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The ROPOS camera provides a glimpse of the sea bottom of the Northeast Channel, replete with听corals, anemones and sponges. |
Ever notice that those little blue kitchen scrubbers, like socks in the dryer, always seem to go missing?
Which makes it all the more remarkable that scientific researchers aboard the Coast Guard ship Hudson were able to find them four years after placing them on the ocean bottom in the 424-square-kilometre Coral Conservation Area in the Northeast Channel.
They鈥檙e used as part of 鈥渓arval settlement collectors,鈥� designed to see what organisms are attaching and surviving on the ocean floor after the area was closed to fishing in 2002.
The area, about 100 nautical miles off southwestern Nova Scotia, is home to up to 35 species of deep-water coral, such as bubblegum coral and seacorn coral. Prior to the area being closed, one could find broken and tilted corals and scattered skeletons 鈥� signs of fishing impacts on the long-lived corals.
鈥淭his area was fished heavily,鈥� explains Anna Metaxas, professor with Dalhousie鈥檚 Department of Oceanography, on shore in Shelburne, N.S. where the Hudson was having a crew change. 鈥淲e were concerned about corals recruiting into the area. Habitat that is suitable for the tree-like deep water corals is rare. Plus, they鈥檙e so beautiful -- in pink, orange, white, red and yellow. You can鈥檛 believe how incredible it is 600, 800 metres below the surface.鈥�
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| This photo from Jordan Basin shows a red fish, large and small anemones and sponges. |
The Hudson is equipped with a ROPOS (remotely operated deep water submersible), a Volkswagen-sized underwater robot equipped with GPS, high-definition video and digital听cameras and two robotic arms which allow it to take samples. The sophisticated equipment was able to re-locate the larval settlement collectors to within a metre of where they were placed in 2006 and retrieve them.
鈥淭hose blue scrubbers are full of little holes that organisms like to hide in ... It was very exciting to see them again,鈥� says Dr. Metaxas, her voice animated. As a benthic ecologist, she鈥檚 interested in the factors that regulate populations of marine invertebrates, particularly in their early life stages. 鈥淭hey were absolutely full of things. You can see baby corals, scallops, brittle stars, anemones...鈥�
The scientific expedition, with 28 science staff, 6 ROPOS crew and 33 Canadian Coast Guard crew aboard, left the Bedford Institute of Oceanography in Dartmouth on July 29 and is expected back August 11. The two-week cruise is part of a collaborative NSERC project called the Canadian Healthy Oceans Network (CHONe) and includes students, geologists, and oceanographers from Dalhousie, University of Victoria, Memorial University of Newfoundland, Laval, as well as their collaborators from Fisheries and Oceans Canada. Among the 黑料吃瓜网contingent is Dr. Metaxas, MSc student Myriam Lacharite and NSERC USRA Jessie Short.
Besides the Northeast Channel, the cruise investigated four other study areas at depths up to 3,000 metres: Jordan Basin, German Bank and Northeast Fan. As well, seabird and marine mammal surveys took place from the bridge during daylight hours.
鈥淔or me, it鈥檚 really neat to watch the students,鈥� says Dr. Metaxas. 鈥淭he deep sea is a pretty special place and one does not expect it to be so because it鈥檚 so dark and remote. So when you can see what鈥檚 here, well, it鈥檚 pretty amazing.鈥�
LINKS: Blog from the Hudson,听听|