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Tropical Rainforest Adaptations
In sharp contrast, the climate of the tropical rainforest is hot and wet. With over 80 inches of rain per year, as opposed to the desert's 10 inches or less, plants have adaptations that enable them to shed water efficiently. The leaves of many rainforest plants have drip tips for this purpose. Buttress and stilt roots are thought to provide extra support for trees growing in spongy, wet soils.

Tropical rainforest plants also have adaptations to take in what little sunlight is available on the dark forest floor. Large leaves are common; they increase the amount of sunlight a plant can capture. Other plants, like orchids, bromeliads and ferns, grow as epiphytes high up in the canopy where there is more sunlight.

 

 

Types of Rainforests

There are two types of rainforests -- tropical and temperate. Tropical and temperate rainforests share certain characteristics. For example, most trees flare at the base. Vegetation is dense, tall and very green. Both types of rainforests are rich in plant and animal species, although the diversity is greater in the tropical rainforest.

Montane forests are found in mountainous areas and may contain plants such as oaks, rhododendrons, and pines, which are characteristic of temperate deciduous forests. At higher altitudes, temperatures are cooler. Even close to the equator, frost and snow can occur.

Precipitation and Climate
Both tropical and temperate rainforests are very lush and wet. The tropical rainforest has downpours at the rate of two inches an hour adding up to some 400 inches of rain per year. It rains a lot in the temperate rainforest, too -- about 100 inches per year. And even more moisture comes from the coastal fog that hovers among the trees.

Tropical rainforests are warm and moist; while temperate rainforests are cool.

Tropical

Temperate

Temperatures

warm

cool

Number of tree species

many (hundreds)

few (10-20)

Types of leaves

broadleaf

needles

Age of trees

50-100 years

500-1000 years

Epiphytes

lots of different kinds including orchids and bromeliads

mostly mosses and ferns

Decomposition rate

rapid

slow




Are all Tropical Forests, Rainforests?
Only a small percentage of the tropical forests are rainforests. To be a tropical rainforest, forested areas must:

·         Lie between the Tropic of Cancer and the Tropic of Capricorn.

·         Receive rainfall regularly throughout the year (80- 400 inches per year).

·         Remain warm and frost free all year long (mean temperatures are between 70° and 85°F) with very little daily fluctuation.

Consequently, many forested areas in the tropics are not rainforests. Forests that receive irregular rainfall (monsoons followed by a dry season) are moist deciduous forests. Trees in these forests may drop their leaves in the dry season.

 

Where Are Rainforests Located?

Tropical rainforests are located near the equator. Fifty seven percent of all tropical rainforests are found in Latin America. One third of the world's tropical rainforests are in Brazil. Other tropical rainforests are located in Southeast Asia and the Pacific Islands (1/4 of the world's tropical rainforests) and West Africa (9/50).

Temperate rainforests are found along some coasts in temperate zones. The largest temperate rainforests are found on the Pacific coast of North America. They stretch from Oregon to Alaska for 1,200 miles. Smaller temperate rainforests can be found on the southeast coast of Chile in South America. There are a few other coastal strips with temperate rainforests, including small areas in the United Kingdom, Norway, Japan, New Zealand, and southern Australia.

 

http://mbgnet.mobot.org/sets/rforest/index.htm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


A map of the Tropical Rainforests in the world

 

The Disappearing Rainforests

·        We are losing Earth's greatest biological treasures just as we are beginning to appreciate their true value. Rainforests once covered 14% of the earth's land surface; now they cover a mere 6% and experts estimate that the last remaining rainforests could be consumed in less than 40 years

·        One and one-half acres of rainforest are lost every second with tragic consequences for both developing and industrial countries.

·        Rainforests are being destroyed because the value of rainforest land is percieved as only the value of its timber by short-sighted governments, multi-national logging companies, and land owners.

·        Nearly half of the world's species of plants, animals and microoganisms will be destroyed or severely threatened over the next quarter century due to Rainforest deforestation.

·        Experts estimates that we are losing 137 plant, animal and insect species every single day due to rainforest deforestation. That equates to 50,000 species a year. As the rainforest species dissapear, so do many possible cures for life-threatening diseases. Currently, 121 prescription drugs sold worldwide come from plant-derived sources. While 25% of Western pharmaceuticals are derived from rainforest ingredients, less that 1% of these tropical trees and plants have been tested by scientists.

·        Most rainforests are cleared by chainsaws, bulldozers and fires for its timber value and then are followed by farming and ranching operations, even by world giants like Mitsubishi Corporation, Gerogia Pacific, Texaco and Unocal.

