听
Water connects it all.
For millions of years, Antarctica鈥檚 tiny life forms have claimed isolated pockets for their homes. Watery holes in a glacier. Patches of soil. Rocks on a streambed.
Each separate niche holds a different mix of species. All survive on water trickling off the nearby glaciers.
As the climate warms, more melt water will pour off the glaciers, sweeping through these pockets of life. Scientists believe the organisms鈥攁nd the stuff that nurtures them鈥攚ould spread out over the landscape. Variations between the many, specialized ecosystems would disappear. The planet might lose some species that live only in Antarctica.
听
Glaciers
At the edges of the Dry Valleys, glaciers release water into the landscape when they melt a little each summer. They also harbor miniscule communities in water-filled holes, like buried terrariums.
Taylor Glacier entering the Taylor Valley. (Peter Rejcek / NSF)
Soils
In summer, water seeps into the ground, especially around streambeds. That鈥檚 enough to support microscopic, worm-like animals called nematodes.
Wright Valley in the McMurdo Dry Valleys. (Collin Harris / Era Images)
Streams
Water moves through these channels for only one or two months each year, on average. Even during that time, the flow isn鈥檛 constant. Living things on rocks and streambeds have adapted to survive the dry spells.
Onyx River in the Wright Valley. (Nate Biletnikoff / NSF)
Lakes
Permanently covered in ice, lakes are the only places on the continent where water stays liquid throughout the year. They harbor more kinds of life than anywhere else. In summer, inhabitants from other places float down streams into the lakes.
Blue ice covering Lake Fryxell. (Joe Mastroianni / NSF)