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| Guinea Current Large Marine Ecosystem | |
|---|---|
| Name | Guinea Current Large Marine Ecosystem |
| Location | Gulf of Guinea, Atlantic Ocean |
| Countries | Nigeria; Ghana; Côte d'Ivoire; Guinea; Senegal; Sierra Leone; Liberia; Togo; Benin |
| Area km2 | 620000 |
| Max depth m | 4000 |
| Currents | Guinea Current |
| Major rivers | Niger River; Volta River; Gambia River |
| Notable ports | Lagos; Tema; Abidjan; Dakar |
Guinea Current Large Marine Ecosystem
The Guinea Current Large Marine Ecosystem is a coastal and offshore marine region along the Gulf of Guinea bordering West African states including Nigeria, Ghana, Côte d'Ivoire, Guinea, Senegal, Sierra Leone, Liberia, Togo, and Benin. It forms a transition zone between the temperate systems of the North Atlantic and the tropical waters of the Gulf of Guinea, influenced by major river inputs such as the Niger River and the Volta River. The region supports dense human populations around megacities like Lagos, Abidjan, and Dakar and sustains fisheries, oil and gas operations, and port industries.
The ecosystem spans the continental shelf and slope from the Senegalese coast near Cape Verde southward past the Bight of Benin to the coasts off Angola's northern border, encompassing shelf seas, estuaries, and coastal lagoons. Shelf widths vary markedly near river deltas such as the Niger River Delta and the Volta Delta, while bathymetric features include submarine canyons and the continental slope leading to abyssal plains influenced by the Atlantic Ocean. Major coastal features include the Bight of Benin, the Bight of Bonny, and the Gulf of Guinea islands and headlands that structure sediment transport and shoreline morphology.
Circulation is dominated by the eastward-flowing Guinea Current and interacting mesoscale eddies linked to the westward Equatorial Counter Current and seasonal shifts in the Intertropical Convergence Zone. Surface temperatures are tropical, moderated by upwelling cells off the coasts of Senegal and Sierra Leone during monsoon transitions driven by the West African monsoon and influences from the North Atlantic Oscillation. Freshwater discharge from the Niger River and Gambia River creates salinity gradients; suspended sediments from river plumes affect light penetration and primary productivity. Seasonal climate drivers include the African Easterly Jet and variability associated with the El Niño–Southern Oscillation and regional sea surface temperature anomalies.
Habitats range from mangrove forests along estuaries like the Sine-Saloum River and Komenda systems to seagrass beds and coral remnants near offshore banks. The region supports demersal fish assemblages, pelagic stocks, and invertebrate communities including penaeid shrimps and gastropods exploited in artisanal fisheries. Marine megafauna recorded include migratory populations of leatherback sea turtles, forage corridors used by humpback whales and sperm whales, and coastal occurrences of African manatees in estuaries. Biodiversity hotspots overlap with Important Bird Areas such as the Banc d'Arguin-style mudflats and with riverine wetlands that host migratory species linked to flyways used by birds tracked from Ramsar wetlands and protected areas.
Fisheries are central to livelihoods in coastal cities and towns including Lagos, Tema, and Abidjan; artisanal fleets using canoes and small engines operate alongside industrial trawlers and purse seiners registered to national fleets and companies headquartered in hubs like Port Harcourt and Takoradi. Target species include sardinella, small pelagic clupeids, mackerels, demersal croakers and sole, and penaeid shrimps supporting markets in regional ports and export chains connected to processors in Rotterdam and Barcelona. Offshore hydrocarbon fields and platforms operated by multinational corporations contribute to export revenues and infrastructure, linking the ecosystem to global energy markets and shipping lanes transiting through ports such as Abidjan and Tema.
Key threats include overfishing by domestic and distant-water fleets, destructive fishing gear, and illegal, unreported, and unregulated (IUU) fishing that undermines stocks. Pollution sources comprise oil spills from tanker traffic and offshore installations, effluents from mining and urban centers, and nutrient runoff that contributes to localized hypoxia and habitat degradation in estuaries like the Niger Delta. Climate change amplifies sea level rise, ocean warming, and changes in upwelling intensity, affecting spawning and recruitment of commercially important species. Conservation responses include marine protected areas established by national authorities, mangrove restoration projects supported by environmental NGOs, and community-based co-management models inspired by initiatives in West African reserves.
Management involves national ministries and agencies in Nigeria, Ghana, Côte d'Ivoire, and neighboring countries working alongside regional organizations such as the Economic Community of West African States and the Abidjan Convention. International partners including the United Nations Environment Programme and donor programs from institutions like the World Bank and European Union have supported assessments, capacity building, and transboundary action plans. Cooperative efforts address fisheries monitoring, maritime surveillance against IUU fishing, oil spill contingency planning coordinated with the International Maritime Organization, and data-sharing initiatives with research centers and universities across the region.
Category:Marine ecosystems of Africa