Brazil's Atlantic Forest (Mata Atlântica)

Written by Jeremy Hance, Edited and updated by Rhett A. Butler

Coastal Mata Atlantica rainforest. Photo by Rhett A. Butler


Land Area: From approximately 1,233,875 square kilometers originally to 99,944 square kilometers today.
Human Population: Approximately 126 million people live in southeastern Brazil alone.
Countries: Mostly Brazil, but regions of Paraguay and Argentina, and a small area in Uruguay
Biodiversity: 264 mammals, 1,000 species of birds, over 750 species of reptiles and amphibians, 23,000 species of plants
Percent Forest Cover: Less than 7 percent of original biome extent, much of the area in small, degraded patches: 80 percent of the remaining ecosystem exits in fragments of less than half a square kilometer.
Deforestation Rate: Between 2000 and 2008, 277,763 hectares (2,777 square kilometers) of forest was lost. An average of 34,720 hectares (347 square kilometers) a year, or 0.35 percent loss annually.
Causes of Deforestation: Agriculture (primarily sugar cane and coffee), urban sprawl, cattle ranching, eucalyptus plantations.


No large tropical forest ecosystem has suffered so much loss as Mata Atlântica, also known as the Atlantic Forest. Encompassing a variety of tropical forest habitats—from dry forests to moist forests to coastal mangroves—the Mata Atlântica once stretched up-and-down Brazil's coastline, and covered parts of Paraguay, Uruguay, and Argentina. Today, it survives largely in small degraded patches and protected areas.

Historically, the Mata Atlântica made up over a 1.2 million square kilometers (about a quarter of the size of the Amazon), but after centuries of deforestation for timber, sugar cane, coffee, cattle ranching, and urban sprawl the Mata Atlântica has declined by well over 90 percent: today less than 100,000 square kilometers of the forest remains.

Although nearly adjacent to the Amazon rainforest, the Mata Atlântica has always been isolated from its larger and more famous neighbor. It is, in fact, more ancient than the Amazon. Being cut off from other tropical forests has allowed the Mata Atlântica to evolve unique ecosystems, which harbor a large number of species found no-where else on Earth.

Although very little remains, the Mata Atlântica is no-less threatened: logging for tropical woods, urban and rural sprawl, deforestation for agriculture and biofuels, charcoal collection, clearing for cattle ranching, hunting and poaching, and the simple isolation and small size of many of the forest fragments have placed the Mata Atlantic in truly a state of crisis.

In recent decades conservation organizations and governments have begun to recognize both the importance of and the heavy losses already incurred by the Mata Atlântica. A number of ambitious projects are underway, including reforesting large parts of the land, but there has yet to be a turning point in degradation. To date, every year a little more of the Mata Atlântica vanishes.


While most of the Mata Atlântica lines the eastern coast of Brazil, the forest complex also extends to three other countries Paraguay, Uruguay, and Argentina.

The Mata Atlântica is present in 13 of Brazil's 26 states, spreading into the interior from fifty to several hundred kilometers and rising as high as 2,000 meters. It spreads far into eastern Paraguay, covers apart of northeastern Argentina, and just touches the Uruguay coast.

Two of the world's largest cities, Sao Paulo and Rio de Janeiro, were both built over the Mata Atlântica. Increased urban and rural sprawl has cut into remaining pockets of forest.


Despite so little forest surviving, the Mata Atlântica remains remarkably rich in biodiversity and endemic species, many of them threatened with extinction.

In terms of flora researchers have cataloged over 23,000 plants, 40 percent of which are endemic to the Mata Atlântica. The area is especially rich in unique tree species—about half of which are endemic. A survey of a single hectare in Bahia found 450 tree species.

Regarding fauna, scientists have recorded 264 mammal species, nearly 1,000 birds, 456 amphibians, over 300 reptiles, and 350 freshwater fish. In all, 31 percent of these are found no-where else. Some taxa have higher endemism than others: for example, 61 percent (282 species) of the Mata Atlântica's amphibians are only found there.

