Krill discovered living in the antarctic abyss
(NC&T/BAS) Reporting in the journal Current Biology, scientists from British Antarctic Survey (BAS) and the National Oceanography Centre, Southampton (NOCS) describe how they used a deep-diving, remotely operated vehicle (RoV) known as the Isis to film previously unknown behaviour of krill.
Professor Andrew Clarke of the British Antarctic Survey said,
"While most krill make their living in the ocean's surface waters, the new findings revise significantly our understanding of the depth distribution and ecology of Antarctic krill. It was a surprise to observe actively-feeding adult krill, including females that were apparently ready to spawn, close to the seabed in deep water."
Scientists have been studying krill since the 'Discovery' expeditions of the early 20th century. Oceanographic expeditions, using a combination of echo-sound techniques and collection samples in nets, indicated that the bulk of the population of adult krill is typically confined to the top 150 metres of the water column.
The grant to purchase the Isis RoV was led by Professor Paul A Tyler of NOCS. He says,
|Female antarctic krill. (Photo: BAS)|
The discovery holds some important lessons, Clarke continued.
"The behaviour of marine organisms - even quite 'primitive' ones - can be complex and more varied than we usually assume. There is still a great deal to learn about the deep sea and an important role for exploration in our attempts to understand the world we live in."
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