Amazon People

The Amazon has a long history of human settlement. Contrary to popular belief, sizable and sedentary societies of great complexity existed in the Amazon rainforest [Amazon Civilization Before Columbus]. These societies produced pottery, cleared sections of rainforest for agriculture, and managed forests to optimize the distribution of useful species. The notion of a virgin Amazon is largely the result of the population crash following the arrival of the Europeans in the sixteenth century. Studies suggest that 11.8 percent of the Amazon's terra firme forests are anthropogenic in nature resulting from the careful management of biodiversity by indigenous people. However, unlike those using current cultivation techniques, these Amazonians were attuned to the ecological realities of their environment from five millennia of experimentation, and they understood how to sustainably manage the rainforest to suit their needs. They saw the importance of maintaining biodiversity through a mosaic of natural forests, open fields, and sections of forest managed so as to be dominated by species of special interest to humans. 

Many of these populations existed along whitewater rivers where they had good means of transportation, excellent fishing, and fertile floodplain soils for agriculture. However, when Europeans arrived, these were the first settlements to be affected, since Europeans used the major rivers as highways to the interior. In the first century of European presence, the Amerindian population was reduced by 90 percent. Most of the remaining peoples lived in the interior of the forest: either pushed there by the Europeans or traditionally living there in smaller groups.

From Pizarro's conquest of the Inca empire until the end of the Brazilian rubber boom around the beginning of World War I, the Spanish and Portuguese, in the name of Catholicism with the blessing of popes, continued the long tradition of abuse against these people—one that would be continued by colonists, rubber tappers, and land developers.

Amazonians Today

Largest Cities in the Amazon: The bulk of the human population in the Amazon Basin is found in a cities which have emerged from the surrounding rainforest to become significant population centers. Outside the cities and towns, the Amazon is sparsely populated. City Country Urban Population Belem Brazil 1,912,600 Manaus Brazil 1,524,600 Iquitos Peru 349,300 Macapa Brazil 301,600 Porto Velho Brazil 292,000 Santarem Brazil 192,300

Today, despite the population decimation, natives peoples still live in American rainforests, although virtually all have been affected by the outside world. Instead of wearing traditional garb of loin cloths, most Amerindians wear western clothes, and many use metal pots, pans, and utensils for everyday life. Some groups make handicrafts to sell to the boatloads of tourists that pass through, while others make routine trips to the city to bring foods and wares to market. Almost no native group obtains the majority of its food by traditional nomadic hunting and gathering. Nearly all cultivate crops, with hunting, gathering, and fishing serving as a secondary or supplementary food source. Usually a family has two gardens: a small house garden with a variety of plants, and a larger plantation which may be one hectare in area planted with bananas, manioc, or rice. These plantations are created through the traditional practice of slash and burn, a method of forest clearing that is not all that damaging to the forest if conducted in the traditional manner.

Today almost no forest Amerindians live in their fully traditional ways. Perhaps only a few small groups in the Amazon basin can still claim to do so. One of these, the Tageri (part of the Waorani group), is highly threatened by oil development in Ecuador. Its plight has become an international battle among environmentalists, human rights activists, the government, and the oil industry.

Indian social mobilization of American indigenous peoples has attained the highest organization of any rainforest region. Forming ethnic organizations is one way to protect themselves, their culture, and their natural forest resources. Amerindians have faced a long, bitter battle against development of their land by outsiders, and today these organizations monitor these incursions on their lands. The Indian Missionary Council, CIMI, reported that land invasions of Brazilian Indian reservations by loggers and miners has risen since the mid-1990s. Loggers are increasingly trespassing on indigenous lands in search of mahogany, which can no longer be legally logged in Brazil. In the late 1990s and early 2000s, clashes between indigenous peoples and loggers, miners, and oil developers received some exposure in the Western press, notably the on-going saga between the native Yanomani of Brazil and Venezuela and thousands of small-scale miners, known as "garimpeiros" in Brazil, who often illegally mine on the natives' demarcated lands.

