Endemism, palaeoendemism and migration: the case for the ‘European endemic’, Mallomonas intermedia

Endemism, palaeoendemism and migration: the case for the ‘European endemic’, Mallomonas intermedia
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地方病、古地方病和迁徙:“欧洲地方病”、中间马洛莫单胞菌的案例

DOI:
10.1080/09670262.2018.1544377
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发表时间:
2019
影响因子:
2.4
通讯作者:
Nemcova, Yvonne
Nemcova, Yvonne
中科院分区:
生物学3区
文献类型:
--
作者:
Siver, Peter A.;Skogstad, Asbjørn;Nemcova, Yvonne

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Synurophyceae是一个支持性很强的生态学上重要的异鞭毛藻类分支,主要分布于世界各地的淡水浮游生物栖息地,其成员具有由物种特异性硅质鳞片以高度组织化的方式重叠组成的细胞覆盖物。许多合生植物被描述为地方性的,并且仅在世界的特定区域被发现。在位于美国内华达州维尔京谷的一个偏远沙漠池塘中,以及在加拿大不列颠哥伦比亚省被称为马蝇的始新世中期化石地点的地层序列中,发现了欧洲特有的中间野单胞菌(Mallomonasintermedia)的繁荣种群。这两个北美的发现与欧洲的种群进行了密切的比较,确认了身份。在这些发现之前,该物种仅在欧洲的许多水体中有记录,但在其他大陆的数百个地点中缺乏。在温暖的始新世中期,它在北美洲西部的存在证实了在历史上,这个物种有一个显着更广泛的分布,可能是最好的分类为古特有种。从第二个化石地点发现的其他物种与M密切相关。这进一步支持了始新世期间北美存在这一谱系。北方内华达州的人口是个谜。这个遥远的沙漠种群是否代表了一个至今未被发现的残余种群,或者它是一个未知的媒介最近从一个未知的地区到达的?
The Synurophyceae is a well-supported clade of ecologically important heterokont algae found largely in freshwater planktonic habitats worldwide, whose members have cell coverings consisting of species-specific siliceous scales overlapped in a highly organized manner. Many synurophytes have been described as endemic and are found only in specific regions of the world. A thriving population of the European endemic,Mallomonas intermedia, was discovered in a remote desert pond situated in the Virgin Valley, Nevada, USA and in a stratigraphic sequence from the middle Eocene fossil locality known as Horsefly in British Columbia, Canada. Both North American finds were closely compared with populations from Europe, confirming the identifications. Before these discoveries, this species was recorded from numerous waterbodies exclusively in Europe, but was lacking from hundreds of sites examined from other continents. Its presence in western North America during the warm middle Eocene confirms that historically this species had a significantly wider distribution and may be best classified as a palaeoendemic. Additional species uncovered from a second fossil locality that are closely related toM. intermediafurther support the presence of this lineage in North America during the Eocene. The living population in northern Nevada presents an enigma. Does this remote desert population represent a remnant population that has gone undetected until now, or is it a recent arrival from an unknown region by an unknown vector?
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