Fri, Mar 02, 2018 - Page 5 News List

FEATURE: Researchers find worry, hope in Antarctica work

AFP, KING GEORGE ISLAND, Antarctica

Scientist Marisol Pizarro takes the temperature of the soil on Feb. 2 in an open-top chamber on King George Island, Antarctica, where she studies how Antarctic mosses tolerate global warming.

Photo: AFP

A decade ago, a thick layer of ice covered the Collins Glacier on Antarctica’s King George Island.

Now, the rocky landscape is visible to the naked eye, in a region that is both a victim of and a laboratory for climate change.

“I had the opportunity to come here over a 15-year period, and even within a human’s lifetime, you can already see the changes brought about by climate change,” Chilean Antarctic Institute (INACH) director Marcelo Leppe told reporters.

Observers can now see “rocks that we weren’t seeing five or 10 years ago, and that is direct evidence of the shrinking of these glaciers and loss of mass,” he said.

However, even as these melting glaciers worry the scientific world, the presence in Antarctica of plants proving resistant to extreme conditions has also sparked hope for a warming planet.

Chile is one of about 20 countries with scientific bases on the cold continent. Its Professor Julio Escudero complex on King George Island is where dozens of researchers are measuring the effects of climate change on native flora and fauna.

“We need to quantify the change to predict what could happen in the near future,” Leppe said.

Measurements taken last year by Chilean scientists on Doumer Island in Antarctica’s Palmer Archipelago showed that water temperature had risen to 2.5°C, up from its normal range of between 0°C and 1.5°C. And at a depth of 40 meters, it was still at 2°C.

The warming waters have attracted species previously unseen in the Antarctic, such as a spider crab normally found south of Chile. There is also a blooming of green algae, which is vital for the local ecosystem, especially for crustaceans.

“Even though they’re really small, the algae and the micro-algae are really important for balance in the food chain,” said Nelson Valdivia, a professor at Austral University of Chile. “They supply nutrients to the rest of the ecosystem, and we know that the number of species in the same ecosystem is a very important factor in terms of it remaining in good health.”

However, over a longer term, this flourishing of algae could unsettle the ecological balance.

The worry is “losing species that we don’t even yet know exist,” Valdivia said.

Scientists also fear the effect of warmer temperatures on the rest of the world.

According to NASA monitoring, between 2002 and 2016, Antarctica lost 125 gigatonnes of ice per year, causing sea levels worldwide to rise 0.35mm annually.

Antarctica holds 62 percent of the planet’s freshwater reserves, so the melting there could have far-reaching consequences, not least by diminishing the salinity of the seas, which could prove fatal for many marine species.

However, the white continent might also hold the key to plant and animal life adapting to changing temperatures.

Already, Antarctic plants — which are resistant to ultraviolet radiation and extreme conditions — are being used in biotechnology to give us sun protection lotion, antioxidants and natural sugars.

To survive the rigorous conditions, vegetation in Antarctica hoards sugar to survive the harsh winter months buried under the snow.

In some mini-greenhouses, Marisol Pizarro, a biotechnology researcher from the University of Santiago, studies how Antarctic plants react to temperatures artificially raised by 1°C or 2°C.

Her finding is that mosses survive the change quite well — an advantage that could serve other vegetation in the future.

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