New species continue to be found in the Mata Atlântica, in fact between 1990 and 2006 over a thousand new flowering plants were discovered The area has even yielded new primate species. In 1990 researchers discovered a new tamarin: the black-faced lion tamarin (Leontopithecus caissara). In 2006 researchers rediscovered the blonde capuchin (Cebus flavius), not seen—and largely forgotten about—since the 19th Century.

Sixty percent of Brazil's endangered species are in the Mata Atlântica. Due to a number of threats and species left in small, dwindling fragments, a Brazilian conservationist, Antonio Rossano Mendes Pontes, has called species in the Mata Atlântica: 'the living dead'.

Some standouts include:

  • The lion tamarins: One of two unique primate genera in the Mata Atlântica: the lion tamarins and the muriqui. Lion tamarins are comprised of four species, three of which are classified as Endangered, and one, the black-faced lion tamarin (Leontopithecus caissara), which is considered Critically Endangered.
  • Muriquis: Although little-known by the global public, the muriquis are America's largest primates. The northern muriqui (Brachyteles arachnoides)is classified as Critically Endangered and recent research has shown that the monkey live in a largely hierarchy-free, egalitarian social organization. The southern muriqui (Brachyteles hypoxanthus) is considered Endangered.
  • Blonde capuchin: Recently rediscovered the blonde capuchin (Cebus flavius) had not been recorded since the 18th Century. But researchers have found a small population of the species in nothereastern Brazil at the Pernambuco Endemism Center. The species has a bright tuft of blonde hair distinguishing it from other capuchins. It is considered Critically Endangered.
  • Brazilian arboreal mouse: Vanished for over 100 years, this species was thought extinct until recently when a number of individuals were sighted. In fact, despite being off biologists' radar for a century, the Brazilian arboreal mouse (Rhagomys rufescens) is now known to inhabit more areas than anyone could have hoped: it is classified as Near Threatened. However, it is feared that its population is in decline due to deforestation.
  • Maned sloth: A species of three-toed sloth endemic to the Mata Atlântica, so named because of its longhair. Due to continued habitat loss, the maned sloth (Bradypus torquatus) is considered Endangered. There are only six sloth species in the world.
  • Thin-spined porcupine: thought to be extinct, the thin-spined porcupine (Chaetomys subspinosus) was rediscovered in 1986. Debate over its taxonomy continues: whether the species is more closely related to porcupines or spiny rats.
  • Brazilian merganser: listed as Critically Endangered by the IUCN Red List. The Brazilian merganser (Mergus octosetaceus) is one of the world's most threatened species of waterfowl. Pollution and dams are the major threats. Researchers estimate less than 250 species survive.
  • Alagoas Curasow: Currently extinct in the wild, the alagoas curasow (Mitu mitu hasn't been seen since 1987. However, a captive population survives in Rio de Janeiro and there is hope that eventually the large beautiful bird could be reintroduced into the wild.
  • Brazilian Snake-Necked Turtle: this is one of Brazil's smallest turtles, growing no longer than 8 inches. The Brazilian snake-necked turtle (Hydromedusa maximiliani) is considered Vulnerable by the IUCN Red List.
  • Brazilian Gold Frog: the smallest frog in the southern hemisphere. All the frogs in this family—called Saddle-back frogs—are endemic to the Mata Atlântica. The Brazilian gold frog (Brachycephalus didactylus) is fortunately not threatened with extinction at this time.




The Mata Atlântica is home to two indigenous groups: the Tupi and the Guarani.

Today, the Tupi survive in small numbers in remote areas along Brazil's coastline and the country's northern highlands. Once the dominant people along Brazil's coast, the Tupi population may have numbered as many as one million when the Portuguese first arrived. But with the arrival of westerners the Tupi were decimated by disease, war, and slavery.

The Guarani are closely related to the Tupi but speak a different language. They live today in the southern lowlands of the Mata Atlântica, stretching from Brazil to Paraguay and Argentina. The Guarani language is still widely used in regions and is the second language of Paraguay. 46,000 Guarani live in Brazil today making them the largest tribe in the country, however they are threatened by the vast network of cattle ranching, sugar cane, and soy that has been established on their traditional lands.

