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首页> 外文期刊>Protist >Formal Revision of the Alexandrium tamarense Species Complex (Dinophyceae) Taxonomy: The Introduction of Five Species with Emphasis on Molecular-based (rDNA) Classification
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Formal Revision of the Alexandrium tamarense Species Complex (Dinophyceae) Taxonomy: The Introduction of Five Species with Emphasis on Molecular-based (rDNA) Classification

机译：亚历山大属植物群（Dinophyceae）分类的正式修订：强调基于分子（rDNA）分类的五种物种

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The Alexandrium tamarense species complex is one of the most studied marine dinoflagellate groups due to its ecological, toxicological and economic importance. Several members of this complex produce saxitoxin and its congeners - potent neurotoxins that cause paralytic shellfish poisoning. Isolates from this complex are assigned to A. tamarense, A. fundyense, or A. catenella based on two main morphological characters: the ability to form chains and the presence/absence of a ventral pore between Plates 1' and 4'. However, studies have shown that these characters are not consistent and/or distinctive. Further, phylogenies based on multiple regions in the rDNA operon indicate that the sequences from morphologically indistinguishable isolates partition into five clades. These clades were initially named based on their presumed geographic distribution, but recently were renamed as Groups I-V following the discovery of sympatry among some groups. In this study we present data on morphology, ITS/5.8S genetic distances, ITS2 compensatory base changes, mating incompatibilities, toxicity, the sxtA toxin synthesis gene, and rDNA phylogenies. All results were consistent with each group representing a distinct cryptic species. Accordingly, the groups were assigned species names as follows: Group I, A. fundyense; Group II, A. mediterraneum; Group III, A. tamarense; Group IV, A. pacificum; Group V, A. australiense. (C) 2014 Elsevier GmbH. All rights reserved.
机译：由于其生态，毒理学和经济重要性，塔玛亚历山大藻种群是研究最多的海洋鞭毛藻类之一。该复合物的几个成员产生沙毒素及其同类物-引起麻痹性贝类中毒的有效神经毒素。基于两个主要的形态特征，将来自该复合物的分离物分配给番茄，番茄或链霉菌：形成链的能力以及板1'和4'之间的腹孔的存在/不存在。但是，研究表明这些字符不是一致的和/或独特的。此外，基于rDNA操纵子中多个区域的系统发育表明，形态上无法区分的分离物的序列分为五个进化枝。这些进化枝最初是根据其假定的地理分布来命名的，但是最近在发现某些族群之间的共生关系后，将其重命名为I-V群。在这项研究中，我们提供有关形态，ITS / 5.8S遗传距离，ITS2补偿性碱基变化，交配不相容性，毒性，sxtA毒素合成基因和rDNA系统发育的数据。所有结果均与代表不同隐性物种的各组一致。因此，给各组分配了如下物种名称：第一组，A。Fundyense;第二组，地中海曲霉;第三组，A。tamarense;第四组，A。pacificum;第五组，A。australiense。 （C）2014 Elsevier GmbH。版权所有。

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