| Amundsen |
The productive shelf and polynyas of the Amundsen and Bellingshausen seas. The oceanic shallow environments of Peter I Island, De Gerlache Seamounts and the Marie Byrd Seamount group. |
| Antarctic Peninsula |
The shallow, productive shelf of the west Antarctic Peninsula with a low duration of sea ice cover and warm seabeds relative to other Antarctic shelf areas. The island ecosystems of the South Shetland Islands. 13 endemic molluscs [11]. Greater than 10% of gastropods endemic [12]. |
| Atlantic Basin |
The very deep and very cold rugose ocean floor and abyssal plain of the South Atlantic Ocean Basin and Weddell Sea. |
| Central Indian-East Kerguelen Subregion |
Central Indian region of East Antarctica that is influenced by the Kerguelen Plateau including downstream productivity from frontal activity across the Kerguelen Plateau [17]. |
| Central Indian-Prydz Bay Subregion |
Central Indian region of East Antarctica that contains the cold, productive waters of Prydz Bay and the Prydz Gyre which oceanographically separates the east Kerguelen and west Kerguelen Central Indian subregions [17]. |
| Central Indian-West Kerguelen Subregion |
Central Indian region of East Antarctica that is not influenced by the Kerguelen Plateau nor the Weddell Gyre [17]. |
| Central Indian -Wilkes Subregion |
Central Indian region of East Antarctica that is oceanographically separated from the Central Indian-East Kerguelen subregion [17], [140]. |
| Del Cano |
The shallow, warm seabeds in the Subantarctic Frontal Zone including the South West Indian Ridge seamounts, the Del Cano Rise and the Crozet and Prince Edward Islands. |
| Dronning Maud |
Maud Rise and associated open ocean polynya, Astrid Ridge, Gunnerus Ridge and the canyons offshore Dronning Maud Land. Easternmost extent of the Weddell Gyre. 20 endemic molluscs (19% of documented species) [11]. 21% of documented gastropods are endemic [12]. |
| East Indian Abyssal |
The very deep and cold seabeds of the rugose ocean floor and abyssal plains of the South Indian Ocean Basin. |
| Kerguelen-Banzare Bank Subregion |
Shallower (mostly depths between 1000 to 3000 m), warmer seabeds of the Banzare Bank, south of the frontal activity of the Fawn Trough. |
| Kerguelen-Deep Kerguelen Subregion |
Deep (mostly depths greater than 3000 m) ocean surrounding the Kerguelen Plateau and Banzare Bank. |
| Kerguelen-Kerguelen Plateau Subregion |
Shallower (mostly depths between 200 m to 3000 m), warmer seabeds of the Kerguelen Plateau, north of the frontal activity of the Fawn Trough. |
| Oates |
Oceanographically separated from the Central Indian-Wilkes subregion with wind and sea ice vectors diverging at its western border [17]. The eastern border is adjacent to the Ross Sea region [2], [33], [125]. |
| Ob & Lena |
Shallow, warm seabeds in the Polar Frontal Zone, including the Ob and Lena banks and the seamounts to their east. |
| Pacific Basin |
The very deep rugose ocean floor and abyssal plains of the South Pacific Ocean Basin which is warmer than other deep ocean basin regions of the Southern Ocean. |
| Pacific-Antarctic Ridge |
The Pacific-Antarctic Ridge region with large extents of shallower environments of depths less than 2000 m. |
| Ross Sea |
Very cold seabed and high sea ice duration of the productive Ross Sea. 22 endemic molluscs (11.5% of documented species) [11]. 16% of documented gastropods endemic [12]. |
| South Atlantic |
Shallower environments of the Mid Atlantic Ridge and associated seamounts. |
| South Georgia |
Productive, shallow environments in the Polar Frontal Zone including the island ecosystems of South Georgia Island and the seamounts of the North Scotia Ridge. 65 endemic molluscs (32.7% of documented species) [11]. 15% of documented Cheilostomata endemic [12]. 13% of documented bivalves endemic [12]. 36% of documented gastropods endemic [12]. |
| South Orkney Islands |
The island ecosystems of the South Orkney Islands and the seamounts and plateaus of the South Scotia Arc, many of which underlie the Southern Antarctic Circumpolar Current Frontal Zone. 22 endemic molluscs (19.6% of documented species) [11]. 25% of documented gastropods endemic [12]
|
| South Sandwich Islands |
Highly productive island ecosystems of the South Sandwich Islands and the deeper waters of the South Sandwich Trench. |
| Weddell Shelf |
Very cold seabed and high sea ice duration of the productive Weddell shelf, usually rather deep, ∼500 m, at places even down to 1000 m. 55 endemic molluscs (19.7% of documented species) [11]. 26% of documented gastropods endemic [12]
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