Tropical Rainforests
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A dense forest that gets lots of rainfall throughout the year. There are two types of rainforests: tropical rainforests and temperate rainforests.
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Warm, humid climate that experiences rain all year round.
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Climate is the long-term weather pattern in a region, typically averaged over 30 years.
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Weather is the state of the atmosphere, including temperature, wind, humidity, precipitation, and cloud cover. Weather is constantly changing.
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The imaginary line that humans use to divide the world into the northern and southern hemisphere.
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The major line of latitude north of the Equator. It can be found at 23.5 degrees north.
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The major line of latitude south of the Equator. It can be found at 23.5 degrees south.
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A graph that shows the average temperature and rainfall per month of a specific region. Typically temperature is displayed as a red line chart and rainfall as a blue bar chart.
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Found at ground level in tropical rainforests. The shurb layer is typically dark and gloomy. It does not normally have a large amount of vegetation due to the lack of sunlight it receives.
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This is the second layer of tropical rainforests. There is still limited light that makes it through to this layer. This layer typically hosts plants waiting to grow and climbing plants and animals.
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The canopy is sometimes called the roof of the rainforest, this is because this is the layer where most trees stop growing. It is typically 20 to 40 meters tall. This layers hosts lots of insects, birds and even some mammals.
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This layer is made up of the tops of the tallest trees. Some examples of these trees are teak trees and Mahogany trees. Typically only large birds are found in this layer.
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Large wide roots that appear all around tall trees that help keep them steady and supported. These are normally found on trees growing in tropical rainforests due to the poor nutrient quality of the soil.
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An elongated leaf tip from which excess water drips off, as found in plants of the rainforest.
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These are plants with long, flexible, climbing stems that are rooted in the ground, and usually have long dangling branches. Some people refer to them as vines.
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Plants that typically grow on other plants and trees for physical support and to have better access to sunlight.
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A species of fig plant that grows up other trees and plants suffocating them and potentially killing the host vegetation.
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a modification of an organism to be more suited to the environment it lives in. For example a monkey having a tail for balance when living in trees.
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Adaptations to how animals act or think. For example becoming nocturnal.
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Changes to the animal or plants physical structure. For example, growing a long tail for balance.
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A group of people who live together, share the same language, culture and history and stay outside towns or cities.
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The act of cutting down trees. Normally on a large scale.
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The industry of collecting wood from trees.
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electricity being created by converting the movement of water (normally though a dam) into energy by using the water to turn turbines.
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When a species of plant or animal no longer exists. When there is not a single living member of the species alive.
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A gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.
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Meeting the needs of today without sacrificing the resources of tomorrow.
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responsible travel to tourist destinations that promotes learning, environmentally friendly interactions and help local communities.
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A method of farming that involves clearing areas by burning them before planting more seeds. Commonly used in forest areas.
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Where are Tropical Rainforests?
Tropical rainforests are located in the worlds tropical regions. They are found between the Tropic of Cancer and the Tropic of Capricorn. The majority of the worlds tropical rainforests are located around the Equator. The Amazon Rainforest (the worlds largest tropical rainforest) is located in the north of South America. Tropical rainforests are found in the continents of North America, South America, Africa, Asia and Oceania.
What is the climate like?
Fan Palm
Fan palms are wide fan shaped leaves that cover a large surface area, this makes them great at catching sunlight. Due to the V-shape of each individual leaf they are great at catching water and funneling it to the ground around the plant. The leaves are segmented, this means that they do not collect too much water.
Tropical rainforests do not have a wet and a dry season. Tropical rainforests do not have summer or winter. The temperature remains very similar all year round. Every month in a tropical rainforest climate is wet. Rainfall is almost daily.
What are the typical characteristics of tropical rainforests?
Epiphytes
Epiphytes are also known as parasitic plants, they get their name because they are plants that live on trees. This adaptation of living on trees allows the plants to overcome the darkness of the shrub layer and take advantage of the extra light found in the canopy and understory layers.