In all over 130,000 Tupi and Guarani live in Brazil, Paraguay, and Argentina.


Mangroves: saline-adapted tropical forests on the coast. The Mata Atlântica has four separate regions of mangroves according to WWF. Mangroves are considered important buffers for tropical storms and nurseries for breeding fish. They also contain high levels of endemic species.

  • Montane moist forests: higher altitude wet forests across mountains and plateaus of southern Brazil.
  • Coastal Resingas: low forests that grow on coastal dunes.
  • Atlantic Moist Forests: also known as 'coastal forests', they are evergreen tropical forests with four-tiered structures.
  • Semi-deciduous forests: inland forests where trees drop their leaves in the dry season.
  • Atlantic Dry Forests: one of the furthest inland, this forest is a border between the cerrado and the caatinga shrublands. Tropical climate with five dry months.
  • Campo rupestre: high altitude shrubby grasslands.

Chart showing where the Atlantic Forest ranks among the world's largest rainforests in 2020.


To date less than 7 percent of the Mata Atlântica remains, and only 3 percent of the forest that once lined the entirety of Brazil's coast survives. Forest cover is better in other countries: in Argentina 48 percent of Mata Atlântica forests survive while 13 percent of Paraguay's forests still stand. However, both countries' forests face large threats.

Destruction of the Mata Atlântica began in the 1500s when the Portuguese first arrived on Brazil's shores. Wood exportation, especially of the valuable (and now nearly vanished) Brazil wood, began immediately, as did deforestation for cattle ranching and sugar plantations.

The area became the economic heart of Brazil by the nineteenth century producing timber, coffee, beef, sugar, charcoal, and firewood. In the twentieth century eucalyptus plantations took over vast areas of forest, making Brazil a top producer of wood pulp.

In Argentina where a sizable portion of the Mata Atlântica remains, clearing for yerba mate and tobacco plantations, pulp and paper, and logging continues to take its toll. Impoverished landless peasants are also moving into the area. Paraguay's Mata Atlântica forests are suffering much the same fate.


Today's threats to the Mata Atlântica are many and varied. Since the forest extends across four countries and encompasses a wide-variety of forest types, different areas have very different threats.

Clearing forests for agriculture—both industrial and small-scale—remains one of the largest causes for deforestation. Big crops in the region remain coffee and sugar. Vast forests have also been cleared for cattle ranching and eucalyptus plantations. In some areas forests are still cut for timber. In Argentina clearcutting for yerba mate and tobacco are a problem.

Urban sprawl from some of the world's largest metro areas continues to destroy pockets of the Mata Atlântica. Proximity to large urban areas also poses pollution problems. Outside of urban areas, rural towns and crops are expanding as well.

For species within surviving forest fragments, hunting and poaching is a problem in some areas. Poverty is a problem in many parts of the Mata Atlântica and people, desperate both for food and fuel, are exploiting the small pockets of forest.

The size of forest pockets and the distance between them worries many ecologists, as the forests are likely victims of edge-effects. In a changing climate, small pockets of forests will have less resiliency than larger stands to warmer temperatures.

Between 2005-2008, 102,938 hectares of the Mata Atlântica were destroyed, averaging 34,121 hectares per year (down slightly from an average of 34, 965 between 2000-2005). The most extensive losses occurred in the Brazilian states of Minas Gerias, Santa Catarina, and Bahia.

Forest loss in Brazil's Mata Atlantica according to National Space Research Institute, INPE


About 23,800 square kilometers of the Atlantic Forest is under protection. This is 23.8 percent of the Mata Atlântica's remaining forest, but less than 2 percent of its historic forest range.

In Brazil there are 224 protected areas in the region, including over a 100 state and national parks. Just over 20 percent of the original Argentine Mata Atlântica is protected in some 60 areas. Paraguay's forest, however, does not have the same level of protection: less than two percent of the original area is protected in eight areas.

