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| Atlantic Forest biome | |
|---|---|
| Name | Atlantic Forest |
| Area km2 | 100000 |
| Biome | Tropical and subtropical moist broadleaf forests |
| Countries | Brazil, Argentina, Paraguay, Uruguay |
Atlantic Forest biome The Atlantic Forest biome is a species-rich tropical and subtropical moist broadleaf forest complex along the Atlantic coast of South America, extending through southeastern Brazil, northeastern Argentina and eastern Paraguay. Recognized by conservation organizations such as World Wildlife Fund and scientific bodies like the International Union for Conservation of Nature, it has been the focus of landmark studies by institutions including the Smithsonian Institution and the Brazilian Institute of Geography and Statistics. Historically dissected by European colonization events involving the Treaty of Tordesillas and colonial administrations from Portugal and Spain, the region’s landscapes feature a mosaic of forest, mangrove, and highland ecosystems.
The Atlantic Forest spans coastal plains, interior plateaus, and the Serra do Mar and Serra da Mantiqueira mountain ranges, with distribution across states such as São Paulo (state), Rio de Janeiro (state), Bahia, and provinces like Misiones Province in Argentina. Major river basins including the Paraíba do Sul and Jequitinhonha River cross the biome, while metropolitan areas like São Paulo and Rio de Janeiro lie within its historical range, reflecting interactions with infrastructure projects such as the Trans-Amazonian Highway and port developments in Porto Alegre. Geopolitical boundaries shaped by the Congress of Vienna era have influenced land tenure, and protected areas established under laws inspired by the National Park Service (United States) model include units comparable to Iguaçu National Park in governance and tourism.
Climatic regimes range from humid tropical in coastal zones influenced by the South Atlantic Ocean to subtropical temperate conditions at higher elevations affected by the South Atlantic Convergence Zone and patterns studied by agencies like the National Oceanic and Atmospheric Administration. Ecoregions defined by conservationists such as Alan M. Friedlander and mapped by the World Wildlife Fund include lowland rainforests, montane cloud forests on the Mantiqueira Mountains, and mangrove systems along estuaries like the Guanabara Bay and Iguape-Cananéia-Paranaguá estuary complex. Climatic variability is linked to broader atmospheric phenomena such as the El Niño–Southern Oscillation and teleconnections with the Antarctic Circumpolar Current.
The Atlantic Forest harbors exceptional biodiversity documented by researchers at institutions including the Royal Botanic Gardens, Kew and the Museu Nacional (Brazil), with endemic lineages in taxa catalogued by projects like the Global Biodiversity Information Facility. Flora such as species of the genera Araucaria, Euterpe, and Dalbergia coexist with fauna including the lion tamarin complex, the jaguar, and the maned wolf in fringe areas; avian endemics recorded by the American Ornithological Society include species with restricted ranges. Mycological and invertebrate diversity have been assessed in collaborations between the Brazilian Agricultural Research Corporation and the California Academy of Sciences, revealing high rates of local endemism and cryptic speciation in amphibians described by authors publishing in journals like Science and Nature.
Primary ecosystem functions—carbon sequestration, hydrological regulation, and nutrient cycling—have been quantified in studies affiliated with Woods Hole Research Center and universities such as the University of São Paulo. Pollination networks involving hummingbirds and bats documented by the Smithsonian Tropical Research Institute and seed-dispersal mutualisms mediated by frugivores like toucans link to successional dynamics observed after disturbances from events comparable to the 1939 Chilean earthquake in scale of landscape change. Soil processes influenced by leaf litter decomposition are monitored in long-term plots established under programs modeled on the Long Term Ecological Research Network.
Indigenous populations including groups historically connected to the Atlantic Forest are represented in ethnographies produced by the Museu do Índio and records associated with the Jesuit Reductions era; colonial exploitation by Portuguese Empire settlers led to timber extraction and sugarcane agriculture tied to trade routes established by the Treaty of Madrid (1750). Afro-Brazilian cultural practices in quilombos and artisanal communities documented by the Instituto Socioambiental reflect sustained use of forest resources, while modern cultural landscapes have been shaped by migrations linked to industrialization in cities such as Curitiba and cultural recognition through listings by organizations like UNESCO.
Major threats include conversion to agriculture and pasture associated with commodities markets tied to firms in the São Paulo Stock Exchange, infrastructure expansion such as highway projects influenced by ministries modeled on the United States Department of Transportation, and illegal logging connected to organized networks scrutinized by agencies like INTERPOL. Fragmentation has reduced contiguous forest to small remnants recorded in assessments by the IUCN Red List and national inventories by the Brazilian Ministry of the Environment, leading to species declines documented in reports by the BirdLife International partnership and mitigation cases overseen by the Convention on Biological Diversity.
Restoration strategies promoted by NGOs such as Conservation International and community initiatives supported by the Global Environment Facility include native tree planting, creation of biological corridors linking reserves like Serra do Mar State Park and private reserves under programs inspired by Costa Rica’s payment for ecosystem services models. Scientific monitoring coordinated through consortia including the Brazilian Biodiversity Fund and academic networks like the International Union for Conservation of Nature Species Survival Commission guides adaptive management, while policy instruments have drawn upon legislation comparable to the Endangered Species Act and partnerships with certification schemes such as the Forest Stewardship Council.