RAINFOREST INFORMATION

A Place Out of Time: Tropical Rainforests and the Perils They Face - information on tropical forests, deforestation, and biodiversity

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BACKGROUND INFORMATION ON THE RAINFOREST

Rainforests are forest ecosystems characterized by high levels of rainfall, an enclosed canopy and high species diversity. While tropical rainforests are the best-known type of rainforest and the focus of this section of the web site, rainforests are actually found widely around the world, including temperate regions in Canada, the United States, and the former Soviet Union.

Tropical rainforests typically occur in the equatorial zone between the Tropic of Cancer and Tropic of Capricorn, latitudes that have warm temperatures and relatively constant year-round sunlight. Tropical rainforests merge into other types of forest depending on the altitude, latitude, and various soil, flooding, and climate conditions. These forest types form a mosaic of vegetation types which contribute to the incredible diversity of the tropics.

The bulk of the world's tropical rainforest occurs in the Amazon Basin in South America. The Congo Basin and Southeast Asia, respectively, have the second and third largest areas of tropical rainforest. Rainforests also exist on some the Caribbean islands, in Central America, in India, on scattered islands in the South Pacific, in Madagascar, in West and East Africa outside the Congo Basin, in Central America and Mexico, and in parts of South America outside the Amazon. Brazil has the largest extent of rainforest of any country on Earth.

Rainforests provide important ecological services, including storing hundreds of billions of tons of carbon, buffering against flood and drought, stabilizing soils, influencing rainfall patterns, and providing a home to wildlife and indigenous people. Rainforests are also the source of many useful products upon which local communities depend.

While rainforests are critically important to humanity, they are rapidly being destroyed by human activities. The biggest cause of deforestation is conversion of forest land for agriculture. In the past subsistence agriculture was the primary driver of rainforest conversion, but today industrial agriculture — especially monoculture and livestock production — is the dominant driver of rainforest loss worldwide. Logging is the biggest cause of forest degradation and usually proceeds deforestation for agriculture.

Organization of this site

The rainforest section of Mongabay is divided into ten "chapters" (the original text for the site was a book, but has since been adapted for the web), with add-on content in the form of special focal sections (e.g. The Amazon, the Congo, REDD, New Guinea, Sulawesi, Forests in Brazil, etc), appendices, and other resources.

There is also a version of the site geared toward younger readers at kids.mongabay.com.

ABOUT THE RAINFOREST (SUMMARY)

RAINFOREST DISTRIBUTION AND CHARACTERISTICS

Each rainforest is unique, but there are certain features common to all tropical rainforests.

• Location: rainforests lie in the tropics.
• Rainfall: rainforests receive at least 80 inches (200 cm) of rain per year.
• Canopy: rainforests have a canopy, which is the layer of branches and leaves formed by closely spaced rainforest trees some 30 meters (100 feet) off the ground. A large proportion of the plants and animals in the rainforest live in the canopy.
• Biodiversity: rainforests have extraordinarily highs level of biological diversity or “biodiversity”. Scientists estimate that about half of Earth's terrestrial species live in rainforests.
• Ecosystem services: rainforests provide a critical ecosystem services at local, regional, and global scales, including producing oxygen (tropical forests are responsible for 25-30 percent of the world's oxygen turnover) and storing carbon (tropical forests store an estimated 229-247 billion tons of carbon) through photosynthesis; influencing precipitation patterns and weather; moderating flood and drought cycles; and facilitating nutrient cycling; among others.

The global distribution of tropical rainforests can be broken up into four biogeographical realms based roughly on four forested continental regions: the Afrotropical, the Australiasian, the Indomalayan/Asian, and the Neotropical. Just over half the world's rainforests lie in the Neotropical realm, roughly a quarter are in Africa, and a fifth in Asia.