A few notable protected areas:

  • Serra dos Orgaos National Park lies just an hour outside of Rio de Janerio and spans 11,000 hectares (110 square kilometers). The park is home to endangered birds like the Vinaceous-breasted parrot (Amazona vinacea), the Large-billed Seed-Finch (Oryzoborus crassirostris) and the Black-fronted Piping Guan (Pipile jacutinga).
  • Poço das Antas Biological Reserve is also close to Rio de Janeria (two hours), but the reserve and adjacent private area is home to the world's only wild population of golden lion tamarins, which has become a symbol for the Mata Atlântica.
  • Chapada Diamantina National Park spans three major Brazilian ecosystems: the Mata Atlântica, the cerrado, and the caatinga shrublands. The park is also home to Brazil's highest falls.
  • Iguazu National Park protects 67,000 hectares (670 square kilometers) of Argentina's Mata Atlântica region, as well as the world famous Iguazu falls. The park has 68 species of mammals, 422 birds, 38 reptiles, and 13 amphibians.
  • San Rafael National Park covers 70,000 hectares (700 square kilometers) of the Mata Atlântica in Paraguay. Classified an Important Bird Area (IBA) by International Birdlife, the park has little infrastructure and is considered by many to be simply 'a park on paper' with numerous impact from poaching to deforestation still on-going in the park.

A typical scenario in the Atlantic Forest at the Northeastern Biodiversity Corridor, where forest remnants are surrounded by sugarcane plantations. Most of the remaining forest fragments are, on average, smaller than 100 ha. Photo credit: Adriano Gambarini


Conservation awareness has come to the forefront in many parts of the Mata Atlântica; in addition there a number of new initiatives to protect remaining forests and even regrow new ones. However, the success of such projects remains to be seen. In the meantime, forest continues to be lost and species to vanish.

One initiative was established by Brazil's President, Luiz Inacio Lula da Silva, in November 2008. At the time Carlos Minc, Brazil's Environment Minister, said the government aims to restore the Atlantic forest to 20 percent of its original cover, which would require reforestation on an estimated 150,000 square kilometers—more than doubling the forest cover that survives today. It's an ambitious plan, but the proof will be in implementation.

A separate program by the Nature Conservancy is working to plant one billion trees over approximately 10,000 square kilometers in the Mata Atlântica. Donors can plant a tree for every US dollar given. So far the program has planted nearly six million trees.

The project is focusing on reforesting important watersheds in the area in order to improve their water quality. Farmers are being compensated for the amount of 'clean water' they produce byway of reforestation.

The Nature Conservancy hopes to complete the project by 2015.




The Latest Mata Atlântica News

A new mantis species rises from the ashes of Brazil’s National Museum (12 Mar 2020 17:15:56 +0000)
- Researchers have described a new species of praying mantis from Brazil’s Atlantic Forest, adding to the 250 known mantis species native to the country.
- The new species, Vates phoenix, belongs to a genus previously only known to occur in the Amazon.
- The researchers named it in honor of the National Museum of Brazil, which caught fire in September of 2018, leading to the destruction of 20 million items, including part of the entomological collection.
- Months earlier, the researchers had borrowed mantis specimens from that very collection to help them confirm that they indeed had a new species.

On the prowl: Jaguar population rises in Iguazú Falls region (11 Mar 2020 14:11:15 +0000)
- After almost losing its jaguar population in the early 2000s, the Atlantic Forest area between Brazil and Argentina has seen the number of the big cats more than double to 105.
- It’s the only place in South America that has registered an increase in the jaguar population, thanks to joint law enforcement by Brazil and Argentina to tackle poaching, and planting of camera traps by researchers, which deter would-be poachers.
- Changing agricultural trends have also helped: livestock ranching used to be the predominant farming activity in the area, but the jaguars would prey on the cattle and sheep, prompting ranchers to kill them in retaliation.
- In the past decade, soybean and corn crops have taken the place of ranching, reducing conflicts between jaguars and farmers.