Using Google Earth and other technology to protect indigenous rights in the Amazon Deep in the most remote jungles of South America, Amazon Indians (Amerindians) are using Google Earth, Global Positioning System (GPS) mapping, and other technologies to protect their fast-dwindling home. Tribes in Suriname, Brazil, and Colombia are combining their traditional knowledge of the rainforest with Western technology to conserve forests and maintain ties to their history and cultural traditions, which include profound knowledge of the forest ecosystem and medicinal plants. Helping them is the Amazon Conservation Team (ACT), a nonprofit organization working with indigenous people to conserve biodiversity, health, and culture in South American rain forests.

The far-flung Yanomani Indian tribe inhabits a France-sized area of forest in northern Brazil and southern Venezuela. The Yanomani lived in virtual isolation after they were first documented by anthropologists in the 1920s until the 1970s when large numbers of gold miners invaded their territory. The miners introduced diseases, like measles, tuberculosis, the flu, and malaria to the resistant-deficient Yanomani, resulting in a significant decline in their population. Whereas an estimated 20,000 Yanomani lived in Brazil in the late 1970s, fewer than 9,000 existed in 1997. Violence between the Yanomani and the armed garimpeiros has also taken its toll resulting in many fatalities. Further, the garimpeiros disrupt the traditional Yanomani way of life by using mercury which pollutes local rivers, wildlife, and the Yanomani themselves. The miners' planes scare away the wildlife the Yanomani depend upon for food. The garimpeiros have also brought guns to the Yanomani meaning that inter-village disputes today are more likely to end in shootings.

Brazil has set aside large tracts of forests—roughly 12.5 percent of Brazil's total land area and 26.4 percent of the Amazon basin—for the indigenous population, which is made up of about 450,000 Indians or 0.25 percent of the total population. These indigenous reserves—set forth under Brazil's 1988 constitution—have helped the country's Indian population to rebound after centuries of decline. According to The Economist [Feb 2nd 2006], 60 percent of Brazil's Indian population lives in the Amazon.

These protected areas are not popular among poor farmers, landowners, and developers, who have tried to fight the establishment of new parks and indigenous reserves and are known to illegally exploit forest resources—especially mahogany and other valuable timber—within the boundaries of protected areas. Nevertheless, a 2006 studyconducted by researchers at the Woods Hole Research Center and the Instituto de Pesquisa Ambiental da Amazonia, found that parks and indigenous reserves in the Amazon help slow deforestation. Using quantitative analysis of satellite data, the research concluded that deforestation and the incidence of fires was significantly lower inside the perimeter of reserves and demarcated indigenous lands. 

News on the Amazon

Experts dispute recent study that claims little impact by pre-Columbian tribes in Amazon(07/05/2012) A study last month in the journal Science argued that pre-Columbian peoples had little impact on the western and central Amazon, going against a recently composed picture of the early Amazon inhabited by large, sophisticated populations influencing both the forest and its biodiversity. The new study, based on hundreds of soil samples, theorizes that indigenous populations in much of the Amazon were tiny and always on the move, largely sticking to rivers and practicing marginal agriculture. However, the study raised eyebrows as soon as it was released, including those of notable researchers who openly criticized its methods and pointed out omissions in the paper, such as no mention of hundreds of geoglyphs, manmade earthen structures, found in the region. 


Indigenous tribes occupy Belo Monte dam for over 10 days(07/03/2012) As of Tuesday, the occupation of Belo Monte dam by indigenous tribes entered its 13th day. Indigenous people, who have fought the planned Brazilian dam for decades, argue that the massive hydroelectric project on the Xingu River will devastate their way of life. According to a statement from the tribes, 17 indigenous villages from 13 ethnic groups are now represented at the occupation, which has successfully scuttled some work on the dam. 


96 percent of the world's species remain unevaluated by the Red List(06/28/2012) Nearly 250 species have been added to the threatened categories—i.e. Vulnerable, Endangered, and Critically Endangered—in this year's update of the International Union for Conservation of Nature's (IUCN) Red List. The 247 additions—including sixty bird species—pushes the number of threatened species globally perilously close to 20,000. However to date the Red List has only assessed 4 percent of the world's known species; for the other 96 percent, scientists simply don't know how they are faring. 


