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The Amazon: The World's Largest Rainforest Reflecting environmental conditions as well as past human influence, the Amazon is made up of a mosaic of ecosystems and vegetation types including rainforests, seasonal forests, deciduous forests, flooded forests, and savannas. The basin is drained by the Amazon River, the world's largest river in terms of discharge, and the second longest river in the world after the Nile. The river is made up of over 1,100 tributaries, 17 of which are longer than 1000 miles, and two of which (the Negro and the Madeira) are larger, in terms of volume, than the Congo (formerly the Zaire) river. The river system is the lifeline of the forest and its history plays an important part in the development of its rainforests. HISTORY
About ten million years ago, waters worked through the sandstone to the west and the Amazon began to flow eastward. At this time the Amazon rainforest was born. During the Ice Age, sea levels dropped and the great Amazon lake rapidly drained and became a river. Three million years later, the ocean level receded enough to expose the Central American isthmus and allow mass migration of mammal species between the Americas. The Ice Ages caused tropical rainforest around the world to retreat. Although debated, it is believed that much of the Amazon reverted to savanna and montane forest (see chapter 3-Ice Ages and Glaciation). Savanna divided patches of rainforest into "islands" and separated existing species for periods long enough to allow genetic differentiation (a similar rainforest retreat took place in Africa. Delta core samples suggest that even the mighty Congo watershed was void of rainforest at this time). When the ice ages ended, the forest was again joined and the species that were once one had diverged significantly enough to be constitute designation as separate species, adding to the tremendous diversity of the region. About 6000 years ago, sea levels rose about 130 meters, once again causing the river to be inundated like a long, giant freshwater lake. THE AMAZON RIVER TODAY
The river current carries tons of suspended sediment all the way from the Andes and gives the river a characteristic muddy whitewater appearance. It is calculated that 106 million cubic feet of suspended sediment are swept into the ocean each day. The result from the silt deposited at the mouth of the Amazon is Majaro island, a river island about the size of Switzerland. (NEXT Amazon rainforest ecology) Recent news on the Amazon Deforestation emissions should be shared between producer and consumer, argues study (11/19/2009) Under the Kyoto Protocol the nation that produces carbon emission takes responsibility for them, but what about when the country is producing carbon-intensive goods for consumer demand beyond its borders? For example while China is now the world's highest carbon emitter, 50 percent of its growth over the last year was due to producing goods for wealthy countries like the EU and the United States which have, in a sense, outsourced their manufacturing emissions to China. A new study in Environmental Research Letters presents a possible model for making certain that both producer and consumer share responsibility for emissions in an area so far neglected by studies of this kind: deforestation and land-use change. Ecological benefits of REDD boosted by inclusion of private landowners, potentially harmed by plantations (11/17/2009) Reducing Emissions from Deforestation and Degradation [REDD] programs that include landowners will conserve more habitat and ensure greater ecosystem services function than programs that focus solely on protected areas, report researchers from the Woods Hole Research Center (WHRC), the Instituto de Pesquisa Ambiental da Amazônia (IPAM), and the Universidade Federal de Minas Gerais (UFMG). Brazil pledges to restrain emissions growth (11/15/2009) In a move that some observers say could provide a path forward on a future climate agreement that includes emissions cuts in developing countries, Brazilian President Luiz Inacio Lula da Silva said his country will aim to reduce emissions 14 to 19 percent below 2005 levels by 2020. Brazil releases official Amazon deforestation figures for 2009 (11/13/2009) Deforestation in the Brazilian Amazon fell nearly 46 percent to the lowest annual loss on record in 2009, reported the Brazilian government Thursday. Will Brazil's blackout drive a new push for more rainforest dams? (11/12/2009) The power outage that affected nearly a third of Brazil's population Tuesday could be used by development interests to justify a renewed push for hydroelectric dams in the Amazon rainforest. How rainforest shamans treat disease (11/10/2009) Ethnobotanists, people who study the relationship between plants and people, have long documented the extensive use of medicinal plants by indigenous shamans in places around the world, including the Amazon. But few have reported on the actual process by which traditional healers diagnose and treat disease. A new paper, published in the Journal of Ethnobiology and Ethnomedicine, moves beyond the cataloging of plant use to examine the diseases and conditions treated in two indigenous villages deep in the rainforests of Suriname. The research, which based on data on more than 20,000 patient visits to traditional clinics over a four-year period, finds that shamans in the Trio tribe have a complex understanding of disease concepts, one that is comparable to Western medical science. Trio medicine men recognize at least 75 distinct disease conditions—ranging from common ailments like fever [këike] to specific and rare medical conditions like Bell's palsy [ehpijanejan] and distinguish between old (endemic) and new (introduced since contact with the outside world) illnesses. In an interview with mongabay.com, Lead author Christopher Herndon, currently a reproductive medicine physician at the University of California, San Francisco, says the findings are a testament to the under-appreciated healing prowess of indigenous shaman. Disney commits $4 million to rainforest conservation in the Amazon, Congo (11/03/2009) The Walt Disney Company will invest $7 million in forest conservation projects in the U.S., the Congo Basin, and the Amazon in an effort to reduce its greenhouse gas emissions. Google partners with Amazon tribe (10/29/2009) The story of an indigenous Amazon tribe that has embraced technology in its fight to protect its homeland and culture is now highlighted as a layer in Google Earth. Brazil to support REDD in Copenhagen (10/28/2009) Brazil will conditionally support a proposed climate change mitigation scheme that will compensate tropical countries for preserving