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首页> 外文期刊>International Journal of Astrobiology >Prospects for metazoan life in sub-glacial Antarctic lakes: the most extreme life on Earth?
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Prospects for metazoan life in sub-glacial Antarctic lakes: the most extreme life on Earth?

机译：亚冰川南极湖泊中美氮菜生活的前景：地球上最极端的生活？

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摘要

About 400 subglacial lakes are known from Antarctica. The question of whether life unique of subglacial lakes exists has been paramount since their discovery. Despite frequent evidence of microbial life mostly from accretion ice, subglacial lakes are characterized by physiologically hostile conditions to metazoan life, as we know it. Pure water (salinity <= 0.4-1.2%), extreme cold (-3 degrees C), high hydrostatic pressure, areas of limited or no oxygen availability and permanent darkness altogether require physiological adaptations to these harsh conditions. The record of gene sequences including some associated with hydrothermal vents does foster the idea of metazoan life in Lake Vostok. Here, we synthesize the physico-chemical environment surrounding sub-glacial lakes and potential sites of hydrothermal activity and advocate that the physico-chemical stability found at these sites may be the most likely sites for metazoan life to exist. The unique conditions presented by Lake Vostok may also offer an outlook on life to be expected in extra-terrestrial subglacial environments, such as on Jupiter's moon Europa or Saturn's moon Enceladus.
机译：大约400个底层湖泊是从南极洲众所周知的。自发现以来，底杉湖的生活是否具有普遍的问题。尽管频繁地证明了主要来自吸收冰的微生物寿命，但由于我们所知，底杉湖的特征是生理敌对的环境。纯净水（盐度<= 0.4-1.2％），极端寒冷（-3℃），高静水压力，有限的区域或无氧可用性和永久性的黑暗，完全需要生理适应这些恶劣条件。基因序列的记录，包括与水热通风口相关的一些相关的培养沃斯托克湖中的美化生活的想法。在这里，我们综合了围绕亚冰川湖泊的物理化学环境，水热活动的潜在部位，并倡导这些位点的物理化学稳定性可能是所存在的凡氮丹生命的最有可能的网站。沃斯托克湖展出的独特条件还可以在陆地底污水环境中提供预期的展望，例如木星的月亮欧罗巴或土星月球Enceladus。

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