南极冰下湖钻探揭示了极端隔离中的生命奥秘
Beneath the East Antarctic Ice Sheet, a hidden realm slumbers in perpetual darkness and crushing pressure. Scientists using hot-water drills have recently breached more than half a mile of ice to access Lake Whillans, a subglacial body of water sealed from the atmosphere for perhaps hundreds of thousands of years. The logistics are staggering: a convoy of tractors hauling a 400-tonne drilling rig across crevassed ice plains, working in temperatures that plummet below -40°C, all to sample a liquid world that no human has ever seen.
The scientific prize, however, justifies the ordeal. Subglacial lakes like Whillans are not mere curiosities; they are time capsules of microbial evolution under extreme isolation. When the drilling team finally retrieved water and sediment samples, they discovered thriving communities of chemosynthetic bacteria that derive energy not from sunlight, but from the chemical reduction of iron and sulfur compounds in the bedrock. These microbes have adapted to a near-zero-energy environment, metabolising at rates so slow that a single cell might divide only once every few years.
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