Metabolic influence of psychrophilic diatoms on travertines at the Huanglong Natural Scenic District of China.
Metabolic influence of psychrophilic diatoms on travertines at the Huanglong Natural Scenic District of China.
复制标题
黄龙自然风景区嗜冷硅藻对石灰华代谢的影响
DOI：
10.3390/ijerph111213084
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发表时间：
2014-12
影响因子：
--
通讯作者：
Dong H
中科院分区：
文献类型：
--
作者：
Sun S;Dong F;Ehrlich H;Zhao X;Liu M;Dai Q;Li Q;An D;Dong H
硅藻是一种高度多样化的藻类，广泛分布于水生生态系统中，各种物种对最佳生长的营养和温度要求不同。在这里，我们描述了不寻常的喜冷硅藻桥弯藻在一个南极沉积环境在中国西南部的冬季。钙华表面被这些嗜冷硅藻定殖，它们在极冷条件下形成具有活跃代谢活动的胞外多糖物质（EPS）的生物膜。黄龙方解石是典型的单晶方解石，晶胞参数沿a轴和c轴沿着轴具有各向异性的晶格畸变，这种结构暗示了某种程度的代谢介导作用。近边X射线吸收精细结构谱（NEXAFS）结果进一步证实了生物成因的方解石晶格畸变的发生。总之，我们的研究结果表明，在黄龙极冷环境中，嗜冷硅藻的代谢影响可能对促进藻毒素的形成和溶解特别重要。嗜冷硅藻的EPS将保护硅藻免受HCO3−的侵蚀，并在温暖的季节当水回流时为形成硅藻提供模板。
Diatoms are a highly diversified group of algae that are widely distributed in aquatic ecosystems, and various species have different nutrient and temperature requirements for optimal growth. Here, we describe unusual psychrophilic diatoms of Cymbella in a travertine deposition environment in southwestern China in winter season. Travertine surfaces are colonized by these psychrophilic diatoms, which form biofilms of extracellular polysaccharide substances (EPS) with active metabolic activities in extremely cold conditions. The travertine in Huanglong, is a typical single crystalline calcite with anisotropic lattice distortions of unit cell parameters along axes of a and c, and this structure is suggestive of some level of metabolic mediation on mineralization. Near-edge X-ray absorption fine structure spectroscopy (NEXAFS) results further confirmed the occurrence of biogenic distortion of the crystal lattice of travertine calcite. Overall, our results imply that the metabolic influence of psychrophilic diatoms may be particularly important for promoting formation and dissolution of travertine in extremely cold environments of Huanglong. The EPS of psychrophilic diatoms will protect travertine from HCO3− etching and provide template for forming travertine when water re-flowing, in warm season.
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