南极洲的生物多样性远超预期

In a comprehensive assessment of Antarctic biodiversity, published in Nature this week, scientists have revealed the region is more diverse and biologically interesting than previously thought. The team of scientists, led by Monash University, along with colleagues from the British Antarctic Survey, University of Waikato in New Zealand, and Australian National University, looked at how recent investigations have revealed the continent and surrounding ocean is rich in species. They are also very highly diversified into a variety of distinct ecological regions that differ greatly from each other.

Lead author, Professor Steven Chown, School of Biological Sciences at Monash, said the team explicitly focussed on demonstrating the diversity of various areas of the Antarctic continent and Southern Ocean.

"Most people think of the continent as a vast, icy waste, and the sea as uniformly populated by whales, seals and penguins. But that's simply not true," he said.

"There's much biodiversity on land, especially among the micro-organisms, such as bacteria, and the seafloor is very rich in larger unusual species, such as sea spiders and isopods (the marine equivalents of slaters or wood lice). More than 8000 species are known from the marine environment."

Dr Ceridwen Fraser, co-author from the Australian National University said: "Each area of the Antarctic also has very different groupings of species; while initially they may look the same, they are actually very different."

The team also noted several unusual ways in which patterns of biodiversity are produced in the region. Geothermal, heated areas, such as volcanoes, have played an important role as refuges from icy, glacial conditions on land. At sea, wind has an especially significant effect on diversity. Windier areas have more seabird species.

Professor Chown said: "Increasing wind speeds, associated with the ozone hole, have, quite unusually, improved conditions for wandering albatrosses, reducing their travel time and enabling them to become much heavier as adults."

Professor Craig Cary, co-author from the University of Waikato, New Zealand, added: "Antarctica and the Southern Ocean have much more biodiversity, structured in more interesting ways than ever previously thought. Sub-glacial micro-organismal life provides an excellent example of a surprising recent discovery."