New and interesting aerial diatom assemblages from southwestern Iceland
New and interesting aerial diatom assemblages from southwestern Iceland
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DOI：
10.11646/phytotaxa.428.3.2
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发表时间：
2020-01-14
期刊：
影响因子：
1.1
通讯作者：
Lowe, Rex L.
中科院分区：
文献类型：
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作者：
Furey, Paula C.;Manoylov, Kalina M.;Lowe, Rex L.
对来自地球仪周围空气环境的藻类组合的检查，特别是那些来自瀑布下或泉水和渗漏周围潮湿岩石上发现的假空气栖息地的藻类组合，揭示了独特的硅藻植物群的存在。然而，来自冰岛等北方地区的硅藻组合仍然没有得到充分研究，特别是那些来自火山岩露头和巨石的硅藻组合，这些岩石和巨石创造了生物群从大气或岩石本身获得水分的天然栖息地。在2013年和2015年的夏天，我们研究了主要是真气生的，但也pseudoaerative，硅藻组合的生物多样性，从冰岛西南部的景观火山岩露头或大巨石收集。我们使用光学和扫描电子显微镜来记录常见的，较小的，新的或有趣的标本，如湿生和Eunotia的生物多样性。本文描述了喜湿菌属一新种，H. eldfjallii sp. nov.，具三波状的瓣叶边缘，并包括另一个未识别分类群的信息，Humidophila sp. 1，舟形，末端逐渐变细至圆形，连续的条纹贯穿瓣叶的长度，和圆形的中心区域。我们正式将Diadesmis contenta var.从湿菌到二头肌为了纠正命名错误，我们在种的水平上对平行湿生菌进行了分类。硅藻种群的相对丰度估计提供了这些栖息地的组合的进一步表征。湿生菌属（Humidophila taxa），尤其是H. gallica占多样性硅藻植物群的优势。我们讨论的适应生存与访问主要是大气水。这里描述的硅藻植物群增加了该地区的植物群，突出了硅藻组合的多样性，可以栖息在euaerial环境，并提供了硅藻在极端栖息地的适应性成功的证据，有限的水分和养分。
Examination of algal assemblages from aerial environments around the globe, especially those from pseudoaerial habitats found on moistened rocks underneath waterfalls or around springs and seeps, reveals the presence of unique diatom floras. Yet, diatom assemblages from northern regions like Iceland remain understudied, especially those from the volcanic rock outcrops and boulders that create euaerial habitats where biota receive moisture from the atmosphere or the rock itself. During the summers of 2013 and 2015, we examined the biodiversity of mostly euaerial, but also pseudoaerial, diatom assemblages collected from volcanic rock outcrops or large boulders on the landscape from southwestern Iceland. We used light and scanning electron microscopy to document the biodiversity of common, smaller, new, or interesting specimens, such as Humidophila and Eunotia. We describe one new Humidophila species, H. eldfjallii sp. nov., with triundulate valve margins and include information on another unidentified taxon, Humidophila sp. 1, naviculoid in shape with tapering to rounded ends, continuous striae through the length of the valve, and a circular central area. We formally transfer Diadesmis contenta var. biceps to Humidophila biceps. To correct the nomenclature, we recognized Humidophila parallela at the species level. Relative abundance estimates of diatom populations provided further characterization of the assemblages on these habitats. Humidophila taxa, especially H. gallica dominated the diverse diatom flora. We discuss adaptations for survival with access to mostly atmospheric water. The diatom flora described here adds to the flora for this region, highlights the diversity of diatom assemblages that can inhabit euaerial environments, and provides evidence of adaptive success of diatoms in extreme habitats with limited moisture and nutrients.