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Physical Controls on Deep Water Coral Communities on the George V Land Slope, East Antarctica

Created 17/10/2025

Updated 17/10/2025

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Dense coral-sponge communities on the upper continental slope at 570 - 950 m off George V Land have been identified as a Vulnerable Marine Ecosystem in the Antarctic. The challenge is now to understand their likely distribution. Based on results from the Collaborative East Antarctic Marine Census survey of 2007/2008, we propose some hypotheses to explain their distribution. Icebergs scour to 500 m in this region and the lack of such disturbance is probably a factor allowing growth of rich benthic ecosystems. In addition, the richest communities are found in the heads of canyons. Two possible oceanographic mechanisms may link abundant filter feeder communities and canyon heads. The canyons in which they occur receive descending plumes of Antarctic Bottom Water formed on the George V shelf and these water masses could entrain abundant food for the benthos. Another possibility is that the canyons harbouring rich benthos are those that cut the shelf break. Such canyons are known sites of high productivity in other areas because of a number of oceanographic factors, including strong current flow and increased mixing with shelf waters, and the abrupt, complex topography. These hypotheses provide a framework for the identification of areas where there is a higher likelihood of encountering these Vulnerable Marine Ecosystems.

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Field Value
Title Physical Controls on Deep Water Coral Communities on the George V Land Slope, East Antarctica
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/b2f4faf3-7c26-432a-abd8-e149b3ad4994
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        139.0,
        -67.5
      ],
      [
        147.0,
        -67.5
      ],
      [
        147.0,
        -65.0
      ],
      [
        139.0,
        -65.0
      ],
      [
        139.0,
        -67.5
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Physical Controls on Deep Water Coral Communities on the George V Land Slope, East Antarctica". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/physical-controls-on-deep-water-coral-communities-on-the-george-v-land-slope-east-antarctica