their forests, reports Reuters. Crisis averted for now, Peruvian natives will meet with Hunt Oil (10/28/2009) Indigenous groups in a dispute with Hunt Oil, over the company performing seismic tests their land, have scheduled a meeting with the Texas based oil corporation, according to Reuters. Will Ecuador's plan to raise money for not drilling oil in the Amazon succeed? (10/27/2009) Ecuador's Yasuni National Park is full of wealth: it is one of the richest places on earth in terms of biodiversity; it is home to the indigenous Waorani people, as well as several uncontacted tribes; and the park's forest and soil provides a massive carbon sink. However, Yasuni National Park also sits on wealth of a different kind: one billion barrels of oil remain locked under the pristine rainforest. Amazonian natives say they will defend tribal lands from Hunt Oil with "their lives" (10/25/2009) Indigenous natives in the Amazon are headed to the town of Salvacion in Peru with a plan to forcibly remove the Texas-based Hunt Oil company from their land as early as today. Peruvian police forces, numbering in the hundreds, are said to be waiting in the town. The crisis has risen over an area known as Lot 76, or the Amarakaeri Communal Reserve. The 400,000 hectare reserve was created in 2002 to protect the flora and fauna of the area, as well as to safeguard watersheds of particular importance to indigenous groups in the region. Brazilian beef giants agree to moratorium on Amazon deforestation (10/07/2009) Four of the world's largest cattle producers and traders have agreed to a moratorium on buying cattle from newly deforested areas in the Amazon rainforest, reports Greenpeace. Will tropical trees survive climate change?, an interview with Kenneth J. Feeley (09/24/2009) One of the most pressing issues in the conservation today is how climate change will affect tropical ecosystems. The short answer is: we don't know. Because of this, more and more scientists are looking at the probable impacts of a warmer world on the Earth's most vibrant and biodiverse ecosystems. Kenneth J. Feeley, tropical ecologist and new professor at Florida International University and the Center for Tropical Plant Conservation at the Fairchild Tropical Botanic Garden, is conducting groundbreaking research in the tropical forests of Peru on the migration of tree species due to climate change. Roads are enablers of rainforest destruction (09/24/2009) Chainsaws, bulldozers, and fires are tools of rainforest destruction, but roads are enablers. Roads link resources to markets, enabling loggers, farmers, ranchers, miners, and land speculators to convert remote forests into economic opportunities. But the ecological cost is high: 95 percent of deforestation in the Brazilian Amazon occurs within 50-kilometers of a road; in Africa, where logging roads are rapidly expanding across the Congo basin, the bulk of bushmeat hunting occurs near roads. In Laos and Sumatra, roads are opening last remnants of intact forests to logging, poaching, and plantation development. But roads also cause subtler impacts, fragmenting habitats, altering microclimates, creating highways for invasive species, blocking movement of wildlife, and claiming animals as roadkill. A new paper, published in Trends in Evolution and Ecology, reviews these and other impacts of roads on rainforests. Its conclusions don't bode well for the future of forests. Working to save the 'living dead' in the Atlantic Forest, an interview with Antonio Rossano Mendes Pontes (09/23/2009) The Atlantic Forest may very well be the most imperiled tropical ecosystem in the world: it is estimated that seven percent (or less) of the original forest remains. Lining the coast of Brazil, what is left of the forest is largely patches and fragments that are hemmed in by metropolises and monocultures. Yet, some areas are worse than others, such as the Pernambuco Endemism Centre, a region in the northeast that has largely been ignored by scientists and conservation efforts. Here, 98 percent of the forest is gone, and 70 percent of what remains are patches measuring less than 10 hectares. Due to this fragmentation all large mammals have gone regionally extinct and the small mammals are described by Antonio Rossano Mendes Pontes, a professor and researcher at the Federal University of Pernambuco, as the 'living dead'. Prince Charles making progress in effort to save rainforests, says leading British environmentalist (09/22/2009) Prince Charles of Great Britain has emerged as one of the world’s highest-profile promoters of a scheme that could finally put an end to destruction of tropical rainforests. The Prince’s Rainforest Project, launched in 2007, is promoting awareness of the role deforestation plays in climate change—it accounts for nearly a fifth of greenhouse gas emissions. The project also publicizes the multitude of benefits tropical forests provide, including maintenance of rainfall, biodiversity, and sustainable livelihoods for millions of people. But the initiative goes beyond merely raising awareness. Prince Charles is using his considerable influence to bring political and business leaders together to devise and support a plan to provide emergency funding to save rainforests. Tony Juniper, one of Britain’s best-known environmentalists and Special Adviser to the project, spoke about Prince Charles' efforts in an interview with mongabay.com. Brazil may ban sugarcane plantations from the Amazon, Pantanal (09/18/2009) Brazil will restrict sugarcane plantations for ethanol production from the Amazon, the Pantanal, and other ecologically-sensitive areas under a plan announced Thursday by President Luiz Inacio Lula da Silva's administration, reports the Associated Press. Heavy oil pollution remains in Amazon, despite company claiming clean-up is finished (09/17/2009) A new report shows that the Corrientes region of the Peruvian Amazon, which suffered decades of toxic contamination by Occidental Petroleum (OXY), is far from being cleaned-up. The survey, conducted by US non-profit E-Tech International, found that heavy metals, volatile organic compounds, and hydrocarbons still exist at levels above the safety limits set by Peru and continue to threaten the Achuar indigenous community, who have long fought against the oil companies. Emissions from cerrado destruction in Brazil equal to emissions from Amazon deforestation (09/15/2009) Damage to Brazil's vast cerrado grassland results in greenhouse gas emissions equivalent to those produced by destruction of the Amazon rainforest, said Carlos Minc, the country's Environment Minister. This article was written by Rhett A. Butler [citation] THE AMAZON RAINFOREST
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