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Understanding global climate change through new breakthroughs in polar research
Date:2/18/2010

The latest findings from research on Antarctica's rich marine life are presented this week at the American Association for the Advancement of Science (AAAS). Marine Biologist Huw Griffiths from British Antarctic Survey (BAS) is involved in a major international investigation into the distribution and abundance of Antarctica's vast marine biodiversity the Census of Antarctic Marine Life (CAML).

Griffiths presents results from the census which began in 2005 and describes how the investigation provides the benchmark for future studies on how the extraordinary and diverse range of sea-floor creatures living in Antarctica's chilly waters will respond to predicted environmental change.

More than 6,000 different species living on the sea-floor have been identified so far and more than half of these are unique to the icy continent. A combination of long-term monitoring studies, newly gathered information on the marine life distribution and global ocean warming models, enable the scientists to identify Antarctica's marine 'biodiversity hotspots'.

Griffiths describes how krill populations (the shrimp-like invertebrates eaten by penguins, whales and seals) are reducing as a result of a decrease in sea-ice cover. A much smaller crustacean (copepods) is dominating the area once occupied by them. This shifts the balance of the food web to favour predators, like jellyfish, that are not eaten by penguins and other Southern Ocean higher predators. Sea-ice reduction is also affecting penguins that breed on the ice.

Griffiths says, "The Polar Regions are amongst the fastest warming places on Earth and predictions suggest that in the future we'll see warming sea surface temperatures, rising ocean acidification and decreasing winter sea ice - all of which have a direct effect on marine life.

"Marine animals spent millions of years adapting to the freezing, stable conditions of the Antarctic waters and they are highly sensitive
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Contact: Heather Martin
hert@bas.ac.uk
44-122-322-1414
British Antarctic Survey
Source:Eurekalert

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