Brazil’s environmental leadership at risk, warn scientists(06/26/2012) The Brazilian government is putting its global environmental leadership at risk by ignoring scientific concern on large infrastructure projects and changes in the country's forest laws, warned an association of more than 1,200 tropical scientists gathering last week in Bonito, Brazil on the heels of the disappointing Rio+20 Earth Summit. 


Dams are 'centerpiece of greenwashing' in the Amazon(06/25/2012) Brazil's ambitious plans to build 30 dams in the Amazon basin could trump the country's efforts to protect the world's largest rainforest, said a leading Amazon scientist speaking at the annual meeting of the Association for Tropical Biology and Conservation (ATBC) in Bonito, Brazil. 


Small farmers cause substantial damage in the Amazon rainforest(06/25/2012) Small farmers are less likely than large landowners to maintain required forest cover on their property in the Brazilian Amazon, worsening the environmental impact of their operations, reported a researcher presenting at the annual meeting of the Association for Tropical Biology and Conservation (ATBC) in Bonito, Brazil. 


New geojournalism mapping platform for the Amazon(06/21/2012) A new mapping platform combines georeferenced environmental news articles with data on deforestation, fires, protected areas, and oil and gas concessions in the Amazon. 


Fire risk to increase in the Amazon rainforest(06/20/2012) The risk of fire could increase across large parts of the Amazon rainforest due to increasing incident of drought, expansion of road networks, and rural outmigration, said a scientist speaking at the annual meeting of the Association for Tropical Biology and Conservation (ATBC) in Bonito, Brazil. 


Over 700 people killed defending forest and land rights in past ten years(06/19/2012) On May 24th, 2011, forest activist José Cláudio Ribeiro da Silva and his wife, Maria do Espírito Santo da Silva, were gunned down in an ambush in the Brazilian state of Pará. A longtime activist, José Cláudio Ribeiro da Silva had made a name for himself for openly criticizing illegal logging in the state which is rife with deforestation. The killers even cut off the ears of the da Silvas, a common practice of assassins in Brazil to prove to their employers that they had committed the deed. Less than a year before he was murdered, da Silva warned in a TEDx Talk, "I could get a bullet in my head at any moment...because I denounce the loggers and charcoal producers." 


Protesters dig canal through Belo Monte dam in Brazil (Photos)(06/16/2012) In an symbolic protest of the giant Belo Monte Dam, Friday morning some 300 locals dug a channel in an earthen dam that blocks a portion of the Xingu River and serves as the first step of the controversial hydroelectric project, reports Amazon Watch. 


Brazilian beef giant on defensive on its Amazon sourcing practices(06/08/2012) JBS, the world's largest meat and leather company, is on the defensive after Greenpeace accused it of failing to abide by a 2009 agreement to implement safeguards that would exclude cattle produced on recently deforested lands in the Amazon. 


Brazil finalizes 2011 deforestation data(06/06/2012) Brazil's National Institute for Space Research (INPE) on Tuesday finalized its 2011 estimate for deforestation in the Amazon region. 


President Rousseff vetoes some controversial changes to Brazil's Forest Code(05/29/2012) Brazilian President Dilma Rousseff on Monday revealed the details of her line-item veto to proposed changes to the country's Forest Code, which governs how much forest landowners are required to preserve. Rousseff vetoed a dozen clauses of the revised Forest Code and modified several others. The bill now goes back to the Chamber of Deputies, followed by the Senate and House, before returning again to Rousseff. A final decision isn't expected until after the Rio+20 UN Conference on Sustainable Development. 


Tropical dams are a false solution to climate change(05/27/2012) Tropical dams emit considerably more greenhouse gas emissions than their temperate counterparts yet are being treated as a solution to climate change, warns a report published in Nature Climate Change. 


Brazil's Rousseff vetoes part of controversial Forest Code revision(05/25/2012) Brazilian President Dilma Rousseff today rejected 12 of 84 articles in a controversial bill that aims to relax restrictions on deforestation in the Amazon rainforest. The Brazilian government will announce the full details of the cuts on Monday. 


