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ROV Discovers Antarctic Seafloor Fauna
Bremerhaven, Germany (SPX) Jan 22, 2007 Remotely Operated Vehicles (ROV) remain an efficient technology to uncover the secrets of Antarctic seafloor fauna. As a precursor to the International Polar Year 2007/2008, the current Polarstern expedition conducted by the Alfred Wegener Institute for Polar and Marine research releases short seafloor video clips taken by ROV only a few hours after the robot has been recovered. ROVs have become the standard non-invasive imaging tool for biologists from the Alfred Wegener Institute. For the current expedition, devoted to the study of continental shelf seafloor communities, which were once under the recently collapsed Larsen B ice-shelf, the ROV model Cherokee was selected. "Inspection ROVs like the Cherokee are fast to deploy and easy to recover" explains the chief scientist and marine ecologist Julian Gutt, who can draw upon 15 years of experience investigating Antarctica's seafloor fauna using ROVs. Already used on a previous expedition, the ROV carries one still and three video cameras, including one high-resolution, as well as a manipulator enabling the collection of specimens. Werner Dimmler, one of Europe's most experienced ROV pilots states: "It can dive down to 1000 meter depth, which is enough for the Larsen B ice-shelf area." The first ROV footage, in relatively deep water, revealed an unusual environment characterized by pebble fields and rocks that have been scoured by ice over thousands of years. Delicate pink hydrocorals and various echinoderms were particularly conspicuous. Recently ice-scoured areas of the seafloor were completely devoid of life. This expedition follows an integrated approach to obtain data from as many components of the Antarctic ecosystem as possible. Physical parameters of the water column as well as the seafloor are measured. The range of investigated organisms spans creatures as small as microorganisms, medium-sized invertebrates and fish, to the biggest of all animals, the whales. "During the subsequent weeks researchers will try to answer the following question: What kind of biodiversity change do we expect after the collapse of the Larsen A/B ice-shelf, will an originally impoverished fauna flourish, or will species go extinct? " said Julian Gutt. Related Links Alfred Wegener Institute for Polar and Marine Research Water, Water Everywhere and Not A Drop To Drink... Water News - Science, Technology and Politics
Vietnam Dam Project Dooms Remote Mountain Town
Muong Lay, Vietnam (AFP) Jan 15, 2007Over the past 15 years, this remote town has lost its original name and half its people. Those left behind know what awaits their homes: submersion beneath Vietnam's largest dam. By 2010, Muong Lay will be at the bottom of the giant reservoir of a hydropower project to fuel economic growth in cities and industrial parks far away from this northwestern region, one of the country's poorest. |
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