Amazon Basin
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The Amazon Basin is the part of South America drained by the Amazon River and its tributaries that drains an area of about 6,915,000 square kilometres (2,670,000 sq mi), or roughly 40 percent of South America. The basin is located in the countries of Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela [1]. The Amazon rain forest is the largest in the world, covering about 8,235,430 km2 (3,179,720 sq mi) with dense tropical forest.
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[edit] Plant life
As much of the Amazon is unexplored, many of its indigenous plants and animals are unknown. Plant growth is dense and the variety of animals living is comparatively more because of the heavy rainfall and the dense forests covered with huge evergreen and coniferous forests. The forests are in fact so thick that the dense "roof" created by the leaves and branches does not allow the sunlight to reach the ground. The ground remains dark and damp. Only shade tolerant trees and vegetation may grow here. Orchids and bromeliads use trees and other plants to get closer to the sunlight. They grow hanging onto the branches or tree trunks with aerial roots, not as parasites but as epiphytes. One tropical fruit tree that is native to the Amazon is the abiu. There are thousands of plants, all in different colors, sizes, and shapes. There are also many other living organisms that have their homes in these plants.
[edit] Animal life
Mammals.
Birds.
Reptiles and amphibians.
Fishes. With more than 2,200 species the Amazon Basin has a larger fish fauna than any other river basin on Earth, and Amazonia is the center of diversity for Neotropical fishes (Albert and Reis, 2011)[2].
Some of the major fish groups of the Amazon Basin include:
- Order Gymnotiformes: Neotropical electric fishes
- Family Characidae: tetras and allies
- Family Loricariidae: armoured catfishes
- Subfamily Cichlinae: Neotropical cichlids
- Subfamily Poeciliinae: guppies and relatives
[edit] Climate and seasons
The Amazon river Basin has a tropical rainforest climate. Annual rain fall is approximately 1500–2500 mm.[citation needed] Day temperatures typically reach 30–35°C, while night temperatures reach 15–25°C.
The climate consists of two seasons, a "dry" or low-water season, and a wet season during which the rivers flood adjacent low lying forests.
[edit] Human occupation
Amazonia is very sparsely populated. There are scattered settlements inland, but most of the population lives in a few larger cities on the banks of the Amazon and other major rivers, such as in Iquitos (Peru), Manaus and Belém (Brazil). In many regions, the forest has been cleared for soy bean plantations and ranching (the most extensive non-forest use of the land) and some of the inhabitants harvest wild rubber latex and Brazil nuts. This is a form of extractive farms, where the trees are not cut down, and thus this is a relatively sustainable human impact.
The largest organization fighting for the indigenous peoples in this area is COICA, which is a supraorganization emcompassing all indigenous rights organizations working in the Amazon Basin area, living in several countries.
[edit] River commerce
The river is the principle path of transportation for people and produce in the regions, with transport ranging from balsa rafts and dugout canoes to hand built wooden rivercraft and modern steel hulled craft.
[edit] Sustainable opportunistic agriculture in undeveloped areas
Seasonal floods excavate and redistribute nutrient-rich silt onto beaches and islands, enabling dry-season riverside agriculture of rice, beans, and corn on the river's shoreline without the addition of fertilizer, with additional slash and burn agriculture on higher floodplains. Fishing provides additional food year round, and free-range chickens need little or no food beyond what they can forage locally. Charcoal made largely from forest and shoreline deadfall is produced for use in urban areas. Exploitation of bush meat, particularly deer and turtles is common.
[edit] Non-sustainable agriculture in developed areas
Extensive deforestation, particularly in Brazil, is of considerable worldwide concern as it is leading to the extinction of known and unknown species, reducing biological diversity and negatively impacting soil, water, and air quality. A final part of the deforestation process is the large-scale production of charcoal for industrial processes such as steel manufacturing. Soils within the region are generally shallow and cannot be used for more than a few seasons without the addition of imported fertilizers.
[edit] Geography
The Amazon Basin is bounded by the Guiana Highlands to the north and the Brazilian Highlands to the south. The Amazon, which rises in the Andes Mountains at the west of the basin, is the second longest river in the world. It covers a distance of about 6,400 km before draining into the Atlantic Ocean. The Amazon and its tributaries form the largest volume of water. The Amazon accounts for about 20% of the total water carried to the oceans by rivers. Some of the Amazon Rainforest is deforested because of a growing interest in hardwood products.
The highest point in the watershed of the Amazon is the peak of Yerupajá at 6,635 m (21,768 ft).
Politically the basin is divided into the Brazilian Amazônia Legal, the Peruvian Amazon, the Amazon Region of Colombia and parts of Bolivia, Ecuador and the Venezuelan state of Amazonas.
[edit] Languages
The most widely spoken language in the Amazon is Portuguese, followed closely by Spanish. On the Brazil side Portuguese is spoken by at least 98% of the population, whilst in the Spanish-speaking countries a large number of speakers of indigenous languages are present, though Spanish is predominate.
There are hundreds of native languages still spoken in the Amazon, most of which are spoken by only a handful of people, and thus are critically endangered. One of the most widely spoken languages in the Amazon is Nheengatu, which is descended from the ancient Tupi language, originally spoken in the coastal and central regions of Brazil. It was brought to its present location along the Rio Negro by Brazilian colonizers who, until the mid-17th century, who primarily used Tupi rather than the official Portuguese to communicate. Besides modern Nheengatu, other languages of the Tupi family are spoken there, along with other language families like Jê (with its important sub-branch Jayapura spoken in the Xingu River region and othes), Arawak, Karib, Arawá, Yanomamo, Matsés and others.
[edit] See also
[edit] References
- ^ The Smithsonian Atlas of the Amazon, Goulding, M., R.B. Barthem, and R. Duenas, 2003. Smithsonian Books|Goulding et al., (2003)
- ^ James S. Albert; Roberto E. Reis (8 March 2011). Historical Biogeography of Neotropical Freshwater Fishes. University of California Press. p. 308. ISBN 9780520268685. http://books.google.com/books?id=_Suu7a-ERdMC&pg=PA308#v=onepage&q=paraspecies&f=false. Retrieved 28 June 2011.
[edit] Further reading
- Dematteis, Lou; Szymczak, Kayana (June 2008). Crude Reflections/Cruda Realidad: Oil, Ruin and Resistance in the Amazon Rainforest. City Lights Publishers. ISBN 9780872864726.
[edit] External links
- Bibliography on Water Resources and International Law Peace Palace Library
- Information and a map of the Amazon's watershed
- Amazon biogeography (French, English, Spanish)
- Herndon and Gibbon Lieutenants United States Navy The First North American Explorers of the Amazon Valley, by Historian Normand E. Klare. Actual Reports from the explorers are compared with present Amazon Basin conditions.
- Scientists find Evidence Discrediting Theory Amazon was Virtually Unlivable by The Washington Post