Greenpeace lifts pig iron ship blockade in Brazil(05/25/2012) Greenpeace suspended its blockade of a pig iron shipment in the Brazil after industry representatives and authorities agreed to meet to resolve issues raised in a recent report by the activist group. 


Value of timber stocks could predict future logging roads, deforestation in the Amazon(05/20/2012) A new model aims to forecast future logging road development by estimating the value of timber stocks across the Brazilian Amazon. The research, published in PLoS One, could help prioritize areas for conservation to protect the maximum area of forest. 


Brazilian deforestation lower in 2012 to date(05/18/2012) Deforestation in the Brazilian Amazon is lower in 2012 relative to the same period last year according to satellite-based data released by Imazon, an NGO. 


U.S. car manufacturers linked to Amazon destruction, slave labor(05/14/2012) According to a new report by Greenpeace, top U.S. car companies such as Ford, General Motors, and Nissan are sourcing pig iron that has resulted in the destruction of Amazon rainforests, slave labor, and land conflict with indigenous tribes. Spending two years documenting the pig iron trade between northeastern Brazil and the U.S., Greenpeace has discovered that rainforests are cut and burned to power blast furnaces that produce pig iron, which is then shipped to the U.S. for steel production. 


Greenpeace makes social media push for zero deforestation in Brazil(05/12/2012) Greenpeace is leveraging social media in its push for a zero deforestation target in Brazil. 

The Amazon rainforest, also known as Amazonia, is one of the world's greatest natural resources. Because its vegetation continuously recycles carbon dioxide into oxygen, it has been described as the "Lungs of our Planet". About 20% of earth's oxygen is produced by the Amazon rainforest.

The Amazon rainforest gets its name from the Amazon River, the life force of the rainforest. The Amazon River begins in the Peruvian Andes, and winds its way east over the northern half of South America. It meets the Atlantic Ocean at Belem, Brazil. The main river is about 4,080 miles long. Its drainage basin covers 2,722,000 million square miles, and lies in the countries of Brazil, Columbia, Peru, Venezuela, Ecuador, Bolivia, and the three Guyanas. Sixteen percent of all the world's river water flows through the Amazon delta. Twenty eight billion gallons of water flow into the Atlantic every minute, diluting the salinity of the ocean for more than 100 miles offshore. The Amazon rainforest watershed is home to the world's highest level of biodiversity.

Amazonia receives about 9 feet of rain every year. Fifty percent of this returns to the atmosphere through the foliage of trees. Most of the Amazon River's water comes from the annual snowmelt high in the Peruvian Andes. Between June and October, the water level rises by 30 to 45 feet. Tens of millions of acres of rainforest are covered by water as the flood advances, reaching as far inland from the main channel as 12 miles.

Some 15 million years ago, the Amazon River flowed westward into the Pacific Ocean. When the South American plate moved into another tectonic plate, the Andes Mountains slowly rose up and blocked the flow of the river. As the river system backed up, freshwater lakes were formed, and the environment of the Amazon basin changed drastically. Then about 10 million years ago the river found its way eastward towards the Atlantic.

The Amazon rainforest is the drainage basin for the Amazon River and its many tributaries. The northern half of the South American continent is shaped like a shallow dish. About 1,100 tributaries, seventeen of which are over 1,000 miles long, drain into this depression. Whenever rain falls in the river basin, it all drains into Amazon rainforest and into the Amazon River. The Amazon is the largest river system in the world. At some points, the Amazon River is one mile wide, while at other points it can be thirty-five miles wide. At Belem, where the river flows into the Atlantic Ocean, it can be 200 to 300 miles across, depending on the season. Some of the animals that make their home here are river otters, freshwater river dolphins, turtles, piranha, manatees, electric eels, and a remarkable, giant air-breathing fish called the piraracu.

