Distribution of hydrocorals along the George V Slope, East Antarctica

Post, Alexandra L., O'Brien, Philip E., Beaman, Robin J., Riddle, Martin J., De Santis, Laura, and Rintoul, Stephen R. (2012) Distribution of hydrocorals along the George V Slope, East Antarctica. In: Harris, Peter T., and Baker, Elaine K., (eds.) Seafloor Geomorphology as Benthic Habitat: GeoHab atlas of seafloor geomorphic features and benthic habitats. Elsevier, London, England, pp. 717-726.

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Abstract

Dense coral–sponge communities on the upper continental slope (570–950 m) off George V Land, east Antarctica, have been identified as Vulnerable Marine Ecosystems. We propose three main factors governing their distribution on this margin: (i) their depth in relation to iceberg scouring, (ii) the flow of organic-rich bottom waters, and (iii) their location at the head of shelf-cutting canyons. Icebergs scour to depths of 500m in this region, and the lack of such disturbance is a likely factor allowing the growth of rich benthic ecosystems. In addition, the richest communities are found in the heads of canyons that receive descending plumes of Antarctic bottom water formed on the George V shelf, which could entrain abundant food for the benthos. The canyons harboring rich benthos are also those that cut the shelf break. Such canyons are known sites of high productivity in other areas due to strong current flow and increased mixing with shelf waters, and the abrupt, complex topography.

Item ID: 19344
Item Type: Book Chapter (Research - B1)
Keywords: hydrocorals, Vulnerable Marine Ecosystem, submarine canyons, continental slope, oceanographic processes
ISBN: 978-0-12-385140-6
Date Deposited: 22 Dec 2011 05:00
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040305 Marine Geoscience @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960801 Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity @ 100%
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