These realms can be further divided into major tropical forest regions based on biodiversity hotspots, including:

1. Amazon: Includes parts of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela
2. Congo: Includes parts of Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of Congo
3. Australiasia: Includes parts of Australia, Indonesian half of New Guinea, Papua New Guinea
4. Sundaland: Includes parts of Brunei, Indonesia, Malaysia, Singapore
5. Indo-Burma: Includes parts of Bangladesh, Cambodia, China, India, Laos, Myanmar, Thailand, Vietnam
6. Mesoamerica: Includes parts of Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama
7. Wallacea: Sulawesi and the Maluku islands in Indonesia
8. West Africa: Includes parts of Benin, Cameroon, Côte d'Ivoire, Ghana, Guinea, Liberia, Nigeria, Sierra Leone, Togo
9. Atlantic forest: Includes parts of Argentina, Brazil, Paraguay
10. Choco: Includes parts of Colombia, Ecuador, Panama

Other countries that have large areas of rainforest include Bolivia, Cameroon, Central African Republic, Ecuador, Gabon, Guyana, India, Laos, Malaysia, Mexico, Myanmar, Papua New Guinea, Republic of Congo, Suriname, and Venezuela.

Cover and loss by rainforest region

RAINFOREST STRUCTURE

Rainforests are characterized by a unique vegetative structure consisting of several vertical layers including the overstory, canopy, understory, shrub layer, and ground level. The canopy refers to the dense ceiling of leaves and tree branches formed by closely spaced forest trees. The upper canopy is 100-130 feet above the forest floor, penetrated by scattered emergent trees, 130 feet or higher, that make up the level known as the overstory. Below the canopy ceiling are multiple leaf and branch levels known collectively as the understory. The lowest part of the understory, 5-20 feet (1.5-6 meters) above the floor, is known as the shrub layer, made up of shrubby plants and tree saplings.

RAINFOREST BIODIVERSITY

Tropical rainforests support the greatest diversity of living organisms on Earth. Although they cover less than 2 percent of Earth’s surface, rainforests house more than 50 percent of the plants and animals on the planet.

THE RAINFOREST CANOPY

In the rainforest most plant and animal life is not found on the forest floor, but in the leafy world known as the canopy. The canopy, which may be over 100 feet (30 m) above the ground, is made up of the overlapping branches and leaves of rainforest trees. Scientists estimate that more than half of life in the rainforest is found in the trees, making this the richest habitat for plant and animal life.

The conditions of the canopy are markedly different from the conditions of the forest floor. During the day, the canopy is drier and hotter than other parts of the forest, and the plants and animals that live there have adapted accordingly. For example, because the amount of leaves in the canopy can make it difficult to see more than a few feet, many canopy animals rely on loud calls or lyrical songs for communication. Gaps between trees mean that some canopy animals fly, glide, or jump to move about in the treetops. Meanwhile plants have evolved water-retention mechanisms like waxy leaves.

Scientists have long been interested in studying the canopy, but the height of trees made research difficult until recently. Today the canopy is commonly accessed using climbing gear, rope bridges, ladders, and towers. Researchers are even using model airplanes and quadcopters outfitted with special sensors — conservation drones — to study the canopy.

The rainforest floor

The rainforest floor is often dark and humid due to constant shade from the leaves of canopy trees. The canopy not only blocks out sunlight, but dampens wind and rain, and limits shrub growth.

Despite its constant shade, the ground floor of the rainforest is the site for important interactions and complex relationships. The forest floor is one of the principal sites of decomposition, a process paramount for the continuance of the forest as a whole. It provides support for trees responsible for the formation of the canopy and is also home to some of the rainforest's best-known species, including gorillas, tigers, tapirs, and elephants, among others.

Rainforest waters

Tropical rainforests support some of the largest rivers in the world, like the Amazon, Mekong, Negro, Orinoco, and Congo. These mega-rivers are fed by countless smaller tributaries, streams, and creeks. For example, the Amazon alone has some 1,100 tributaries, 17 of which are over 1,000 miles long. Although large tropical rivers are fairly uniform in appearance and water composition, their tributaries vary greatly.

Rainforest waters are home to a wealth of wildlife that is nearly as diverse as the biota on land. For example, more than 5,600 species of fish have been identified in the Amazon Basin alone.

But like rainforests, tropical ecosystems are also threatened. Dams, deforestation, channelization and dredging, pollution, mining, and overfishing are chief dangers.