The world's largest tropical rainforest, Amazonia covers more than half of Brazil. The canopy of Amazonia is less studied than the ocean floor. Scientists believe that the canopy may contain half of the world's species. Over 500 mammals, 175 lizards and over 300 other reptiles species, and one third of the world's birds live in Amazonia. It is estimated that about 30 million insect types can be found here. Competition for survival is fierce. This may explain why over millions of years of evolution so many highly adapted species have evolved in the canopy of Amazonia. The most intense competition is between animals and plants. Both plants and animals have made adaptations to defend themselves from being eaten, and to overcome these defensive systems. Plants trap sunlight and turn it into energy for themselves and the herbivores of the canopy.

Some animals found in the canopy are the harpy eagle, which preys on monkeys, kinkajous, sloth, reptiles, and other birds. Sloths spend most of their lives in the treetops. Their diet of low nutrition leaves forces them to conserve energy, causing the sloth to spend 80% of its life resting. A large portion of a howler monkey's diet consists of leaves, which are hard to digest. Their metabolism is so low that they need to warm themselves up in the sunlight after a chilly night. Leaf-cutter ants are responsible for harvesting a sixth of the area's leaves, bringing leaf fragments to their underground nests. They play a critical role in the rainforest's ecosystem by pruning the vegetation, which stimulates new growth, and breaking down the leaves to renew the soil.

The Amazon rainforest consists of four layers or communities. Each layer has unique ecosystems, plants, and animals adapted to that system. The emergent layer is the tallest layer, where trees can be as tall as 200 feet, and rise well above the canopy. Here they are exposed to fluctuation of temperature, wind, and rainfall. The leaves are small and covered with a thick waxy surface to hold water. They take advantage of the wind by developing winged seeds that are blown to other parts of the forest. Trunks can be up to 16 feet around and braced by massive buttress roots. Some of the animals find everything they need to survive in the emergent layer and never leave it.

The main layer of the rainforest is the canopy. Most canopy trees have smooth, oval leaves that come to a point, known as a drip tip. This allows water to flow off the leaf quickly and prevents the growth of fungi, mosses, and lichens. The canopy's leaves are very dense and filter out about 80% of the sunlight. Many flowers and fruits grow in this layer. Epiphytes cover every available surface and bromeliads provide drinking water for the many canopy creatures, and breeding pools for tree frogs.

The understory only gets about two to five percent of the available sunlight. The plants find unique ways to adapt to this shadowy existence. Their solar-collecting leaves grow large, and are dark green in color. They don't often grow more than 12 feet in height. Because there is very little air movement, they rely on insects and animals to pollinate their flowers. Some grow large flowers and fruits low on their trunks to allow larger, non-climbing animals to eat and disperse their fruit. The largest concentrations of insects inhabit this layer.

The forest floor is the lowest layer and almost no plants grow here. Only about 2% of the sunlight filters through. The floor is littered with decomposing vegetation and organisms that are broken down into usable nutrients. Many nutrients are locked into this biomass. Tree roots stay close to the surface to access these nutrients. Large animals forage for roots and tubers, while insects like millipedes, scorpions, and earthworms use the litter as a source of food.

Despite all of its abundant richness, Amazonia's giant trees grow in the poorest of soil. The top two inches of the acidic soil contains 99% of the nutrients. Nine tenths of the forest's energy is stored in the leaves and tissues of the trees themselves. The forest floor is a porous mass that prevents minerals and nutrients from being washed away and lost. As soon as a tree falls, or a creature dies, decomposers begin to turn it into a food source and mulch. The vegetation to renew the cycle quickly absorbs the nutrients that are released. This is the tightest, most efficient ecosystem in nature. The destruction of one part of the system can spell the destruction of the whole system.

High temperatures and the amount of rain are the same throughout the year in Amazonia. The climate is warm and humid, with average temperatures around 79° F. The difference between day and night time temperatures is greater than those between seasons.

Today, more than 20% of the Amazon rainforest has been destroyed and is gone forever. The land is being cleared for cattle ranches, mining operations, logging, and subsistence agriculture. Some forests are being burned to make charcoal to power industrial plants. More than half of the world's rainforests have been destroyed by fire and logging in the last 50 years. Over 200,000 acres are burned every day around the world, or over 150 acres every minute. Experts also estimate that 130 species of plants, animals, and insects are lost every day. At the current rate of destruction, it is estimated that the last remaining rainforests could be destroyed in less than 40 years.

