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| Patos Lagoon | |
|---|---|
| Name | Patos Lagoon |
| Native name | Lagoa dos Patos |
| Location | Rio Grande do Sul, Brazil |
| Type | lagoon |
| Outflow | Atlantic Ocean |
| Basin countries | Brazil |
| Area | 10,000 km2 |
| Max depth | 5 m |
| Islands | Ilha da Pólvora, Ilha do Pontal, Ilha do Pintado |
Patos Lagoon Patos Lagoon is a large coastal lagoon in the Brazilian state of Rio Grande do Sul that forms a significant geomorphological feature on the South American Atlantic coast. The lagoon connects with the Atlantic Ocean near the city of Rio Grande and interacts with the Laguna dos Patos estuarine system, influencing regional transport between the Southern Cone ports and coastal cities. As a focus of research by Brazilian institutions and international programs, it has importance for fisheries, shipping, coastal ecology, and cultural identity.
Patos Lagoon lies within the state of Rio Grande do Sul near cities including Porto Alegre, Rio Grande, Pelotas, Bagé, and Camaquã basin outlets, and is bounded by features referenced by São José do Norte, Morro Redondo, Tavares, São Lourenço do Sul, and Rio Pardo River. The lagoon's orientation parallels the continental shelf adjacent to the South Atlantic Ocean and the Brazilian Highlands influence its watershed. Major rivers draining into the lagoon include the Jacuí River, Taquari River, and Sinos River, connecting inland basins to coastal plains influenced by the Pampa biome and the Atlantic Forest. The lagoon's morphology includes barrier islands and spits such as Cassino Beach and the mouth near the Ilha Grande de Santa Catarina projection, with geomorphological processes tied to the South American Monsoon System and the Falklands Current.
The lagoon's hydrology reflects inflow from tributaries including the Jacui River, Taquari River, and Guaíba River system and episodic exchange with the Atlantic Ocean at the outlet near Rio Grande. Tidal dynamics are moderated by the lagoon's shallow bathymetry and the influence of the Brazil Current and Benguela Current teleconnections through the South Atlantic Convergence Zone. Seasonal freshwater discharge patterns correlate with precipitation regimes controlled by El Niño–Southern Oscillation and the South Atlantic Convergence Zone, while wind-driven seiches and storm surges are linked to systems like Extratrópical Cyclone events. Sediment transport and deposition relate to fluvial load from the Taquari River basin and coastal longshore drift along Cassino Beach, affecting bathymetric evolution documented by researchers at Universidade Federal do Rio Grande do Sul and Universidade Federal de Pelotas.
The lagoon supports habitats utilized by species associated with the Pampa biome, Atlantic Forest remnants, and South Atlantic marine assemblages. Wetland and marsh zones host waterfowl and migratory birds recorded by studies tied to BirdLife International and regional observatories, with species lists including representatives related to Rhea americana distributions in adjacent grasslands and migratory shorebirds recorded by Comissão Nacional de Energia Nuclear-linked environmental programs. Aquatic communities encompass estuarine fishes such as mullets, silversides, and species familiar to Instituto Chico Mendes de Conservação da Biodiversidade surveys, while benthic invertebrates and submerged macrophytes provide habitat complexity studied by teams from Centro de Estudos do Mar (CESTEM). The lagoon is important for cetacean and pinniped sightings connected to broader South Atlantic populations monitored by Projeto Baleia Franca and similar initiatives that also cover Argentinaan coastal waters near Mar del Plata and Ushuaia migrations.
Human uses include artisanal and commercial fisheries that supply regional markets in Porto Alegre, Pelotas, and export through ports such as Port of Rio Grande. Agriculture in the surrounding Rio Grande do Sul pampas, including rice paddies and cattle ranching associated with enterprises in Bagé and Pelotas, relies on water inputs from lagoon tributaries. Navigation and shipping link to infrastructure like the Port of Rio Grande and transport corridors toward BR-116 and BR-392, while tourism centered on beaches such as Cassino Beach and birdwatching generates economic activity. Research and education activities involve institutions such as Universidade Federal do Rio Grande (FURG), Universidade Federal do Rio Grande do Sul (UFRGS), and regional NGOs collaborating with international bodies like UNESCO for coastal zone management studies.
The lagoon region has long-standing human presence including indigenous groups prior to European colonization, contacts noted in colonial records related to the Treaty of Tordesillas era and later Portuguese expansion with settlements such as Rio Grande and Pelotas. During the 19th century, the area was influenced by conflicts like the Ragamuffin War and interactions with neighboring territories of Uruguay and Argentina in shaping borders and economic networks. Cultural life reflects gaucho traditions associated with the Pampa and literary references in Brazilian works and regional folklore, with museums in Pelotas and Rio Grande preserving artifacts linked to maritime and ranching history. The lagoon figures in navigation charts produced in collaboration with the Brazilian Navy hydrographic service and has been a subject in scientific expeditions involving institutions such as Instituto Oceanográfico da Universidade de São Paulo.
Conservation challenges include eutrophication from agricultural runoff tied to rice cultivation, urban effluents from Porto Alegre and Pelotas, habitat loss affecting species monitored by ICMBio programs, and impacts from invasive species documented by researchers at Universidade Federal de Pelotas. Efforts to address these issues involve protected area designations, monitoring by bodies like Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis and regional environmental agencies collaborating with international frameworks such as the Ramsar Convention and projects supported by World Wildlife Fund initiatives. Climate change projections from groups including Intergovernmental Panel on Climate Change consider sea-level rise and altered precipitation patterns that may exacerbate saltwater intrusion and alter freshwater inflows, prompting integrated management approaches championed by universities and municipal governments in Rio Grande do Sul.
Category:Lagoons of Brazil