Sail-World.com : Pictures reveal Antarctic marine life in area of rapid climate change
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Pictures reveal Antarctic marine life in area of rapid climate change |
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'Skate, Bathyraja sp. - Skates are rare in Antarctica. They live just above the seabed and have crushing mouthparts to eat shellfish and other animals living on the seabed. Most crushing predators became extinct in Antarctica when it cooled, but as it warms species such as this skate may become more common and have a big impact on the wide variety of native seabed life that have lived with few predators for millions of years.'
British Antarctic Survey ©
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New photographs of ice fish, octopus, sea pigs, giant sea spiders, rare rays and beautiful basket stars that live in Antarctica’s continental shelf seas are revealed this week by the British Antarctic Survey (BAS).
As part of an international study on sea surface to seabed biodiversity a research team from across Europe, USA, Australia and South Africa onboard the BAS Royal Research Ship James Clark Ross sampled a bizarre collection of marine creatures from the Bellingshausen Sea, West Antarctica – one of the fastest warming seas in the world.
Research cruise leader Dr. David Barnes of British Antarctic Survey said, 'Few people realise just how rich in biodiversity the Southern Ocean is – even a single trawl can reveal a fascinating array of weird and wonderful creatures as would be seen on a coral reef. These animals are potentially very good indicators of environmental change as many occur in the shallows, which are changing fast, but also in deeper water which will warm much less quickly. We can now begin to get a better understanding of how the ecosystem will adapt to change. Our research on species living in the waters surrounding the BAS Rothera Research Station on the Antarctic Peninsula shows that some species are incredibly sensitive to temperature changes. Our new studies on the diverse range of marine creatures living in the deep waters of the Bellingshausen Sea will help us build a more complete picture of Antarctica’s marine biodiversity and give us an important baseline against which we can compare future impact on marine life.'
BAS biologist Dr. Sophie Fielding studies krill — a small crustacean that is the main food for penguins, seals and whales. During the research cruise she found remarkable variations in species living within a relatively small area. She said, 'Changes at the Earth’s surface directly affect the surrounding ocean and the marine animals living there. For example accelerating glacier melt, collapse of ice shelves and shrinking winter sea-ice all seem to be impacting sea life. We want to understand that impact and what the implications for the food chain may be.'
Dr. Stefanie Kaiser is a German specialist on small seabed animals. She said, 'Although many of these animals are tiny, their behaviour helps us paint a much bigger picture in terms of how marine life may react to changes to the environment.'
 | Comb Jelly, Mnemiopsis sp. - Jellies like this can be very abundant in Southern Ocean surface waters and it is widely suggested that they will be amongst the big winners in a higher CO2 world. - British Antarctic Survey © |
Scientists used a diverse array of equipment to collect samples from the coast to the open ocean, which range in size from microscopic to giant.
BAS photographer Peter Bucktrout took stunning images of an astonishingly rich and unusual variety of life from on and above the deep continental shelf.
British Antarctic Survey (BAS), a component of the Natural Environment Research Council, delivers world-leading interdisciplinary research in the Polar Regions. Its skilled science and support staff based in Cambridge, Antarctica and the Arctic, work together to deliver research that underpins a productive economy and contributes to a sustainable world. Its numerous national and international collaborations, leadership role in Antarctic affairs and excellent infrastructure help ensure that the UK maintains a world leading position. BAS has over 450 staff and operates five research stations, two Royal Research Ships and five aircraft in and around Antarctica.
 | Isopod Crustacean, Serolid sp. - These animals (woodlice of the sea) appear as though they have been squashed and resemble fossil trilobites. This species is seen from above (left) and below (right) and is partly see-through. - British Antarctic Survey © |
 | Young Icefish, Chaenocephalus aceratus - These fish are highly adapted to life in cold water with anti-freeze, but no red blood cells, in their blood. - British Antarctic Survey © |
 | Unknown soft coral, awaiting identification by experts - The first the team has seen despite many cruises examining marine life in the region. - British Antarctic Survey © |
 | Isopod Crustacean, Antarcturus sp. - This group of animals (which woodlice on land belong to) are very rich in the Southern Ocean, particularly in deeper water. Antarcturus tend to hang off seaweed, sponges or (as here) sea fans to catch tiny plankton in the water. - British Antarctic Survey © |
 | Scale Worm, Laetmonice sp. - Polychaete worms like this are often the most abundant large organisms particularly on this continental shelf (the warmest at 1c20C around Antarctica). - British Antarctic Survey © |
 | Feather Star, Promachocrinus sp. - They are very mobile as both adults and larvae, eat phytoplankton (marine algae) and as such may track the changing patterns of marine algae [sea ice retreat and marine algae distribution are two of the strongest impacts of climate change measured in the region to date]. - British Antarctic Survey © |
 | Amphipod (sand hopper). - Gigantism (due to high oxygen levels in polar waters) was first demonstrated in amphipods and they are an important group that often take the role of animals such as crabs (which are virtually absent in Antarctica). - British Antarctic Survey © |
 | Sea Pig (sea cucumber or Holothuroid). - This was one of the most common and abundant animals in our catches. Sea cucumbers are important in processing the sediment (like earthworms on land) but their numbers worldwide have been threatened by recent fisheries. - British Antarctic Survey © |
 | Octopus (probably Pareledone sp.). - Octopus seemed to be particularly common in the study area and were found in most trawls. They seem to have undergone a major recent radiation centered in Antarctica. - British Antarctic Survey © |
 | Basket Star, Gorganocephalus sp. - This beautiful brittle star was filmed expanding its curly, branching arms out over about a minute. It was found with its arms intertwined with an octocoral. Posed here, it is able to filter feed on food floating by in the water above the seabed - British Antarctic Survey © |
http://www.antarctica.ac.uk/
by British Antarctic Survey Share
11:54 PM Sat 19 Dec 2009 GMT
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