Native peoples of the Amazon rainforest have used different plants for centuries as cures and potions for their health and survival. Scientists are now discovering that many of the plants are sources for new drugs for AIDS, cancer, diabetes, arthritis, and Alzheimer's. Quinine, muscle relaxants, steroids, and caner drugs have already been discovered. Today 121 prescription drugs sold around the world come from plant-derived sources. Although 25% of all drugs are derived from rainforest ingredients, scientists have tested only 1% of tropical plants.

Another concern for Amazonia is the fate of it indigenous people. An estimated 10 million Indians were living in Amazonia about five hundred years ago. Today there are less than 200,000 indigenous peoples left in Amazonia. More than 90 tribes have been destroyed since the 1900's. Most of the shamans and medicine men remaining are 70 years old or more. With them goes a wealth of knowledge of medicinal species of plants and organisms.

Amazon River

The Amazon River (US  /ˈæməzɒn/ or UK /ˈæməzən/; Spanish &Portuguese: Amazonas) in South America is the second longest  river in the world and by far the largest by waterflow with an average dischargegreater than the next seven largest rivers combined (not including Madeira and Rio Negro, which are tributaries of the Amazon). The Amazon, which has the largest drainage basin in the world, about 7,050,000 square kilometres (2,720,000 sq mi), accounts for approximately one-fifth of the world's total river flow.

In its upper stretches, above the confluence of the Negro River, the Amazon is called Solimões in Brazil; however, in Peru, Colombia and Ecuador, as well as the rest of the Spanish-speaking world, the river is generally called the Amazon downstream from the confluence of the Marañón and Ucayalirivers in Peru. The Ucayali-Apurímac river system is considered the main source of the Amazon.

The width of the Amazon varies between 1.6 and 10 kilometres (1.0 and 6.2 mi) at low stage, but expands during the wet season to 48 kilometres (30 mi) or more. The river enters the Atlantic Ocean in a broad estuary about 240 kilometres (150 mi) wide. The mouth of the main stem is 80 kilometres (50 mi). Because of its vast dimensions, it is sometimes called The River Sea. The first bridge in the Amazon river system (over the Rio Negro) opened on October 10, 2010. It is just outside Manaus.

Conservation and climate change

Conservation and climate change

Amazon Rainforest

Environmentalists are concerned about loss of biodiversity that will result from destruction of the forest, and also about the release of the carbon contained within the vegetation, which could accelerate global warming. Amazonian evergreen forests account for about 10% of the world's terrestrial primary productivity and 10% of the carbon stores in ecosystems of the order of 1.1 × 10¹¹ metric tonnes of carbon. Amazonian forests are estimated to have accumulated 0.62 ± 0.37 tons of carbon per hectare per year between 1975 and 1996.

One computer model of future climate change caused by greenhouse gas emissions shows that the Amazon rainforest could become unsustainable under conditions of severely reduced rainfall and increased temperatures, leading to an almost complete loss of rainforest cover in the basin by 2100. However, simulations of Amazon basin climate change across many different models are not consistent in their estimation of any rainfall response, ranging from weak increases to strong decreases. The result indicates that the rainforest could be threatened though the 21st century by climate change in addition to deforestation.

In 1989, environmentalist C.M. Peters and two colleagues stated there is economic as well as biological incentive to protecting the rainforest. One hectare in the Peruvian Amazon has been calculated to have a value of $6820 if intact forest is sustainably harvested for fruits, latex, and timber; $1000 if clear-cut for commercial timber (not sustainably harvested); or $148 if used as cattle pasture.

As indigenous territories continue to be destroyed by deforestation and ecocide, such as in the Peruvian Amazon indigenous peoples' rainforest communities continue to disappear, while others, like the Urarina continue to struggle to fight for their cultural survival and the fate of their forested territories. Meanwhile, the relationship between non-human primates in the subsistence and symbolism of indigenous lowland South American peoples has gained increased attention, as has ethno-biology and community-based conservation efforts.