Deforestation drops in Brazil’s Atlantic Forest, but risks remain: experts (31 Jul 2019 10:55:17 +0000)
- A joint report from the Brazilian National Institute for Space Research (INPE) and NGO Fundação SOS Mata Atlântica based on satellite imaging shows an annual reduction of 9.3 percent in deforested areas in the Mata Atlântica, the country’s most endangered biome.
- The cleared area in 17 Atlantic Forest states between October 2017 and April 2018 totaled 11,399 hectares (28,167 acres), which is 1,163 hectares (2,874 acres) less than over the same period a year earlier.
- However, intense pressure from agribusiness and the real estate market continues placing the Mata Atlântica’s ecosystems under threat, risks that include ongoing deforestation, losses in biodiversity, and potential extinction of species, experts warn.

Video: Scientists surprised to discover tiny toadlets can glow (29 Mar 2019 15:05:14 +0000)
- Pumpkin toadlets (Brachycephalus ephippium) inhabit Brazil’s Atlantic Forest, where they crawl through the leaf litter in search of mates.
- However, researchers found that they can’t hear their own high-frequency mating calls.
- While investigating how they communicate to find mates, the researchers unexpectedly discovered that the frogs fluoresce when exposed to UV light.
- The researchers aren’t sure why they do this, but say it could be a way to avoid predation or attract mates.

Global frog pandemic may become even deadlier as strains combine (03 Jul 2018 20:05:29 +0000)
- Batrachochytrium dendrobatidis – Bd for short – causes a disease called chytridiomycosis that affects a frog’s ability to absorb water and electrolytes through its skin. By 2007, Bd had spread around the world and had been implicated in the decline or extinction of some 200 species.
- A new study finds that hybridization between a native strain of Bd and the one that’s caused the global pandemic can lead to greater infection rates and illness strength than either can alone.
- It was conducted by researchers from universities in Brazil and the U.S. who looked at infection in several frog species in Brazil’s Atlantic Forest. They chose that region because of its high amphibian biodiversity (despite being one of the most deforested ecosystems on the planet), as well as because it is the only known region in the world where multiple strains of Bd coexist and hybridize.
- The researchers say their results indicate frogs may face a future even more dire than anticipated as different strains of Bd spread around the world and combine into more harmful forms. They call for increasing global monitoring efforts to detect these shifts before they lead to new outbreaks.

Pleistocene climates help scientists pick out targets for conservation in Brazil’s forests (08 May 2018 14:56:14 +0000)
- A team of scientists looked for places in the Amazon and the Atlantic Forest that have had stable weather patterns for a long time — going back to the Pleistocene Epoch — but that don’t fall within the boundaries of existing parks or reserves.
- They measured the efficiency of the current network of protected areas in these areas, and they also came up with a prioritization scale for conservation efforts that incorporated the locations of intact forest landscapes.
- The team reports that protected areas in the Amazon are four times as efficient at safeguarding these “climatically stable areas” as protected areas in the Atlantic Forest.

Deforestation in the Brazilian Atlantic Forest increased almost 60 percent in the last year (05 Jun 2017 02:33:32 +0000)
- The Atlantic Forest is one of the richest and most threatened biomes in the world, but only 15 percent of its original extent is preserved.
- Although the Atlantic Forest extends over 17 Brazilian states, four of them account for 90 percent of the losses.
- Recent changes in legislation and the expansion of agribusiness are noted as among main drivers of deforestation.

Forest fragmentation may be releasing much more carbon than we think (31 Mar 2017 17:24:29 +0000)
- Many tropical forests around the world have been severely fragmented as human disturbance split once-contiguous forests into pieces. Previous research indicates trees on the edges of these fragments have higher mortality rates than trees growing in the interiors of forests.
- Researchers used satellite data and analysis software they developed to figure out how many forest fragments there are, and the extent of their edges. They discovered that there are around 50 million tropical forest fragments in the world today; their edges add up to about 50 million kilometers – about a third of the way from the earth to the sun.
- When they calculated how much carbon is being released from tree death at these edges, they found a 31 percent increase from current tropical deforestation estimates.