Rainforest people

Tropical rainforests have long been home to tribal peoples who rely on their surroundings for food, shelter, and medicines. Today very few forest people live in traditional ways; most have been displaced by outside settlers, have been forced to give up their lifestyles by governments, or have chosen to adopt outside customs.

Of the remaining forest people, the Amazon supports the largest number of indigenous people living in traditional ways, although these people, too, have been impacted by the modern world. Nonetheless, indigenous peoples' knowledge of medicinal plants remains unmatched and they have a great understanding of the ecology of the Amazon rainforest.

In Africa there are native forest dwellers sometimes known as pygmies. The tallest of these people, also called the Mbuti, rarely exceed 5 feet in height. Their small size enables them to move about the forest more efficiently than taller people.

There are few forest peoples in Asia living in fully traditional ways. The last nomadic people in Borneo are thought to have settled in the late 2000's. New Guinea and the Andaman Islands are generally viewed as the last frontiers for forest people in Asia and the Pacific.

Deforestation

In recent decades there has been an important shift in deforestation trends. Today export-driven industries are driving a bigger share of deforestation than ever before, marking a shift from previous decades, when most tropical deforestation was the product of poor farmers trying to put food on the table for their families. There are important implications from this change. While companies have a greater capacity to chop down forests than small farmers, they are more sensitive to pressure from environmentalists. Thus in recent years, it has become easier—and more ethical—for green groups to go after corporations than after poor farmers.

Rainforests are also threatened by climate change, which is contributing to droughts in parts of the Amazon and Southeast Asia. Drought causes die-offs of trees and dries out leaf litter, increasing the risk of forest fires, which are often set by land developers, ranchers, plantation owners, and loggers.

Rainforest importance

While rainforests may seem like a distant concern, they are critically important for our well-being. Rainforests are often called the lungs of the planet for their role in absorbing carbon dioxide, a greenhouse gas, and producing oxygen, upon which all animals depend for survival. Rainforests also stabilize climate, house incredible amounts of plants and wildlife, and produce nourishing rainfall all around the planet.

Rainforests:

• Help stabilize the world’s climate: Rainforests help stabilize the world’s climate by absorbing carbon dioxide from the atmosphere. Scientists have shown that excess carbon dioxide in the atmosphere from human activities is contributing to climate change. Therefore, living rainforests have an important role in mitigating climate change, but when rainforests are chopped down and burned, the carbon stored in their wood and leaves is released into the atmosphere, contributing to climate change.
• Provide a home to many plants and animals: Rainforests are home to a large number of the world’s plant and animals species, including many endangered species. As forests are cut down, many species are doomed to extinction.
• Help maintain the water cycle: The role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest. In the Amazon, 50-80 percent of moisture remains in the ecosystem’s water cycle. When forests are cut down, less moisture goes into the atmosphere and rainfall declines, sometimes leading to drought. Rainforests also have a role in global weather patterns. For example researchers have shown that forests in South America affect rainfall in the United States, while forests in Southeast Asia influence rain patterns in southeastern Europe and China. Distant rainforests are therefore important to farmers everywhere.
• Protect against flood, drought, and erosion: Rainforests have been compared to natural sponges, moderating flood and drought cycles by slowing run-off and contributing moisture to the local atmosphere. Rainforests are also important in reducing soil erosion by anchoring the ground with their roots. When trees are cut down there is no longer anything to protect the ground, and soils are quickly washed away with rain. On steep hillsides, loss of forest can trigger landslides.
• Are a source for medicines and foods and support forest-dependent people: People have long used forests as a source of food, wood, medicine, and recreation. When forests are lost, they can no longer provide these resources. Instead people must find other places to get these goods and services. They also must find ways to pay for the things they once got for free from the forest.

Rainforest conservation

Rainforests are disappearing very quickly. The good news is there are a lot of people who want to save rainforests. The bad news is that saving rainforests will be a challenge as it means humanity will need to shift away from business-as-usual practices by developing new policies and economic measures to creative incentives for preserving forests as healthy and productive ecosystems.

