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

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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.

雷竞技官网欢迎热带雨林通常发生在雷竞技体育下载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 thesecond and third largest areasof tropical rainforest. Rainforests also exist on some the Caribbean islands, in Central America, in India, on scattered islands in the South Pacific, inMadagascar, 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,lol赔率雷电竞 ,New Guinea,Sulawesi,Forests in Brazil, etc), appendices, and other resources.

There is also a version of the site geared toward younger readers atkids.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 estimated229-247 billion tons of carbon) through photosynthesis;influencing precipitation patterns and weather;moderating flood and drought cycles; andfacilitating 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.

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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.

雨林海域拥有丰富的野生动物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.

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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.

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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.

雷竞技体育下载热带雨林也受到气候变化的威胁,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.

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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 thatforests 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

New ‘snug,’ a snail with a too-small shell, described from Brunei rainforest(Apr 27 2023)
- A group of researchers and citizen-scientists have identified a new semi-slug species, Microparmarion sallehi, from the lowland rainforests of northern Borneo Island.
- Their study suggests there may be some half a dozen other species from the same genus waiting to be described, highlighting the rich biodiversity of this region.
- For this description, the local and international scientists involved students and laypersons in the team on a combined program of biodiversity training and exploration.
- The study authors note that scientific knowledge of Southeast Asian slugs in general is lacking due to low collection samples, meaning the prospects for describing a new species is high.

High-carbon peat among 1,500 hectares cleared for Indonesia’s food estate(Apr 26 2023)
- A number of reports have found that an Indonesian government program to establish large-scale agricultural plantations across the country has led to deforestation.
- More than 1,500 hectares (3,700 acres) of forests, including carbon-rich peatlands, have been cleared in Central Kalimantan province for the so-called food estate program, according to a spatial analysis by the NGO Pantau Gambut.
- Last year, the NGO Kaoem Telapak detected 100 hectares (250 acres) of deforestation in food estate areas in North Sumatra.
- Villagers whose lands have been included in the program have also reported an increase in the severity of floods since their forests were cleared to make way for the food estates.

Professional services abound for Amazon land grabbers seeking legitimacy(Apr 25 2023)
- How does public land in the Brazilian Amazon, including chunks of protected areas and Indigenous territories, end up under private ownership?
- This investigation unveils the network of realtors and engineers who take advantage of Brazil’s disjointed land registration system to launder stolen land.
- Experts say the CAR land registry in particular, which was meant to prevent environmental crimes, has instead made land grabbing easier than ever.
- This article was originally published in Portuguese by The Intercept Brasil and is part of the Ladrões de Floresta (Forest Thieves) project, which investigates the appropriation of public land inside the Amazon and is funded by the Pulitzer Center’s Rainforest Investigations Network.

Mongabay Explores the Congo Basin: The ‘heart of the world’ is at a turning point(Apr 25 2023)
- Mongabay Explores is a podcast series exploring the world’s unique places, species and the people working to save them.
- This first episode in our fourth season explores the Congo Basin, its vast biodiversity, environmental challenges and conservation solutions.
- Home to the world’s second-largest rainforest, it also contains unique flora and fauna found nowhere else and some of the world’s most carbon-rich peatlands.
- Featured on this episode are Conserv Congo founder Adams Cassinga and Joe Eisen, executive director of Rainforest Foundation UK, who discuss the roadblocks to protecting peatlands and rainforests from resource extraction, the challenges with foreign aid and the difficult situation locals face in a nation wracked by conflict and insufficient critical infrastructure.

The more degraded a forest, the quieter its wildlife, new study shows(Apr 24 2023)
- Tropical forest researchers are increasingly using bioacoustics to record and analyze ecosystem soundscapes, the sounds that animals make, which in turn can be used as a proxy for forest health.
——研究音景in logged rainforests in Indonesian Borneo have tested a novel approach that could provide a reliable and low-cost way for conservation agencies and communities to monitor tropical forest health.
- Their new method, which partitions animal groups into broad acoustic frequency classes, offers a stop-gap method for measuring acoustic activity that could be used in the short-term until more detailed artificial intelligence and machine-learning technology is developed.
- During their study, they found that animal sounds diminished and became asynchronous in forests disturbed by selective logging, factors that could be used as proxies for disturbed habitats.

We need to show that planetary wins are possible, says Dax Dasilva(Apr 24 2023)
- In 2021 Canadian entrepreneur Dax Dasilva donated $40 million to launch “Age of Union,” which supports conservation projects working to address climate change and the extinction crisis.
- Dasilva aims to bring a startup mentality to conservation, supporting grassroots, locally-led, and Indigenous-led projects with resources and guidance on scaling impact.
- Age of Union places a strong emphasis on storytelling to demonstrate that conservation efforts can have an impact, and has supported short documentaries and social media videos: “One of the main things we want to do is to show people that things can be done,” said Dasilva. “The worst outcome would be for people to stop believing that we’re out of time and that there’s nothing left to do.”
- Dasilva spoke about his passions, his philosophy on conservation, and more during a March 2023 conversation with Mongabay Founder Rhett A. Butler.