·        There were an estimated ten million Indians living in the Amazonian Rainforest five centuries ago. Today there are less than 200,000.

·        In Brazil alone, European colonists have destroyed more than 90 indigenous tribes since the 1900's. With them have gone centuries of accumulated knowledge of the medicinal value of rainforest species. As their homelands continue to be destoyed by deforestation, rainforest peoples are also dissappearing.

·        Most medicine men and shamans remaining in the Rainforests today are 70 years old or more. Each time a Rainforest medicine man dies, it is as if a library has burned down.

·        When a medicine man dies without passing his arts on to the next generation, the tribe and the world loses thousands of years of irreplaceable knowledge about medicinal plants.

The Wealth of the Rainforests

·        The Amazonian Rainforest covers over a billion acres, encompassing areas in Brazil, Venezuela, Columbia and the Eastern Andean region of Ecuador and Peru. If Amazonia were a country, it would be the ninth largest in the world.

·        The Amazon Rainforest has been described as the "Lungs of our Planet" because it provides the essential environmental world service of continuously recyling carbon dioxide into oxygen. More than 20 percent of the world oxygen is produced in the Amazon Rainforest.

·        More than half of the world's estimated 10 million species of plants, animals and insects live in the tropical rainforests. One-fifth of the world's fresh water is in the Amazon Basin.

·        One hectare (2.47 acres) may contain over 750 types of trees and 1500 species of higher plants.

·        At least 80% of the developed world's diet originated in the tropical rainforest. Its bountiful gifts to the world include fruits like avocados, coconuts, figs, oranges, lemons, grapefuit, bananas, guavas, pinapples, mangos and tomatoes; vegetables including corn, potatoes, rice, winter squash and yams; spices like black pepper, cayenne, chocolate, cinnamon, cloves, ginger, sugar cane, tumeric, coffee and vanilla and nuts including Brazil nuts and cashews.

·        At least 3000 fruits are found in the rainforests; of these only 200 are now in use in the Western World. The Indians of the rainforest use over 2,000.

·        Rainforest plants are rich in secondary metabolites, particularly alkaloids. Biochemists believe alkaloids protect plants from disease and insect attacks.Many alkaloids from higher plants have proven to be of medicinal value and benefit.

·        Currently, 121 prescription drugs currently sold worldwide come from plant-derived sources. And while 25% of Western pharmaceuticals are derived from rainforest ingredients, less than 1% of these tropical trees and plants have been tested by scientists.

·        The U.S. National Cancer Institute has identified 3000 plants that are active against cancer cells. 70% of these plants are found in the rainforest. Twenty-five percent of the active ingredients in today's cancer-fighting drugs come from organisms found only in the rainforest

·        Vincristine, extracted from the rainforest plant, Periwinkle, is one of the world's most powerful anticancer drugs. It has dramatically increased the survival rate for acute childhood leukemia since its discovery.

·        In 1983, there were no U.S. pharmaceutical manufacturers involved in research programs to discover new drugs or cures from plants. Today, over 100 pharmaceutical companies and several branches of the US government, including giants like Merck and The National Cancer Institute, are engaged in plant research projects for possible drugs and cures for viruses, infections, cancer and even AIDS.

Rainforest Action

·        Experts agree that by leaving the rainforests intact and harvesting it's many nuts, fruits, oil-producing plants, and medicinal plants, the rainforest has more economic value than if they were cut down to make grazing land for cattle or for timber..

·        The latest statistics show that rainforest land converted to cattle operations yields the land owner $60 per acre and if timber is harvested, the land is worth $400 per acre. However, if these renewable and sustainable resources are harvested, the land will yield the land owner $2,400 per acre.

·        If managed properly, the rainforest can provide the world's need for these natural resources on a perpetual basis.

·        Promoting the use of these sustainable and renewable sources could stop the destruction of the Rainforests. By creating a new source of income harvesting the medicinal plants, fruits nuts, oil and other sustainable resources, the rainforests is be more valuable alive than cut and burned.

·        Sufficient demand of sustainable and ecologically havested Rainforest products is necessary for preservation efforts to succeed. Purchasing sustainable rainforest products can effect positive change by creating a market for these products while supporting the native people's economy and provides the economic solution and alternative to cutting the forest just for the value of its timber.