Over the past decade there has been considerable progress on several conservation fronts. Policymakers and companies are increasingly valuing rainforests for the services they afford, setting aside large blocks of forests in protected areas and setting up new financial mechanisms that compensate communities, state and local governments, and countries for conserving forests. Meanwhile, forest-dependent people are gaining more management control over the forests they have long stewarded. Large international companies are finally establishing policies that exclude materials sourced via deforestation. People are abandoning rural areas, leading to forest recovery in some planes.

But the battle is far from over. Growing population and consumption means that rainforests will continue to face intense pressures. At the same time, climate change threatens to dramatically alter temperatures and precipitation patterns, potentially pushing some forests toward critical tipping points.

Thus the future of the world's rainforests in very much in our hands. The actions we take in the next 20 years will determine whether rainforests, as we currently know them, are around to sustain and nourish future generations of people and wildlife.

The Latest News on Rainforests

Sexual harassment rife in Vietnam’s conservation sector, survey reveals (25 Nov 2020 17:14:02 +0000)
- A survey by WildAct, a Vietnamese conservation organization, found that 82.5% of respondents have experienced some form of sexual harassment in the last two years.
- Those surveyed said that they feel most vulnerable while working in the field, and particularly when alcohol is involved.
- In response, WildAct has called for other organizations and government agencies in the sector to prohibit alcohol consumption during fieldwork.

Fueled by impunity, invasions surge in Brazil’s Indigenous lands (25 Nov 2020 16:46:00 +0000)
- After a decade-long struggle, Apyterewa was officially demarcated as a protected Indigenous territory in 2007, exclusively for the use of the Paracanã people who’ve called it home for generations.
- But despite these protections, Apyterewa has lost about 5% of its forest cover since 2007 as outsiders continue to move in and clear land for pasture, mines and timber.
- Deforestation seems to have picked up pace in recent months: satellites detected 83,445 deforestation alerts between Aug. 24 and Nov. 16, with several weeks registering “unusually high” levels of forest loss.
- Civil society advocates blame the Bolsonaro administration for the surging deforestation in Apyterewa and other protected areas: “We have a scenario of a weakening of the environmental agencies, which has been really profound,” said Danicley de Aguiar, an Amazon campaigner with Greenpeace. “It’s as if we threw a knife in the heart of Brazil’s environmental policy.”

Indigenous leader who fought for communities and conservation mourned in Peru (25 Nov 2020 09:05:45 +0000)
- Benjamín Rodríguez Grandez, a leader from the Huitoto tribe who dedicated his life to preserving Indigenous customs and the natural resources they depend on in the Peruvian Amazon, died of COVID-19 on July 16, 2020.
- Rodríguez was a key player in efforts to lobby for the creation of Peru’s Yaguas National Park, an area of 868,927 hectares (2.15 million acres) of forest home to more than 3,000 species of plants, 500 species of birds, and 550 fish species.
- He was also a teacher and a “judge of the peace,” a special title in Peru that allows community leaders to resolve certain disputes even if they don’t have a law degree.
- “If Benjamín convened the meeting, everyone attended,” one source told Mongabay. “He had that influence in the area.”

Trans-Purus: Brazil’s last intact Amazon forest at immediate risk (commentary) (24 Nov 2020 14:09:36 +0000)
- Brazil’s remaining Amazon forest is roughly divided in half by the Purus River, just west of the notorious BR-319 (Manaus-Porto Velho) highway. To the west of the river lies the vast “Trans-Purus” region — intact rainforest stretching to the Peruvian border. To the east, the forest is already heavily deforested, degraded and fragmented.
- Multiple threats are now closing in on the Trans-Purus region, and expected to increase greatly with the impending “reconstruction” of the BR-319. Planned roads linked to the BR-319 would open the Trans-Purus region to land grabbers (grileiros), organized landless farmers (sem-terras) and other actors from Brazil’s “arc of deforestation.”
- A massive planned gas and oil project would also likely lead to new road connections to the other planned highways in the Trans-Purus area, opening even more of the region to invasion. Asian oil palm and logging companies are among those with a historical interest in the area.
- This last large block of intact Brazilian Amazon forest is essential for ecosystem services — maintaining biodiversity, carbon stocks, and the forest water cycling functions essential for rainfall in other parts of Brazil and neighboring countries. This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.

