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首页> 外文期刊>Applied and Environmental Microbiology >Diel Vertical Movements of the Cyanobacterium Oscillatoria terebriformis in a Sulfide-Rich Hot Spring Microbial Mat
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Diel Vertical Movements of the Cyanobacterium Oscillatoria terebriformis in a Sulfide-Rich Hot Spring Microbial Mat

机译：富含硫化物的温泉微生物垫中蓝藻颤藻的狄尔垂直运动

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摘要

Oscillatoria terebriformis, a thermophilic cyanobacterium, carried out a diel vertical movement pattern in Hunter's Hot Springs, Oreg. Throughout most daylight hours, populations of O. terebriformis covered the surface of microbial mats in the hot spring outflows below an upper temperature limit of 54°C. Upon darkness trichomes moved downward by gliding motility into the substrate to a depth of 0.5 to 1.0 mm, where the population remained until dawn. At dawn the population rapidly returned to the top of the mats. Field studies with microelectrodes showed that the dense population of O. terebriformis moved each night across an oxygen-sulfide interface, entering a microenvironment which was anaerobic and reducing, a dramatic contrast to the daytime environment at the mat surface where oxygenic photosynthesis resulted in supersaturated O2. Laboratory experiments on motility with the use of sulfide gradients produced in agar revealed a negative response to sulfide at concentrations similar to those found in the natural mats. The motility response may help explain the presence of O. terebriformis below the mat surface at night. The movement back to the surface at dawn appears to be due to a combination of phototaxis, photokinesis, and the onset of oxygenic photosynthesis which consumes sulfide.
机译：嗜热蓝细菌Oscillatoria terebriformis在俄勒冈州的Hunter's Hot Springs进行了diel垂直运动。在大多数白天，在低于温度上限54°C的温泉水流中，粉蝶菌的种群覆盖了微生物垫的表面。在黑暗中，毛线虫通过向底物滑动而向下移动到0.5到1.0毫米的深度，在那里种群一直呆到黎明。黎明时分，人口迅速回到垫子的顶端。用微电极进行的野外研究表明，密集的Terebriformis种群每晚穿过氧气-硫化物界面移动，进入一个无氧且还原的微环境，这与垫子表面的白天环境形成了鲜明的对比，在该环境中，氧的光合作用导致过饱和的O2 。利用琼脂中产生的硫化物梯度进行的运动性实验室实验显示，在与天然垫子中所见浓度相似的浓度下，对硫化物产生了负面反应。蠕动反应可能有助于解释夜间在垫子表面以下存在骨粉虫。黎明时返回地面的运动似乎是由于趋光性，光合作用和开始消耗硫化物的光合作用的综合作用。

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