Centers of endemism of freshwater protists deviate from pattern of taxon richness on a continental scale
Centers of endemism of freshwater protists deviate from pattern of taxon richness on a continental scale
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DOI：
10.1038/s41598-020-71332-z
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发表时间：
2020-09
影响因子：
4.6
通讯作者：
Jana L. Olefeld;C. Bock;M. Jensen;Janina C. Vogt;G. Sieber;D. Albach;J. Boenigk
中科院分区：
文献类型：
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作者：
Jana L. Olefeld;C. Bock;M. Jensen;Janina C. Vogt;G. Sieber;D. Albach;J. Boenigk
在这里，我们分析了在欧洲的淡水原生生物的类群丰富性和特有性的模式。即使物理化学参数的意义，但也记录了原生生物分布的地理限制，它仍然不清楚高原生生物多样性的区域位于何处，以及高类群丰富度的地区是否有高比例的特有种。此外，模式可能是普遍的原生生物或分类群体之间的偏离。基于针对rDNA的SSU和ITS区域的扩增子测序活动，我们在两个不同的系统发育分辨率水平上解决这些模式。我们的分析表明，原生生物具有有限的地理分布区。对于许多分类群来说，高分类群丰富度的区域偏离那些具有高比例的假定特有种的区域。特别是，高山湖泊的多样性作为非地带性栖息地偏离周围的低地，即许多分类群只在高山湖泊中发现，一些pupelium特有分类群发生在阿尔卑斯山，比利牛斯山或中央地块等山区。除此之外，分类组显示出明显的积累，推定的特有种在不同的地区，例如甲藻沿着波罗的海海岸线，并在斯堪的纳维亚半岛的甲藻。许多其他群体没有明显的地方特有性增加的地区，但在欧洲各地发现了地理限制的类群。
Here, we analyzed patterns of taxon richness and endemism of freshwater protists in Europe. Even though the significance of physicochemical parameters but also of geographic constraints for protist distribution is documented, it remains unclear where regional areas of high protist diversity are located and whether areas of high taxon richness harbor a high proportion of endemics. Further, patterns may be universal for protists or deviate between taxonomic groups. Based on amplicon sequencing campaigns targeting the SSU and ITS region of the rDNA we address these patterns at two different levels of phylogenetic resolution. Our analyses demonstrate that protists have restricted geographical distribution areas. For many taxonomic groups the regions of high taxon richness deviate from those having a high proportion of putative endemics. In particular, the diversity of high mountain lakes as azonal habitats deviated from surrounding lowlands, i.e. many taxa were found exclusively in high mountain lakes and several putatively endemic taxa occurred in mountain regions like the Alps, the Pyrenees or the Massif Central. Beyond that, taxonomic groups showed a pronounced accumulation of putative endemics in distinct regions, e.g. Dinophyceae along the Baltic Sea coastline, and Chrysophyceae in Scandinavia. Many other groups did not have pronounced areas of increased endemism but geographically restricted taxa were found across Europe.