JR157: Seabed biology of Marguerite Bay, Antarctica


Cruise Diary

Date: Friday 26 January 2007
Position: 65o44.6’ S, 73o01.1’ W, Marguerite Bay

Chris writes:

"An Isis eye view of Marguerite Bay…

Isis is just about to complete her seventh dive here in Marguerite Bay. She has spent today at approximately 3500 m exploring the geological features and biology of the abyssal plain. Tonight we move back onto the continental shelf to continue our survey in shallower waters.

In the first six dives Isis has spent a total of 84 hours in the water and 66 hours on the sea bed. We have been recording from two digital video cameras on each dive which have so far produced about 150 hours of video to analyze. Isis has also generated almost 58 gigabytes of navigational data. Using the digital still camera we have taken approximately 800 photographs over these dives. These images will need some processing and analysis before they are of any use. We also have 1843 ‘frame grabs’. A frame grab is a still image taken from a video recording. As a taste of what we have found in Marguerite Bay I enclose with this entry a number of the more interesting of these..."

Seafloor at 850 m with a glacial drop stone covered in epifanua

Starfish on another glacial drop stone

Brisingid starfish

The sea cucumber (holothurian) Elpidia

Isis collecting sea pens

Drop stone with glass sponge

Rat tail fish investigating Isis up close

Dumbo octopus at 850 m in Marguerite Bay

Isis using a push core to sample the sediment at 3500 m

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