Three new frog species found in disappearing Atlantic Forest (30 Mar 2017 17:03:16 +0000)
- The new species are of the Chiasmocleis genus of humming frogs. They spend most of their life underground, coming out only a few weeks a year for “explosive breeding.”
- The frogs look similar to species already known to science, but have distinct genes and minute physical differences that researchers used to set them apart.
- They were found in the Atlantic Forest, which has been heavily degraded by agriculture. As little as 3.5 percent of the biome may remain today.

Pressure over water in Brazil puts pulp industry in the spotlight (02 Mar 2017 05:32:01 +0000)
- Brazil is the world’s largest producer of eucalyptus-derived pulp and the state of Espírito Santo is one of its biggest production centers.
- More than a third of the state, which was once rich in Atlantic Forest, is at risk of becoming desert.
- The region faces one of the worst droughts in its history, which is causing billions in losses.

Brazilian state invites private companies to run Atlantic Forest parks (15 Dec 2016 17:08:29 +0000)
- São Paulo — Brazil’s wealthiest state and the country’s industrial powerhouse — has turned over the concessions for 25 state parks to the private sector. The parks protect a large portion of the Atlantic Forest, the most threatened biome in Brazil.
- Environmentalists worry that these company concessions, granted for 30 years, will lead to greater deforestation, though the government denies this possibility.
- Social advocates say that local people who rely on the parks for ecotourism jobs and other employment could easily be excluded from working in the parks by the for-profit companies.
- Critics say the law is unconstitutional because the state did not invite environmentalists and the people that would be impacted by the law to participate in discussions of the legislation before it was enacted.

One-Year Anniversary of Brazil dam disaster brings prosecutions (02 Nov 2016 22:09:41 +0000)
- One year ago, the collapse of the Fundão tailings dam killed 19 people and polluted the entire 663-kilometer (441-mile) length of the Rio Doce with 40 billion liters (over 10.5 billion gallons) of toxic mud tailings. It is the worst environmental and mining disaster in Brazil’s history.
- At the end of October, federal prosecutors charged 22 executives and four companies (Samarco, Vale, BHP Billiton and VOGBR Consultancy) for their role in the disaster that occurred in Mariana town, Minas Gerais state.
- The 272-page federal complaint includes numerous internal company documents that appear to show that Samarco knew of the threat their tailings dam posed to public safety, but did little to address the worsening problem.
- These internal documents went so far as to estimate the deaths likely to be caused by the dam collapse. Samarco’s estimate of 20 or more deaths was just one above the actual total of 19 people killed. The complaint also lists damage to commercial fisheries (14 tons of dead fish), to forests and communities.

Mystery surrounds death of 44 howler monkeys in Ecuador wildlife reserve (22 Feb 2016 12:42:56 +0000)
- In some areas in Ecuador, howler monkeys are affected by habitat loss due to forest fragmentation and illegal hunting.
- Ecuador’s Health Ministry has ruled out the theory that the primates’ deaths have something to do with dengue, chikungunya, yellow fever, or zika.
- While the local authorities look for the culprit, the 44 monkeys that were found dead have been buried in an isolated area within the Pacoche Reserve, to avoid any type of contamination of the surrounding areas.

Seven million hectares of forests have been lost in Argentina over the past 20 years (19 Feb 2016 11:14:13 +0000)
- Between 1998 and 2006, the deforested surface of Argentina was of almost 3,000 hectares –the equivalent of 250,000 hectares a year or one hectare every two minutes.
- A forest law was passed in march of 2007, despite opposition by some lawmakers from the largely deforested northern provinces.
- The funds assigned by the Argentinian Congress for forest protection in 2016 are 23 times less than what is established by the national forestry norm.

Loss of big animals reduces forests’ carbon-storing capacity (19 Dec 2015 15:04:00 +0000)
- Over-hunting contributes to forest carbon loss, claims a study published this week in the AAAS journal Science Advances.
- After looking at data from 31 sites from the Atlantic Forest researchers conclude that the over-hunting of large animals in those forests will eventually result in the widespread loss of the larger tree species responsible for storing the most carbon.
- The study lends further support for the need for conservation efforts that focus on protecting ecosystem services as a whole, as opposed to focusing on isolated measures such as hectares of forest, or numbers of trees left standing.