineation is the basis for exploring biodiversity, distribution of organisms, interactions in the food web and effects of environmental changes.

摘要

角毛藻属是全球海洋和咸淡水生境中物种最丰富、分布最广泛且数量最多的硅藻属之一。因此，它构成了深入开展生物多样性研究、评估菌株群体间形态和遗传分化的理想模型。目前，全球洛氏角毛藻复合体已知包含三个科学上已认定的物种。然而，我们最近的研究表明，该群体还包括几个此前未知的物种。在本文中，我们对主要来自高纬度和暖温带水域的50个菌株进行了形态学和遗传学研究，并将结果与其他地方的实地研究结果进行了比较。这些菌株聚为五组，其中两组分别由欺骗角毛藻和梭角毛藻组成。基于在模式产地附近采集的样本，对它们的物种描述进行了修订。另外三组由新物种组成，即秀丽角毛藻、平滑孢子角毛藻和曼氏角毛藻。用于区分每个物种的特征包括：刚毛的方向、孔的形状和大小、刚毛上孔纹的形状、大小和密度，以及至少在某些物种中，休眠孢子的特征。我们的目标是涵盖该复合体的全球物种多样性，因为正确的物种划分是探索生物多样性、生物分布、食物网中的相互作用以及环境变化影响的基础。

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