 

The Destruction of the Majestic Rainforest

The beauty, majesty and timelessness of a primary rainforest is indescribable. It is impossible to capture on film, to describe in words or to explain to those who have never had the awe-inspiring experience of standing in the heart of a primary rainforest. Rainforests have evolved over millions of years to turn into the incredibly complex environments they are today. A rainforest represents a store of living and breathing renewable natural resources, which have for eons, by virtue of their richness in both animal and plant species, contributed a wealth of resources for the survival and well-being of man. These have included basic food supplies, clothing, shelter, fuel, spices, industrial raw materials and medicine for all those that have lived sustainably in the majesty of the forest. However, the inner dynamics of a tropical rainforest are an intricate and fragile system where everything is so interdependent that upsetting one part can lead to unknown damage or even destruction of the whole. Sadly, it has taken only a century of man's intervention to destroy what nature has so intricately designed to last forever.

In 1950, 15% of the earth's land surface was covered by rainforest. Today, more than half has already gone up in smoke. A century ago, half of India and a third of Ethiopia were covered by forest, now only fourteen percent in India remains and only one-third is left in Ethiopia. Eight out of ten trees in Ghana have been cut down. Three quarters of the trees of the Ivory Coast are gone. More than twenty percent of the Amazon Rainforest is already gone and much more is severely threatened as destruction continues to escalate. Statistics reported in 1996 reported the Amazon showed a 34 percent increase in deforestation since 1992. A new report by a congressional committee says the Amazon is vanishing at a rate of 20,000 square miles a year. That's more than three times the rate of 1994, the last year for which official figures are available. "If nothing is done, the entire Amazon will be gone within 50 years," said the 110-page report's author, Rep. Gilney Vianna of the leftist Worker's Party in the Amazon state of Mato Grosso. Yet another recent report said new figures showed that in the Brazilian Amazon, forest fires increased by more than 50 percent over 1996.

In less than 50 years, more than half of the world's tropical rainforests have fallen victim to fire and the chain saw and the rate of destruction is still accelerating. Unbelievably, over 200,000 acres of rainforest are burned every day. That is over 150 acres lost every minute of every day, and 78 million acres are lost every year! More tropical forest burned around the world in 1997 than at any other time in recorded history, a report by the World Wide Fund for Nature. The fund said "1997 will be remembered as the year the world caught fire," said Jean-Paul Jeanrenaud, head of its forest program.

Massive deforestation brings with it many ugly consequences - air and water pollution, soil erosion, malaria epidemics, the release of carbon dioxide into the atmosphere, the eviction and decimation of Indigenous Indian tribes, and the loss of biodiversity through extinction of plants and animals. Less Rainforests means less rain, less oxygen for us to breathe, and an even greater threat from global warming.

But who is really to blame? Consider what we industrialized Americans have done to our own homeland... we converted ninety percent of North America's virgin forests into firewood, shingles, furniture, railroad ties and paper. Other industrialized countries have done no better. Malaysia, Indonesia and Brazil, among other tropical countries with rainforests, are often branded as "environmental villains" of the world, mainly due to their reported levels of destruction of their rainforests. But despite the levels of deforestation, they are still covered by up to 60% of their territory by natural tropical forests. In fact, much of the pressure today on their remaining rainforests come from servicing the needs and markets for wood products in industrialized countries who have already depleted their own natural resources. Industrial countries would not be buying rainforest hardwoods and timber had we not cut down our own trees long ago nor would poachers in the Amazon jungle be slaughtering jaguar, ocelot, caiman and otter if we did not provide lucrative markets for their skins in Berlin, Paris and Tokyo.

Tropical Rainforest Animals

Life inside the wet and bustling tropical rainforest is filled with danger. Cougars and pumas stand ready to pounce; snakes sliver unseen between feet to administer a lethal bite; while exotic birds chirp overhead. An animal must be both smart and strong to survive in this environment. The intense competition from other species makes rainforest species the most interesting.

The rainforests of the world are being destroyed by loggers and development. Many species found in the rainforest are endangered. Once they disappear, they are gone forever!

 

 

 

We will be classifying Rainforest Animals into 3 Groups.

1.     Endangered Animals

2.     Extinction

3.     Abundant

 

 

In Endangered Animals, we can classify the Orangutan, Gorrila and many other spieces of animals.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


In Extinction, we can classify these animals.

 

In Abundant, there are a lot of animals in the rainforest. But because of Man’s activities, these animals will soon join the Endangered animals section or even the Extinct section. For example the Dodo which lived hundred’ of years ago were killed so often that they became extinct.

 

P.S If you cannot see the pictures, please call me, I shall e-mail it you. By the way I shall check my e-mail at 11.10, write all your suggestions by then in e-mail, and sent it to me at darthmaulempire@msn.com

Gautham