The Ecology Of A Rain Forest


The Ecology Of A Rain Forest Essay, Research Paper

In 1980, the estimated amount of rain forests in the world was 40,000 square miles. This number decreases each

year by roughly 1,000 square miles due to construction and the resources being used for profit. It is too bad, because

the rain forest is one of the most beautiful places on earth. It is the most diverse, containing the most species of

living things, much more than anywhere else, and most have yet to be identified. All rain forests are located on

earth’s “green belt”, that is, the area roughly around the equator that covers all the area from Mexico and the

northern area of South America, to Africa, to India, stretching out to Indonesia, the northern tip of Australia and all

the way to New Guinea. This area is heavily covered with flora and fauna,

and it abounds with life. In a rain forest, it is very wet and it rains everyday or every other day very heavily. There is

a high and steady level of heat and moisture. There are some general layers to the rain forest. It starts

135 feet up in the air, with the lofty crowns of the tallest trees in the jungle. They take the most light, heat, rain and

the most punishment from the winds. Woodpeckers hunt insects in this layer, and also the black and white

Colobus monkey can be found here, ready to launch into the air, using his specially developed tail as a rudder to

guide his flight. Beneath this is the second layer of trees, whose crowns form a forest canopy. Rain filters

through this canopy, and the top sides of the crowns hold a large amount of ferns and other small plants whose roots

never touch soil. They live off the water and nutrients held in the small pockets of the leaves and branches. Tree

frogs and chimpanzees live here, burrowing holes to live in the vast vegetation. The third layer is called the

“understory”. This grows beneath the canopy. The gorilla makes this his regular hangout, also pythons lie here

waiting for prey. The dim forest floor teems with life. Termites and ants feed on all the decomposing matter on the

ground, and elephants make their way down a path of moss. Butterflies move silently by, and the air is still and very

humid. These are the layers that make up the rain forest’s complex

ecology. In the rest of the essay I will describe some of the life forms found in the rain forest, and ways they affect

the environment. In the rain forest, plants develop poisonous alkaloids to protect against insects, and insects develop

complex digestive chemistry to overcome these poisons. Some of these plant alkaloids give native Indians great

poisons for darts, and to cancer researchers hope for a new medicine. The rain forest root systems are so efficient

that almost all of the nutrients in decaying plants are recycled into new ones. Most roots are found within three

inches of the surface in heavy clay or at the surface in sandy soils. Tiny rootlets grow up and attach themselves to

leaves. When the leaf decays, minuscule fungi on the rootlets take over and send threadlike projections into the leaf

which absorbs all of the leaf’s nutrient material. The phosphorous that the fungi produces is taken by the root, and in

turn gives the fungus sugars from the tree. Al!

so, termites and ants break down the forest litter.


In a small lake in the middle of the rain forest, a small lizard skims across the water away from dangerous prey and

attacks its own victim by surprise, yet another marvel of the tropical rain forest. Mutualism occurs in the jungle with

a specialized ant and a swollen-thorn acacia. The acacia provides budlike leaflet tips which are called Beltian bodies,

which the ants give to their young for food. The insects hollow out the tree’s thorns when soft and green and raise

their young inside. The acacia doesn’t have chemical defenses to repel dangerous and damaging insects and demands

pure sunlight for proper growth. The ants patrol the tree day and night. If any insect lands on the tree, they bite it

with a poisonous sting. They also attack plants that grow onto the tree, such as a vine. In this case, they would attack

the vine at it’s base and pull it off the tree. There are also small leaf-cutting ants in the jungle that cut a portion of a

leaf, bring it to their home,!

and chew it to a pulp and inject a body fluid to create a wet mulch. On this mulch grows the only food of this

particular ant — a fungus that has only one species. The mysterious part about this is that any spores that could

develop on the mulch and contaminate it don’t develop. Paper wasps in the rain forest have to bail out their home

after a heavy shower. They lap up a mouthful of water from the colony, and then spit it out onto the forest floor.

They also coat the small stalk that attaches the nest to the branch of a tree with a sticky black secretion that repels

some ants. But there are still some predators, such as jungle katydids which eat the leaves, and some species of ants

that are not repelled by the black secretion. In one rain forest, there is a kind of toad that is voiceless. So for the male

to attract a mate, nature gave it a very noticeable characteristic — a fluorescent orange color, which is unmistakable.

The females are blackish green with scarle!

t spots on them.

In April and May, mating takes place. Where pools are formed on the forest floor by water

trickling down trees, females lay around 200 eggs. After the males fertilize them, the embryos live in their aquatic

world for about two weeks, then after that they hatch and mature. This species was discovered in 1964 and it helped

win government protection for Monteverde, which is the place where these frogs can be found. Biologist Jay M.

Savage, amazed by the frogs, once wrote “I must confess. . .my. . .disbelief and suspicion that someone had dipped

the examples in enamel paint.” There are other species of frogs, such as the green leaf

frog, whose green body and glowing red eyes is an incredible sight. They extrude and fertilize their eggs on a leaf

over water. Young that are ready to leave their embryo drop into the water below. Also the poison-arrow frog is an

interesting variety. The males battle for dominance and mates. Two can struggle for hours until one give up and

croaks “uncle”. Their color warns predators of their composition which could prove toxic for snakes and other such

beasts. The Dendrobates Granuliferus frog doesn’t have young that develop in water. Instead, the tadpoles cling to

the mother’s wet back. She transports them this way from place to place, usually depositing them in a cup of

rainwater in a high branch safe from predators. She immerses herself in the water at first until the young let go of her

body and swim into the water.


A rare bird found only in rain forests, the quetzal, is a beautiful sight. They have long colorful tails which have long

been worn by royalty of the Colombian Indians, who called the birds sacred. It is beautiful animals like these that

might start spur nations into preserving more of their rain forests, in hopes of keeping one of the most complex and

interesting ecologies on earth.

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