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| Ionian abyssal plain | |
|---|---|
| Name | Ionian abyssal plain |
| Location | Ionian Sea |
| Geology | Calypso Deep, Hellenic Trench, Mediterranean Ridge |
| Countries | Italy, Greece, Albania, Malta |
Ionian abyssal plain is the extensive deep-sea plain occupying much of the central and southern Ionian Sea basin, lying between the Calabrian Arc, the Hellenic Arc, and the Mediterranean Ridge. It forms a major component of the Mediterranean Sea deep-water system and is a focal area for studies by institutions such as the National Research Council (Italy), the Hellenic Centre for Marine Research, and the European Marine Observation and Data Network. The plain's depths, sediment cover, and circulation regimes link it to features including the Calypso Deep, the Adriatic Sea, and the wider Eastern Mediterranean.
The plain extends seaward from the continental slopes of Sicily, Salento, and the Peloponnese toward the central Ionian Sea abyssal basin, abutting the Hellenic Trench to the south and the Mediterranean Ridge to the east. Major nearby maritime boundaries involve Italy, Greece, Albania, and Malta, and shipping lanes connecting Genoa, Naples, Valletta, and Piraeus traverse adjacent waters. Bathymetric surveys by Institut Français de Recherche pour l'Exploitation de la Mer and Woods Hole Oceanographic Institution have mapped terraces and channels linked to tectonic outlines such as the Calabrian Arc and the Apulian Platform.
Tectonic evolution of the basin ties to the convergence between the African Plate and the Eurasian Plate, driving rollback of the Ionian slab and formation of the Hellenic Arc and the Calabrian Arc. The plain's substrate comprises hemipelagic and pelagic sediments atop oceanic crust influenced by emplacement events like the Messinian salinity crisis and Pleistocene glacio-eustatic fluctuations recorded in turbidite sequences. Sediment cores collected by expeditions from ODP and IODP reveal alternations of finely laminated calcareous ooze and siliciclastic turbidites linked to episodes such as the Last Glacial Maximum and the Younger Dryas. Authigenic mineral phases include ferromanganese nodules and authigenic carbonate linked to methane seepage associated with fault systems mapped by Geological Survey of Italy teams.
The plain resides within the pathway of Eastern Mediterranean deep and bottom waters formed in marginal basins like the Adriatic Sea and the Aegean Sea; it is influenced by currents including the Mediterranean Outflow and the Levantine Intermediate Water modification. Dense water cascading from the Adriatic Sea and episodes of open-ocean convection documented by Copernicus Marine Service contribute to bottom ventilation, while mesoscale features such as eddies traced by AVISO altimetry modulate sediment transport. Internal waves, benthic nepheloid layers, and turbidity currents observed with instruments from R/V Meteor and R/V Pourquoi Pas? sculpt channel-levee systems, and abyssal hydrography is routinely sampled by Argo and deep CTD programs.
Biotic communities on the plain include bathyal and abyssal assemblages of foraminifera, ostracods, nematodes, and benthic megafauna studied by teams from Marine Biological Association of the United Kingdom and the Station Biologique de Roscoff. Cold-water corals and sponge grounds occur on elevated topography adjacent to the plain, with trophic links to surface productivity driven by nutrient inputs from the Nile River historical discharges and contemporary atmospheric deposition traced by researchers at Max Planck Institute for Marine Microbiology. Chemosynthetic communities associated with methane seeps host symbiotic fauna resembling taxa known from the Black Sea and the Gulf of Cadiz, while deep-scattering layers and pelagic predators connect abyssal habitats to migratory routes sampled by tagging programs from Monaco Scientific Centre.
The area has been subject to multinational scientific campaigns by entities including International Ocean Discovery Program, European Union Horizon 2020, and national research fleets from Italy and Greece. Seismic reflection, multibeam mapping, and coring have been executed by vessels such as RRS Discovery and RV Pelagia, producing datasets archived in repositories like PANGAEA and EMODnet. The plain underlies routes for submarine cables linking hubs like Naples and Athens, and is proximal to offshore hydrocarbon exploration licensed by companies operating under regulations from authorities in Italy and Greece. Fisheries operating from ports including Bari and Kavala exploit pelagic stocks whose life cycles interact with abyssal processes.
Concerns focus on deep-sea mining potential for ferromanganese nodules, hydrocarbon extraction risks, litter and microplastic accumulation identified in surveys by United Nations Environment Programme and Ocean Conservancy, and impacts of climate-driven changes to deep-water formation documented by Intergovernmental Panel on Climate Change scenarios. Conservation initiatives involve marine spatial planning promoted by the General Fisheries Commission for the Mediterranean and protected area proposals informed by assessments from IUCN and regional agencies like the Regional Activity Centre for Specially Protected Areas (RAC/SPA). Long-term monitoring by EMODnet and research networks aims to detect shifts in benthic communities and biogeochemical cycles responding to anthropogenic pressures and natural variability.
Category:Ionian Sea Category:Deep sea plains Category:Mediterranean Sea