用形态学和分子特征区分大西洋全深海马尾藻的常见形态类型

Phycology Pub Date : 2024-05-07 DOI:10.3390/phycology4020014
A. Siuda, A. Blanfuné, Skye Dibner, M. Verlaque, C. Boudouresque, S. Connan, Deborah S. Goodwin, V. Stiger-Pouvreau, Frédérique Viard, Florence Rousseau, Valérie Michotey, J. Schell, Thomas Changeaux, D. Aurelle, T. Thibaut
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引用次数: 0

摘要

据报道,自 2011 年以来,加勒比海、巴西北部、圭亚那和西非海岸又发生了大规模的全层马尾藻搁浅事件,造成了严重的经济和生态破坏。已确定三种常见的马尾藻形态(S. fluitans III、S. natans I 和 S. natans VIII)是这些灾难性事件的罪魁祸首,随着时间的推移,它们之间的优势发生了变化。然而,这些全深海马尾藻形态的分类地位仍不清楚。本研究采用综合分类框架,结合形态学研究和分子分析,旨在明确它们的分类地位。对 54 个特征进行的形态学分析表明,这三种马尾藻形态之间没有中间形态,其中整体形状、轴的性质以及叶片和囊泡的大小和形状最具鉴别力。对线粒体(IGS、cox2、cox3、mt16S rRNA 和 nad6)和质粒(rbcL)标记的分析证实了三种形态之间的遗传差异,而两种 S. natans 形态之间的差异程度较低。在没有其他分子特征鉴定的情况下,这些形态型不能被划分为三个不同的物种。然而,由于它们具有不同的形态特征以及在漂流聚集体中的共生关系,建议对全层物种名称进行修订,将 Fluitans 马尾藻变种(S. fluitans III)、natans 马尾藻变种(S. natans I)和 natans 马尾藻变种(S. natans VIII)命名为 Fluitans 马尾藻变种(S. natans III)、natans 马尾藻变种(S. natans I)和 natans 马尾藻变种(S. natans VIII)。这次修订对热带大西洋淹没涉及的物种进行了必要的澄清。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Morphological and Molecular Characters Differentiate Common Morphotypes of Atlantic Holopelagic Sargassum
Since 2011, massive new strandings of holopelagic Sargassum have been reported on the coasts of the Caribbean, northern Brazil, Guiana, and West Africa, causing severe economic and ecological damage. Three common morphotypes (S. fluitans III, S. natans I, and S. natans VIII) were identified as responsible for these catastrophic events, with dominance shifts between them over time. However, the taxonomic status of these holopelagic Sargassum morphotypes remains unclear. Using an integrative taxonomy framework, combining a morphological study and molecular analyses, this study aimed to clarify their taxonomic status. Morphological analyses of 54 characters revealed no intermediate form between the three morphotypes, with the overall shape, nature of the axis, and size and shape of blades and vesicles being the most discriminating. An analysis of mitochondrial (IGS, cox2, cox3, mt16S rRNA, and nad6) and plastid (rbcL) markers confirmed the genetic divergence among the three morphotypes, with a lower level of divergence between the two S. natans morphotypes. Without additional molecular characterization, these morphotypes cannot be classified as three distinct species. However, due to their distinct morphological characteristics and sympatry within drifting aggregations, a revision of holopelagic species names is proposed, with Sargassum fluitans var. fluitans (for S. fluitans III), Sargassum natans var. natans (for S. natans I), and S. natans var. wingei (for S. natans VIII). This revision provides necessary clarity on the species involved in inundations of the tropical Atlantic.
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