Paraguay whistleblowers allege illegal deforestation cover up (20 Nov 2020 12:45:56 +0000)
- Senior officials at Paraguay’s Environment Ministry are allegedly helping cover up illegal deforestation by the country’s cattle industry.
- Last month, London-based NGO Earthsight reported that major European automakers, including Jaguar Land Rover and BMW, were using leather linked to illegal deforestation in Paraguay.
- Damning new testimony by current and former ministry employees suggests that in many cases environmental impact assessment applications are made long after the land in question has been cleared.

France falls short in ending deforestation linked to imported soy (20 Nov 2020 11:58:07 +0000)
- A new agreement signed by eight grocery store chains in France is aimed at ending the importation of soybeans grown on deforested lands.
- France introduced a national strategy to address deforestation in supply chains in 2018.
- But environmental and watchdog NGOs say the country must go beyond voluntary commitments from companies and mandate an end to trade with producers linked to deforestation.

New rule puts Indonesia’s protected forests up for grabs for agribusiness (20 Nov 2020 04:12:27 +0000)
- Indonesia’s environment ministry has issued a new regulation allowing protected forest areas to be cleared for a “food estate” program.
- The program is aimed at boosting domestic crop supplies, but critics say it prioritizes the interests of agribusiness at the expense of small farmers and the environment.
- Indonesia degazetted 26 million hectares (64 million acres) of its forest over the past 20 years, primarily for large-scale agriculture, and today has 29.7 million hectares (73.4 million acres) of protected forest, an area the size of Italy.
- Observers say the food estate program, if it goes ahead, should prioritize agroforestry systems that maintain a higher level of biodiversity than monocrops like oil palms or rice.

Bug bites: Edible insect production ramps up quickly in Madagascar (19 Nov 2020 15:38:07 +0000)
- In the last two years, two insect farming projects have taken off in Madagascar as a way to provide precious protein while alleviating pressure on lemurs and other wild animals hunted for bushmeat.
- One program, which promotes itself with a deck of playing cards, encourages rainforest residents in the northeast to farm a bacon-flavored native planthopper called sakondry.
- Another program focuses on indoor production of crickets in the capital city, Antananarivo.
- Both projects are on the cusp of expanding to other parts of the country.

The Amazon’s Yanomami utterly abandoned by Brazilian authorities: Report (19 Nov 2020 10:07:30 +0000)
- A new report highlights the escalating existential crisis among the 30,000 Indigenous people living in the Yanomami Territory, covering 9,664,975 hectares (37,317 square miles) in northern Brazil. Data shows that the Yanomami reserve is in the top ten areas now most prone to illegal deforestation in the Brazilian Amazon.
- The report accuses Jair Bolsonaro’s Brazilian government of abandoning the Yanomami to the invasion of their territory by tens-of-thousands of illegal miners. While the administration has launched sporadic operations to stop these incursions, the miners return as soon as police leave the reserve.
- Bolsonaro is also accused of having done little to combat COVID-19 or provide basic healthcare. As a result, pandemic case numbers have grown by 250% in the last three months, now possibly infecting 10,000 Yanomami and Ye’kwana, about a third of the reserve’s entire population, with deaths recorded among adults and children.
- “Children, young people and the generations to come deserve to live healthy lives in their forest home. Their futures should not be cut off by the actions of a genocidal administration,” says the report compiled by the Yanomami and Ye’kwana and a network of academics. Brazil’s Health Ministry denied the charge of negligence.

Multiplying Amazon river ports open new Brazil-to-China commodities routes (19 Nov 2020 07:00:06 +0000)
- Nearly 100 major industrial river ports have been built on the Brazilian Amazon’s major rivers over the past two decades. Many of the projects have been internationally financed and built by commodities companies with little government oversight.
- These ports have transformed the region, opening it to agribusiness and the export of commodities, especially soy, to China and the rest of the world. However, this boom in port infrastructure often came at the expense of the environment and traditional riverine communities.
- Today, more than 40 additional major river ports are planned in the Amazon biome on the Tapajós, Tocantins, Madeira and other rivers, projects again being pursued largely without taking cumulative socioenvironmental impacts into account.
- “What resources do these soy men bring to our city?” asked Manoel Munduruku, an Indigenous leader. “They only bring destruction.”

