Wetlands of South America

Wetlands of South America
Name	Wetlands of South America
Location	South America
Area	Approx. 1.5 million km² (varies by definition)
Major wetlands	Pantanal, Paraná Delta, Beni Savanna, Amazon River floodplain, Chaco Wetlands
Countries	Brazil, Bolivia, Argentina, Paraguay, Uruguay, Peru, Colombia, Ecuador, Venezuela, Chile

Wetlands of South America are extensive floodplains, marshes, swamps, peatlands, and seasonally inundated savannas distributed across Amazon Basin, La Plata Basin, and Andean foothills, providing critical hydrological regulation, carbon storage, and habitat for migratory species. Spanning transboundary systems such as the Pantanal and the Paraná Delta, these wetlands intersect with major rivers like the Amazon River, Paraná River, and Orinoco River and with biomes including the Cerrado, Gran Chaco, and Atlantic Forest.

Overview and definitions

Definitions draw on international frameworks such as the Ramsar Convention and regional instruments like the Amazon Cooperation Treaty Organization to classify palustrine, lacustrine, riverine, and coastal wetlands; examples range from peat-forming Paramo bogs in Andes highlands to estuarine systems like the Rio de la Plata. Hydrological drivers include seasonal flooding from the Mamoré River, Madeira River, and Tapajós River and tidal influence from the Atlantic Ocean along the Uruguayan coast. Major anthropogenic actors influencing definitions include the International Union for Conservation of Nature, World Wildlife Fund, Conservation International, and national agencies such as Brazil’s ICMBio and Argentina’s Administración de Parques Nacionales. Classification and mapping efforts have engaged programs like Global Wetlands Project, MapBiomas, and the Amazon Cooperation Treaty Organization initiatives.

Major wetland regions

The Pantanal across Brazil, Bolivia, and Paraguay is the largest tropical wetland, fed by tributaries of the Paraguay River and neighbored by the Cerrado and Chaco. The Paraná Delta and lower Paraná River floodplain extend through Argentina and Paraguay, connecting to the Rio de la Plata estuary near Buenos Aires. Northern systems include the Orinoco Delta and Ciénagas de Juan Polo adjacent to Venezuela and Colombia, while Amazonian varzea and igapó forests occur throughout the Amazon Basin in Peru, Colombia, and Brazil. The Beni Savanna and Moxos plains in Bolivia are seasonally inundated, and Patagonian peatlands and the Valdivian temperate rainforest fringe floodplains in Chile and Argentina. Coastal mangrove complexes occur in Ecuador's Gulf of Guayaquil, Peru's Tumbes, and Brazil's Amapá and Bahia.

Biodiversity and ecosystems

Wetlands support iconic fauna such as the giant otter, hyacinth macaw, jabiru stork, capybara, black caiman, anaconda, and migratory shorebirds linked to the East Atlantic Flyway and Pacific Americas Flyway. Fish assemblages include migratory catfishes like Prochilodus species, commercial pacu, and arapaima, while macrophytes and aquatic plants feature Euterpe oleracea and Victoria amazonica alongside peat-forming sphagnums in Andean páramo bogs. Plant communities reflect transitions among Amazon rainforest, Atlantic Forest, Chaco thorn scrub, and savanna ecosystems such as the Cerrado and Campos. Endemic and threatened taxa are documented by institutions including the Smithsonian Tropical Research Institute, Museo Argentino de Ciencias Naturales, and Instituto Nacional de Pesquisas da Amazônia.

Human use and cultural significance

Indigenous nations such as the Ticuna, Yanomami, Guarani, Arawak, Matsés, and Moxo have long-standing relationships with wetlands for fisheries, floodplain agriculture, and cultural rites, with ethnobotanical knowledge recorded by researchers at Museu Paraense Emílio Goeldi and Instituto Socioambiental. Colonial and modern uses include cattle ranching in the Pantanal, rice cultivation in the Paraná Delta, artisanal and industrial fisheries tied to Manaus and Belem, and ecotourism centered on lodges near Bonito, Mato Grosso do Sul and Ibera Wetlands adjacent to Corrientes Province. Hydropower projects on rivers such as the Belo Monte Dam, Yacyretá Dam, and Itaipú Dam have reshaped flood regimes, while trade hubs like Manaus Free Economic Zone and ports at Belém and Buenos Aires integrate wetland resources into commodity chains.

Threats and conservation efforts

Threats include deforestation in the Amazon rainforest and Cerrado for soy and cattle linked to actors like Cargill, Bunge Limited, and Amaggi, mining in the Guianas and Andean foothills, hydrological alteration from dams by entities such as Eletrobras and binational commissions like Itaipu Binacional, pollution from urban centers like São Paulo and Lima, invasive species, and climate change impacts documented by the Intergovernmental Panel on Climate Change. Conservation initiatives include Ramsar designations, transboundary programs between Brazil and Bolivia, NGOs such as The Nature Conservancy and Wildlife Conservation Society, and scientific monitoring by International Large River Symposium collaborators. Community-based management, payment for ecosystem services pilots supported by the Green Climate Fund, and restoration projects in regions like the Ibera Wetlands illustrate adaptive strategies.

Legal frameworks and protected areas

Legal protection arises from instruments such as the Ramsar Convention listings, national protected area systems like Brazil’s SNUC and Argentina’s Sistema Nacional de Áreas Protegidas, and regional accords under the Amazon Cooperation Treaty Organization and Mercosur environmental dialogues. Key protected sites include Pantanal Matogrossense National Park, Jaú National Park, Tumucumaque Mountains National Park, Ibera Provincial Reserve, and Parque Nacional Natural Amacayacu, with governance involving agencies like ICMBio, SERNANP (Peru), and Parques Nacionales de Colombia. Litigation and policy reform have involved courts and institutions such as the Inter-American Court of Human Rights and national ministries of environment in landmark cases over indigenous rights and water management.

Category:Wetlands of South America