Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses
Maintenance and Update Frequency: unknown Statement: Unknown Dense coral-sponge communities on the upper continental slope off George V Land have been identified as a Vulnerable Marine Ecosystem in the Antarctic. The challenge is now to understand their likely distribution. The CEAMARC survey found...
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ftands:oai:ands.org.au::682816 2024-09-15T17:45:51+00:00 Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses APOST (custodian) Beaman, R.J. (author) Commonwealth of Australia (Geoscience Australia) (distributor) Commonwealth of Australia (Geoscience Australia) (owner) Commonwealth of Australia (Geoscience Australia) (pointOfContact) De Santis, L. (author) EGD (hasAssociationWith) Manager Client Services (custodian) O'Brien, P.E. (author) Post, A.L. (author) Riddle, M. (author) Spatial: westlimit=139.0; southlimit=-67.5; eastlimit=147.0; northlimit=-65.0 https://researchdata.edu.au/physical-controls-coral-working-hypotheses/682816 https://pid.geoscience.gov.au/dataset/ga/69269 unknown Australian Ocean Data Network https://researchdata.edu.au/physical-controls-coral-working-hypotheses/682816 a05f7892-eca8-7506-e044-00144fdd4fa6 https://pid.geoscience.gov.au/dataset/ga/69269 EGD Commonwealth of Australia (Geoscience Australia) geoscientificInformation External Publication Report geomorphology abiotic surrogates Antarctic data marine AQ EARTH SCIENCES Published_External publication ftands 2024-08-06T01:59:00Z Maintenance and Update Frequency: unknown Statement: Unknown Dense coral-sponge communities on the upper continental slope off George V Land have been identified as a Vulnerable Marine Ecosystem in the Antarctic. The challenge is now to understand their likely distribution. The CEAMARC survey found these communities at sites on the upper slope in depths of 570 - 950m. Based on these results we propose some working hypotheses defining the physical settings suitable for such assemblages. Icebergs scour to 500m 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. We suggest two possible oceanographic mechanisms linking 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. Maps of water properties measured during the Collaborative East Antarctic Marine Census (CEAMARC) survey provide some support for this idea. 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, 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. Text Antarc* Antarctic George V Land Iceberg* Research Data Australia (Australian National Data Service - ANDS) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
geoscientificInformation External Publication Report geomorphology abiotic surrogates Antarctic data marine AQ EARTH SCIENCES Published_External |
spellingShingle |
geoscientificInformation External Publication Report geomorphology abiotic surrogates Antarctic data marine AQ EARTH SCIENCES Published_External Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses |
topic_facet |
geoscientificInformation External Publication Report geomorphology abiotic surrogates Antarctic data marine AQ EARTH SCIENCES Published_External |
description |
Maintenance and Update Frequency: unknown Statement: Unknown Dense coral-sponge communities on the upper continental slope off George V Land have been identified as a Vulnerable Marine Ecosystem in the Antarctic. The challenge is now to understand their likely distribution. The CEAMARC survey found these communities at sites on the upper slope in depths of 570 - 950m. Based on these results we propose some working hypotheses defining the physical settings suitable for such assemblages. Icebergs scour to 500m 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. We suggest two possible oceanographic mechanisms linking 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. Maps of water properties measured during the Collaborative East Antarctic Marine Census (CEAMARC) survey provide some support for this idea. 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, 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. |
author2 |
APOST (custodian) Beaman, R.J. (author) Commonwealth of Australia (Geoscience Australia) (distributor) Commonwealth of Australia (Geoscience Australia) (owner) Commonwealth of Australia (Geoscience Australia) (pointOfContact) De Santis, L. (author) EGD (hasAssociationWith) Manager Client Services (custodian) O'Brien, P.E. (author) Post, A.L. (author) Riddle, M. (author) |
format |
Text |
title |
Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses |
title_short |
Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses |
title_full |
Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses |
title_fullStr |
Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses |
title_full_unstemmed |
Physical Controls on Coral Communities on the George V Land Slope: Some Working Hypotheses |
title_sort |
physical controls on coral communities on the george v land slope: some working hypotheses |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/physical-controls-coral-working-hypotheses/682816 https://pid.geoscience.gov.au/dataset/ga/69269 |
op_coverage |
Spatial: westlimit=139.0; southlimit=-67.5; eastlimit=147.0; northlimit=-65.0 |
genre |
Antarc* Antarctic George V Land Iceberg* |
genre_facet |
Antarc* Antarctic George V Land Iceberg* |
op_source |
EGD Commonwealth of Australia (Geoscience Australia) |
op_relation |
https://researchdata.edu.au/physical-controls-coral-working-hypotheses/682816 a05f7892-eca8-7506-e044-00144fdd4fa6 https://pid.geoscience.gov.au/dataset/ga/69269 |
_version_ |
1810493774797733888 |