Benthic diatom flora in supraglacial habitats: a generic-level comparison
Benthic diatom flora in supraglacial habitats: a generic-level comparison
复制标题
冰上栖息地的底栖硅藻区系：一般水平的比较
作者：
M. Yallop;A. Anesio
摘要冰川表面的融水是微生物活动的热点。记录表明，蓝藻和绿色藻类占主导地位的自养组合中发现的底栖碎片在cryoconite孔。硅藻通常记录在极地栖息地内的静水和静水生态系统中，并且根据微生物群落的普遍性原则，可能地，硅藻应该经常在冰上环境的cryoconite中发现。在这项研究中，我们培养的碎片从冰柱材料收集在斯瓦尔巴和格陵兰岛，以促进硅藻的生长。硅藻类属丰富度在12和17之间变化，比以前报道的高1.5倍。Cryoconite支持气生，盐生，epipelic和bryophilic硅藻，表明多个起源的殖民细胞。27个属的培养材料已被冷冻（-20 ° C）超过1年，表明他们的长期低温耐受性。硅藻植物群的组成是类似的记录在相对酸性的北极湖泊的低电导率，和孔的相似性，在属的水平，从陆地/半陆地苔藓群落从北极和南极。随着冰川的退缩，居住在冰尘中的硅藻细胞有可能成为冰前地区及其他地区各种陆地和水生栖息地的播种剂。
Abstract Meltwaters on the surface of glaciers have been identified as hot spots for microbial activity. Records indicate that cyanobacteria and green algae dominate the autotrophic assemblages found in the benthic debris in cryoconite holes. Diatoms are commonly recorded in lentic and lotic ecosystems within polar habitats and, in line with the ubiquity principle for microbial communities, potentially, diatoms should be frequently found in the cryoconite of supraglacial environments. In this study, we cultured debris from cryoconite material collected in Svalbard and Greenland, to promote the growth of diatoms. Diatom generic richness varied between 12 and 17 between sites and was ∼5-fold higher than previously reported. Cryoconite supported aerophytic, halophytic, epipelic and bryophilic diatoms, suggesting multiple origins of colonizing cells. Twenty-seven genera were cultured from material that had been frozen (–20°C) for >1 year, indicating their long-term cryotolerance. The diatom flora composition was similar to that recorded in relatively acidic arctic lakes of low conductivity, and bore similarities at the generic level to those from terrestrial/semi-terrestrial moss communities from both the Arctic and Antarctic. As glaciers retreat, the diatom cells residing in cryoconite have the potential to act as seeding agents for a variety of terrestrial and aquatic habitats in proglacial regions and beyond.
影响因子：
11.6
作者：
Anesio, Alexandre M.;Hodson, Andrew J.;Sattler, Birgit
通讯作者：
Sattler, Birgit