A New Insight On Antarctica’s Blood Falls

Why in News?

A new study published in Nature Geoscience has revealed evidence of a diverse community of microorganisms living around the ancient hypersaline brine system beneath Taylor Glacier in Antarctica, the source of the famous Blood Falls.

The study was led by microbiologist Angela Zoumplis of the University of California, San Diego.

What is Blood Falls?

Blood Falls is a striking vermilion-red waterfall flowing from Taylor Glacier into Lake Bonney in Antarctica.

• The phenomenon was first observed by Australian geologist Thomas Griffith Taylor during an expedition in 1911.
• Scientists initially believed that the red colour was caused by algae.
• Later research established that the colour comes from iron-rich, hypersaline water emerging from beneath the glacier.

Why is the Water Red?

• An ancient reservoir of hypersaline brine is trapped beneath Taylor Glacier.
• The brine is believed to have originated from ancient seawater that became sealed beneath the advancing glacier.
• It has remained isolated for at least 1.5 million years.
• Because the brine has a high salt concentration, its freezing point is lower than that of ordinary water, allowing it to remain liquid beneath the glacier.
• The brine contains large amounts of dissolved iron.
• While trapped beneath the ice, the iron remains largely unseen.
• When the brine reaches the surface and comes into contact with oxygen, the iron rapidly oxidises, producing iron oxides that give the water its characteristic deep rusty-red colour.

Ancient Microbial Ecosystem

The new research suggests that the isolated brine system supports a rich community of microorganisms.

These organisms may be descendants of a marine microbial community that became isolated beneath the glacier millions of years ago.

The discovery provides an opportunity to study how life can survive for extremely long periods in dark, cold, highly saline and isolated environments.

 Earlier research on Blood Falls primarily focused on bacteria and archaea, collectively known as prokaryotes.

The new study places greater emphasis on eukaryotic microorganisms, which possess:

• A membrane-bound nucleus
• Complex internal cellular structures
• More advanced cellular organisation than prokaryotes

Eukaryotes include organisms ranging from single-celled amoebae and protists to plants and animals. 

Researchers are particularly interested in diatoms, microscopic photosynthetic protists commonly found in marine and freshwater environments.

Their presence can provide valuable information about:

• The ancient environmental conditions of the brine system.
• The possible marine origin of the microbial community.
• How microorganisms adapted to prolonged isolation and extreme conditions.

Source: Science Alert

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