Podcast: Sumatra’s deforestation demystified (18 Nov 2020 15:55:04 +0000)
- Sumatra contains some of the largest tracts of intact rainforest left in the world, which are relied upon by Indigenous and local peoples plus a massive diversity of wildlife found nowhere else.
- These vast forests are under threat from the rapid expansion of industrial-scale agribusinesses that market both palm oil and pulp and paper products to the global market.
- To understand the causes of the threat better, this episode of the podcast interviews Nur Hidayati, director of top Indonesian environmental group Walhi, and Mongabay editor Philip Jacobson.
- They share that while there are some signs of progress, corruption and a lack of corporate transparency must be dealt with, and alternatives to the production of commodities like palm oil should be pursued.

‘CSI Amazon’: Epic study looks at what’s killing the rainforest’s trees (18 Nov 2020 09:59:05 +0000)
- A newly published study provides insight into why trees die in the Amazon, and why the rate of tree death may be increasing. The main risk factor explaining tree death was the mean growth rate of species.
- More than half, 51%, of tree deaths observed over the 30-year study were attributed to structural damage, mostly from windstorms.
- Different regions of the Amazon showed different risk factors for trees: Overall, the southern and western Amazon had higher mortality rates; wind seemed to do more damage in the western Amazon, whereas the southern Amazon had more tree death due to water stress and drought.
- The findings have major implications for the fight against climate change, given that the Amazon accounts for 12% of land-based carbon sink, but is losing that capacity as tree mortality increases.

Brazil’s Bem Querer dam: An impending Amazon disaster (commentary) (16 Nov 2020 14:18:48 +0000)
- Brazil’s President Jair Bolsonaro has announced his administration’s priorities for Amazon dams, including the planned Bem Querer dam on the Rio Branco in the far-northern state of Roraima.
- Bem Querer is primarily intended to increase the energy supply to industries in locations outside of Amazonia, rather than for residents of Roraima.
- Probable environmental impacts include blocking fish migrations and flooding a riparian forest that possesses extraordinary bird diversity. Downstream flow alteration would impact protected areas, including two Ramsar wetland biodiversity sites. Riverside dwellers would also be impacted.
- Sediment flow blockage would impact fisheries and the unique Anavilhanas Archipelago, a spectacular Brazilian national park. These adverse impacts need to be fully evaluated before a decision to build is made. This post is a commentary. The views expressed are those of the author, not necessarily Mongabay.

One Health: A necessary blend of biodiversity and human health goals (commentary) (16 Nov 2020 13:07:11 +0000)
- This week, the German Federal Foreign Office & WCS will co-host “One Planet, One Health, One Future: Moving forward in a post-COVID19 world.”
- The One Health approach acknowledges the interconnectedness of human, animal, and ecosystem health.
- COVID-19 provides an unfortunate but essential opportunity to demonstrate the fundamental importance of the One Health approach, and make connections with important biodiversity targets.
- This article is a commentary, the views expressed are those of the author, not necessarily of Mongabay.

Conserve freshwater or land biodiversity? Why not both, new study asks (16 Nov 2020 08:34:37 +0000)
- Freshwater ecosystems, such as rivers, lakes and streams, are home to 10% of all described species, but are often overlooked in conservation planning and their populations have shown rapid declines in recent decades.
- An analysis of aquatic and terrestrial biodiversity in two regions of the Amazon Basin found that conservation planning aimed only at plants and animals on land tends not to benefit freshwater species, whereas taking a freshwater focus benefited species in both realms.
- The widest benefits can be achieved with an integrated approach, the study found: considering the needs and sensitivities of both terrestrial and freshwater creatures increased freshwater benefits by 62-345% on average, with just a 1% trade-off to terrestrial benefits.
- The study highlights the urgent need for freshwater biodiversity conservation in the Amazon, and comes as policymakers and stakeholders prepare to negotiate new goals, targets and conservation frameworks for the coming decades.