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Phylogeny of ulotrichalean algae from extreme high-altitude and high-latitude ecosystems

机译:极高海拔和高纬度生态系统中的Ulotrichalean藻类系统发育

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Photosynthetic microbes are the dominant primary producers in plant-free high-elevation and high-latitude ecosystems, but we know very little about the terrestrial algae that are found in these systems. Here, we show that terrestrial algae in the Ulotrichales are the dominant 18S algal phylotypes (in terms of relative abundance) in culture-independent studies of geologically similar but geographically distant periglacial sites in the mountains of Central Alaska and the high Himalayas. We further show that these ulotrichalean algae are closely related (using 18S, ITS/5.8S data sets) to several cultured algae from Antarctica and to the dominant ITS algal phylotypes in a recent study of newly deglaciated sediments near the Damma Glacier in Switzerland. Our results further indicate that ulotrichalean algae may play a previously unrecognized role in rock weathering during the earliest stages of primary succession following glacial retreat, but ecological and physiological studies are needed to test this hypothesis.
机译:在无植物的高海拔和高纬度生态系统中,光合微生物是主要的主要生产者,但我们对在这些系统中发现的陆生藻类知之甚少。在这里,我们表明,在阿拉斯加中部山区和喜马拉雅山高地地质相似但地理位置遥远的沿冰地点的与文化无关的研究中,Ulotrichales中的陆生藻类是占优势的18S藻类系统型(就相对丰度而言)。我们进一步显示,在瑞士对Damma冰川附近新近冰川沉积的近期研究中,这些ulotrichalean藻类与南极的几种养殖藻类以及主要的ITS藻类类型密切相关(使用18S,ITS / 5.8S数据集)。我们的研究结果进一步表明,在冰川退缩后的一次演替的最早阶段,Ulotrichalean藻类可能在岩石风化中起着以前未被认识的作用,但是需要生态和生理学研究来检验这一假设。

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