From 2002 to 2006, the conserved land in the Amazon rainforest has almost tripled and deforestation rates have dropped up to 60%. About 1,000,000 square kilometres (250,000,000 acres) have been put onto some sort of conservation, which adds up to a current amount of 1,730,000 square kilometres (430,000,000 acres).

Deforestration

Deforestation is the conversion of forested areas to non-forested areas. The main sources of deforestation in the Amazon are human settlement and development of the land. Prior to the early 1960s, access to the forest's interior was highly restricted, and the forest remained basically intact. Farms established during the 1960s were based on crop cultivation and the slash and burn method. However, the colonists were unable to manage their fields and the crops because of the loss of soil fertility and weed invasion. The soils in the Amazon are productive for just a short period of time, so farmers are constantly moving to new areas and clearing more land. These farming practices led to deforestation and caused extensive environmental damage. Deforestation is considerable, and areas cleared of forest are visible to the naked eye from outer space.

Between 1991 and 2000, the total area of forest lost in the Amazon rose from 415,000 to 587,000 square kilometres (160,000 to 227,000 sq mi), with most of the lost forest becoming pasture for cattle. Seventy percent of formerly forested land in the Amazon, and 91% of land deforested since 1970, is used for livestock pasture. In addition, Brazil is currently the second-largest global producer of soybeans after the United States. The needs of soy farmers have been used to validate many of the controversial transportation projects that are currently developing in the Amazon. The first two highways successfully opened up the rain forest and led to increased settlement and deforestation. The mean annual deforestation rate from 2000 to 2005 (22,392 km² or 8,646 sq mi per year) was 18% higher than in the previous five years (19,018 km² or 7,343 sq mi per year).Deforestation has declined significantly in the Brazilian Amazon since 2004.

Bio Diversity

Wet tropical forests are the most species-rich biome, and tropical forests in the Americas are consistently more species rich than the wet forests in Africa and Asia. As the largest tract of tropical rainforest in the Americas, the Amazonian rainforests have unparalleled biodiversity. One in ten known species in the world lives in the Amazon Rainforest. This constitutes the largest collection of living plants and animal species in the world.

The region is home to about 2.5 million insect species,tens of thousands of plants, and some 2,000 birds andmammals. To date, at least 40,000 plant species, 2,200fishes, 1,294 birds, 427 mammals, 428 amphibians, and 378 reptiles have been scientifically classified in the region. One in five of all the bird species in the world live in the rainforests of the Amazon, and one in five of the fish species live in Amazonian rivers and streams. Scientists have described between 96,660 and 128,843 invertebrate species in Brazil alone.

The biodiversity of plant species is the highest on Earth with some experts estimating that one square kilometer (247 acres) may contain more than a thousand types of trees and thousands of species of other higher plants. According to a 2001 study, a quarter square kilometer (62 acres) of Ecuadorian rainforest supports more than 1,100 tree species.

One square kilometer (247 acres) of Amazon rainforest can contain about 90,790 tonnes of living plants. The average plant biomass is estimated at 356 ± 47 tonnes per hectare. To date, an estimated 438,000 species of plants of economic and social interest have been registered in the region with many more remaining to be discovered or catalogued.

The green leaf area of plants and trees in the rainforest varies by about 25% as a result of seasonal changes. Leaves expand during the dry season when sunlight is at a maximum, then undergo abscission in the cloudy wet season. These changes provide a balance of carbon between photosynthesis and respiration.

The rainforest contains several species that can pose a hazard. Among the largest predatory creatures are the black caiman, jaguar,cougar, and anaconda. In the river, electric eels can produce an electric shock that can stun or kill, while piranha are known to bite and injure humans. Various species of poison dart frogs secrete lipophilic alkaloid toxins through their flesh. There are also numerous parasites and disease vectors. Vampire bats dwell in the rainforest and can spread the rabies virus. Malaria, yellow fever and Dengue fever can also be contracted in the Amazon region.