About 800 metres beneath the West Antarctic ice sheet, researchers found a thriving microbial community in Subglacial Lake Whillans. The best-supported headline figure is not 2,800 species: a 2014 study reported more than 3,900 different types of bacteria and archaea in DNA sequence data. Those are sequence-based types, not thousands of formally named species or animals visible to the eye.
What was found beneath the ice?
Subglacial Lake Whillans lies beneath the Whillans Ice Stream in West Antarctica, under approximately 800 metres of ice. It is an aquatic habitat beneath the glacier, not a population living inside solid ice. In 2014, researchers reported a rich community of bacteria and archaea in water and sediment sampled from the lake. The Nature study described more than 3,900 different types identified through sequencing.
That wording matters. DNA sequencing detects genetic variation in collected material; it does not mean scientists counted 3,900 organisms, watched that many kinds of life, or formally described 3,900 species. NASA Astrobiology quotes researcher John Priscu saying, “There are about 4,000 species, according to our DNA sequence data.” That is a rounded description of the sequence results; the primary paper reports more than 3,900 different types of bacteria and archaea.
How did researchers reach a lake sealed beneath the glacier?
The lake was sampled in January 2013. Reaching it without introducing microbes from the surface or drilling equipment was essential: contamination could make it difficult to tell whether detected organisms came from the lake or the access route.
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- Researchers used a microbiologically clean hot-water drill to bore through the ice.
- They collected samples from the lake after reaching the subglacial water and sediment.
- They compared samples from the drilling system with lake samples to assess the risk that the equipment had introduced organisms.
A later analysis found that the lake community was distinct in composition from assemblages in the drilling system and was dominated by bacteria. This comparison supports the interpretation that the lake samples contained a resident community rather than simply reflecting the drilling apparatus. The 2016 community analysis describes the sampling and comparison.
How can anything live without sunlight?
The lake is permanently dark beneath the ice, so its microbial ecosystem cannot rely on sunlight in the way plants and surface food webs do. Instead, the evidence supports a community that obtains energy through chemical reactions. Research describes pathways involving compounds of iron, sulfur and nitrogen. Microbes can use such reactions to power metabolism, even where photosynthesis is impossible.
A 2021 experimental study proposed an additional way energy-bearing chemicals may become available: subglacial erosion can freshly abrade mineral surfaces, and reactions at those surfaces may release chemical species that augment microbial energy supplies. This is a proposed contributing mechanism, not proof that abrasion is the sole energy source. The 2021 study examines this possibility.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does the discovery tell us?
Lake Whillans shows that liquid water beneath a glacier can host a diverse microbial ecosystem despite prolonged darkness. It also illustrates why evidence from remote environments needs careful interpretation: the reported diversity comes from DNA sequence types, and contamination controls help establish that the sampled community belongs to the lake.
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These findings help scientists understand how life can persist in extreme environments on Earth. They do not establish that life exists elsewhere, but they offer a well-studied example of an ecosystem that can function without sunlight by using chemical energy.
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