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| South Orkney Islands Southern Shelf MPA | |
|---|---|
| Name | South Orkney Islands Southern Shelf MPA |
| Location | Southern Ocean |
| Established | 2009 |
| Area | 94,000 km2 |
| Governing body | Commission for the Conservation of Antarctic Marine Living Resources |
| Coordinates | 60°45′S 45°30′W |
| Designation | Marine Protected Area |
South Orkney Islands Southern Shelf MPA is a large marine protected area designated to conserve Southern Ocean marine life around the South Orkney Islands and adjacent continental shelf. The MPA was established by the Commission for the Conservation of Antarctic Marine Living Resources to protect benthic communities, top predators, and krill-dependent food webs in waters influenced by the Antarctic Circumpolar Current, Weddell Sea outflow, and regional ice dynamics. It forms part of a network of Antarctic protections alongside areas such as the Ross Sea Marine Protected Area and complements measures under the Antarctic Treaty System and the Convention on the Conservation of Antarctic Marine Living Resources.
The MPA encompasses shelf and slope habitats south of the South Orkney Islands intended to safeguard populations of Antarctic krill, Patagonian toothfish, minke whale, emperor penguin, and benthic invertebrates including Antarctic sponge assemblages and seamount-associated fauna. It was proposed and negotiated through meetings of the CCAMLR Scientific Committee, with input from national delegations such as United Kingdom Antarctic Heritage Trust advisors, Argentina and Chile researchers, and expert bodies including the Scientific Committee on Antarctic Research. The designation reflects commitments under the 1991 Protocol on Environmental Protection to the Antarctic Treaty and aligns with biodiversity targets set by the Convention on Biological Diversity.
The MPA covers a sector of the Southern Ocean around the southerly slope of the South Orkney Islands and extends across the continental shelf and upper slope to specified latitudinal and longitudinal limits negotiated at CCAMLR annual meetings. Boundaries are defined relative to maritime features such as the South Orkney Plateau, local bathymetric contours, and connections to adjacent management areas near the Weddell Sea and Scotia Sea. Neighboring jurisdictions and frameworks include the Antarctic Treaty Consultative Meeting, British Antarctic Survey operational zones, and Argentine base locations in the archipelago.
The protected area supports a food web centered on seasonal blooms of phytoplankton and dense aggregations of Euphausia superba (Antarctic krill) that sustain higher trophic levels such as Antarctic fur seal, southern elephant seal, Adélie penguin, and migratory humpback whale. Benthic habitats include extensive sessile invertebrate communities with sponges, soft corals, bryozoans, and echinoderms documented by surveys from platforms like RRS James Clark Ross and RV Polarstern. The area’s productivity is modulated by currents including the Antarctic Circumpolar Current and Bransfield Strait exchanges, and by sea-ice influenced by the Southern Annular Mode. Genetic studies and species inventories conducted by institutions like the British Antarctic Survey and Instituto Antártico Argentino have recorded endemic and circum-Antarctic taxa, with important links to global biodiversity datasets maintained by the Global Biodiversity Information Facility and research networks such as the Scientific Committee on Oceanic Research.
Primary objectives are to protect krill spawning and nursery grounds, conserve demersal fish and benthic communities, and maintain ecosystem structure and function to support predator populations documented by International Whaling Commission and seabird monitoring programs. Management measures include spatial closures for commercial fishing for Patagonian toothfish and limits on krill harvests coordinated through CCAMLR conservation measures, gear restrictions, and scientific observer requirements administered by national programs such as Commission for the Conservation of Antarctic Marine Living Resources contracting parties. Adaptive management frameworks draw on assessments by the CCAMLR Scientific Committee and integrate precautionary principles from the 1991 Protocol on Environmental Protection to the Antarctic Treaty.
The MPA was adopted following multi-year negotiations among CCAMLR members including Australia, Chile, European Union, Japan, Norway, Russia, United Kingdom, and United States. Its legal status is grounded in CCAMLR conservation measures and is implemented under the auspices of the Antarctic Treaty System, subject to the consensus-based decision-making procedures of CCAMLR. Historical exploration and scientific activity in the region trace to expeditions such as those by James Clark Ross and twentieth-century research by the UK Antarctic Survey and Instituto Antártico Argentino, which provided baseline ecological data informing the MPA proposal.
Ongoing research programs employ ship-based surveys using vessels like RV Polarstern and autonomous platforms including Argo floats and gliders deployed by the British Antarctic Survey and French Polar Institute Paul-Émile Victor. Studies focus on krill population dynamics, benthic community mapping with towed camera systems and remotely operated vehicles operated by institutions such as the Alfred Wegener Institute, time-series monitoring of penguin colonies by BirdLife International partners, and oceanographic sampling tied to projects funded by the National Science Foundation and national Antarctic programs. Data feeds into international synthesis efforts by the SCAR-MarBIN initiative and the Global Ocean Observing System.
Primary threats include commercial fishing pressure for Antarctic krill and toothfish managed through CCAMLR, climate-driven changes including warming and altered sea-ice regimes associated with Southern Annular Mode variability and global warming, and potential invasive species mediated by increasing human presence from research stations and vessel traffic by national programs like the United Kingdom Hydrographic Office-supported expeditions. Cumulative impacts are assessed in CCAMLR risk analyses and by environmental impact assessments required under the Protocol on Environmental Protection to the Antarctic Treaty for permitted activities.
Category:Marine protected areas of Antarctica