Camera trap images of rare gorillas with infants bring hope in DRC(Apr 21 2023)
- Camera traps in the Tayna Nature Reserve in the Democratic Republic of Congo have recorded two mother-infant pairs of eastern lowland gorillas, confirming the presence of healthy family groups in one of their last strongholds.
- This subspecies is critically endangered, with only 6,800 individuals left in the world, and is threatened by hunting, deforestation and mining activities
- Gorilla Rehabilitation and Conservation Education (GRACE) operates the world’s only sanctuary for rescued eastern lowland gorillas, and employs local communities in a key role in monitoring efforts in Tayna.

Report warns of rising violence against environmental defenders in Mexico(Apr 21 2023)
- A new report from the Mexican Center for Environmental Law (CEMDA) says the country is experiencing a rise in violence against environmental defenders, who suffer everything from intimidation to kidnapping to murder.
- The violence spans the country and numerous economic sectors, including mining, urban expansion, infrastructure, logging, agriculture and energy.
- In total, CEMDA counted 197 instances of aggression in 2022 — nearly double from the previous year — of which 24 resulted in death.
- CEMDA called on the government to improve protections for sensitive ecosystems and cultural patrimony while deprioritizing harmful industries like mining and hydrocarbons.

Indigenous women in Colombia protect rich Amazonian wetland from overfishing(Apr 20 2023)
- Dozens of Indigenous women in Colombia’s Amazon are monitoring, managing, raising awareness and restoring a wetland ecosystem impacted by overfishing.
- After partnering with environmental organizations to establish a fishing agreement in the area, they have witnessed the increase and recovery of fish species such as sardines, catfish and the pirarucu (Arapaima gigas).
- The wetland area of Lake Tarapoto, located in the department of Amazonas in southern Colombia, provides a habitat for numerous aquatic animals and supports the livelihoods of 22 Indigenous communities.

Mining may contribute to deforestation more than previously thought, report says(Apr 20 2023)
- A new report from WWF says there are still considerable discrepancies about how mining-related deforestation is occurring, and why.
- Most mining-related deforestation is driven by gold and coal. Other minerals like bauxite, iron ore and copper are also major drivers.
- Mining clears the forest to dig excavation pits and access roads. But the report stressed that more attention needs to be paid to the indirect impacts of mining, such as the construction of infrastructure for energy, processing and storage, as well as local economic development that leads to in-migration and settlements.

EU parliament passes historic law forcing companies to track deforestation(Apr 20 2023)
- A law passed by the European Parliament requires companies working in cattle, cocoa, coffee, palm oil, rubber, soy and wood to demonstrate their products aren’t sourced to deforested land or land with forest degradation, or else risk heavy fines.
——公司必须提交“尽职调查”再保险ports showing they took proper steps to verify the origins of their products while also complying with countries’ local regulations on human rights and impacts on Indigenous people.
- Critics say the legislation may still lack the teeth to prevent deforestation, especially if political pressure from traders forces EU countries to overlook their noncompliance with the new regulations.

Study attempts to foresee the future of Amazonian mammals if the rainforest turns into savanna(Apr 18 2023)
- What could become of the some 300 species of mammals living in Amazonia if deforestation and global warming lead to the savannization of the rainforest?
- Researchers analyzed images from 400 photo traps placed in four natural enclaves of the Cerrado biome in southern Amazonia to find some answers; analysis of the photos showed that, when given the choice between preserved Amazon Rainforest and preserved Cerrado, most species chose the rainforest.
- Another study analyzed rainforests around the world, finding that savannization may happen sooner than expected; in Amazonia, this occurrence will mean reduced population and range for mammals like jaguars, tapirs and deer.

Return of the GEDI: Space-based, forest carbon-mapping laser array saved(Apr 17 2023)
- Since 2018, the GEDI mission has been firing lasers from the International Space Station to measure aboveground biomass on Earth.
- The information gleaned from it has been crucial for scientists to understand how deforestation contributes to worsening climate change.
- The mission was supposed to be decommissioned earlier this year, with the lasers fated to be jettisoned from the ISS and burned up in the atmosphere.
- However, NASA made a last-minute decision to extend the mission after a push from the scientists involved in it: the GEDI equipment will be put into storage for 18 months, then reinstated to resume operations for as long as the ISS continues to run.

Power of traditional beliefs lies at the heart of an anti-mine campaign in PNG(Apr 17 2023)
- A newly published study published explores the important role that traditional Papua New Guinean beliefs play in an ongoing campaign against a copper and gold mine on a tributary of the Sepik River.
- Critics say the controversial mine project could potentially pollute one of the most biologically and culturally diverse places on Earth, while supporters point to potential development benefits.
- The Save the Sepik campaign against the mine harnesses traditional governance structures and beliefs, acknowledging the spirits of ancestors, the land and river, in a declaration that has become a rallying cry for the campaign.
- The campaign’s success so far — licenses haven’t been awarded for the mine project — is part of a growing global movement that acknowledges the close relationship some communities have with a sentient environment.

World’s newest great ape faces habitat loss, multiple threats: Will it survive?(Apr 14 2023)
- Scientists designated the Tapanuli orangutan (Pongo tapanuliensis) as a new species in 2017, and it was immediately noted as being the rarest and most threatened great ape with fewer than 800 individuals in western Indonesia.
- The IUCN estimated the apes’ population fell by 83% in recent decades, and the species continues to face grave threats due to habitat loss, a gold mine, a hydroelectric plant and the expansion of croplands.
- While some conservation efforts offer hope, researchers say a coordinated plan is needed to ensure the species survives.