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首页> 美国卫生研究院文献>Biology >Timescales of Growth Response of Microbial Mats to Environmental Change in an Ice-Covered Antarctic Lake
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Timescales of Growth Response of Microbial Mats to Environmental Change in an Ice-Covered Antarctic Lake

机译：覆冰的南极湖中微生物垫对环境变化的响应时间尺度

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Lake Vanda is a perennially ice-covered, closed-basin lake in the McMurdo Dry Valleys, Antarctica. Laminated photosynthetic microbial mats cover the floor of the lake from below the ice cover to >40 m depth. In recent decades, the water level of Lake Vanda has been rising, creating a “natural experiment” on development of mat communities on newly flooded substrates and the response of deeper mats to declining irradiance. Mats in recently flooded depths accumulate one lamina (~0.3 mm) per year and accrue ~0.18 µg chlorophyll-a cm−2 y−1. As they increase in thickness, vertical zonation becomes evident, with the upper 2-4 laminae forming an orange-brown zone, rich in myxoxanthophyll and dominated by intertwined Leptolyngbya trichomes. Below this, up to six phycobilin-rich green/pink-pigmented laminae form a subsurface zone, inhabited by Leptolyngbya, Oscillatoria and Phormidium morphotypes. Laminae continued to increase in thickness for several years after burial, and PAM fluorometry indicated photosynthetic potential in all pigmented laminae. At depths that have been submerged for >40 years, mats showed similar internal zonation and formed complex pinnacle structures that were only beginning to appear in shallower mats. Chlorophyll-a did not change over time and these mats appear to represent resource-limited “climax” communities. Acclimation of microbial mats to changing environmental conditions is a slow process, and our data show how legacy effects of past change persist into the modern community structure.
机译：万达湖（Lake Vanda）是南极麦克默多干旱谷（McMurdo Dry Valleys）常年覆冰的封闭盆地湖泊。层状的光合微生物垫从冰盖下方覆盖湖底，深度超过40 m。近几十年来，万达湖的水位一直在上升，这对于在新近被淹没的底物上的垫子群落的发展以及较深的垫子对辐照度下降的响应进行了“自然实验”。最近被淹的深度的垫子每年积聚一层叶片（〜0.3毫米），并产生〜0.18 µg叶绿素-a cm -2 y -1 。随着它们的厚度增加，垂直带变得明显，上部的2-4层形成一个橙棕色区，富含粘多糖叶绿素，并由交织的钩端螺旋体占主导。在此之下，多达六个富藻蓝蛋白的绿色/粉红色薄层形成了一个地下区域，由鳞翅目动物，颤藻和蠕形虫栖息。埋葬后的几年中，薄层的厚度持续增加，PAM荧光法显示所有有色薄层的光合作用潜力。在被淹没超过40年的深度中，垫子表现出相似的内部带状结构，并形成了复杂的尖峰结构，这些结构才开始出现在较浅的垫子中。叶绿素-a不会随时间变化，这些垫子似乎代表了资源有限的“高潮”社区。使微生物垫适应不断变化的环境条件是一个缓慢的过程，我们的数据表明过去变化的遗留效应如何持续存在于现代社区结构中。

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