Defining species

763 Vostok, and are located relatively close to it (Bell et al, 2006). “The size and origin of the two recently discovered large subglacial lakes suggest that these lakes are tectonically controlled. In contrast to the smaller and shallower lakes, tectonically controlled subglacial lakes are deep and quite old,” said Studinger. “The tectonic control and longevity of these lakes suggests that they probably host a diverse ecosystem.” The idea that subglacial lakes are interconnected by a hydrological network beneath the ice has existed for some time, but evidence to prove it was not available until now, Studinger added. He noted that the work by Duncan Wingham and others showed that these linkages exist, and that the flux of water beneath large continental ice sheets can be relatively fast and voluminous. “Model predictions of future sea-level rise have to take into account the lubricating effects of subglacial water on ice sheet stability and drainage, and the possible influx of large volumes of fresh water into the ocean,” said Studinger.