Lianas
Lianas are more commonly known as vines. However, Lianas start at ground level and a firmly planted in the ground. Lianas grow up other vegetation such as trees in an attempt to gather as much sunlight as possible.
Ferns
Ferns are unique as they have a set of special adaptations that make them more suited to living on the forest floor where there is little sunlight. They are incredibly effective with the little sunlight they receive. Some ferns have even developed symbiotic relationships with other plant life to help them gather more water in exchange for extra sugars.
Crab Spider
Crab spiders have a behavioral adaptation. They no longer build webs, this is because it is too hard to maintain a web in a rainforest. Instead they have become ambush predators. This means they use their camouflage to sneak up on their prey and then pounce on them. Some species of crab spider can even change their colour to match their surroundings.
Blossom Bat
Blossom bats have developed a unique method of feeding on plant nectar and pollen.
If there is not enough food blossom bats have been known to go into hibernation to conserve energy so that they do not starve during times of food shortage.
Strangler Figs
Strangler figs grow from the top of the tree eventually reaching the ground and taking root. Their roots wrap around the host tree and their branches reach out taller than the host tree blocking the sunlight from reaching the host tree. They eventually cover so much of the host tree that it dies.
Drip Tip Leaves
Drip tip leaves come in countless varieties. All of them allow water to flow off of them stopping them from being damaged by excess water from heavy rainfall. Some have spikey edges that help to stop animals from eating them. Most also have a thick waxy surface that helps keep water in the plant and for excess water to run off the leaf.
Pangolin
Pangolins have evolved a very special defensive measure to protect themselves form potential harm. They curl into a tight ball and their protective scales form a hard armor like layer on their outside.
Pangolins also have very sensitive noses that allow them to smell ants from very far away.
Pangolins also have hard and sharp claws that help them to dig through very though ground.
Gecko
Some geckos have developed very unique skin colours that help them match to their surroundings. Some look like leaves or dirt and some look like tree bark.
Geckos also have developed large eyes that are great for seeing in low levels of light. They also have vertical pupils that help protect their eyes from sunlight.
Geckos also have toe pads covered in thin hairs that help them stick to different surfaces, this is very useful for climbing.
Plant Adaptations
Tropical rainforests can typically be divided into 4 layers. The Shrub layer, the understory, the canopy and the emergent layer. Each layer has its own unique characteristics and features.
The emergent layer: The tallest of the layers and normally contain the tips of the tallest trees.
The canopy layer: The second tallest of the layers. This layer blocks the majority of sunlight as it it normally the thickest of the layers as it contains the majority of the tops of trees.
The understory layer: This layer is just below the tops of the trees.
The shrub layer: this layer contains the initial first few meters above the forest floor and the floor itself. This layer receives the least sunlight. This means that the nutrient content of the soil here is very low.
Monkey
Some species of monkey have prehensile tails, this means their tails can be used for grasping branches and other surfaces so that they can hang without using their hands or feet.
Monkeys have also developed long strong arms that allow they to climb and swing around trees with ease.
Some monkeys have also evolved to live in family units so that they can hunt together and to also protect each other from larger predators such as jaguars.
Buttress Roots
Buttress roots are large thick roots that help anchor large trees to the ground and stop them from falling over The roots are also shallow, this allows the roots to absorb more water and nutrients in the poor quality soil that they are normally found in.
Lemur
Unlike some species of monkeys, lemur tails are not for grasping things. Lemur tails are simply for providing balance or in some cases for signaling to other animals.
Lemurs have very strong grasping fingers and toes these help them to climb trees and to open certain foods.
Lemurs have also changed in the way they act. Most groups of lemurs will groom each other to keep each other health and clean,
Animal Adaptations
Humans and Tropical Rainforests
While most of the people in the world are working daily jobs, going to school, shopping at supermarkets and trying to not get stuck in traffic on the way to do these things, some people are not doing any of these things. These people can normally be found in the most rural and wild parts of our planet, tropical rainforests.
These groups of people are often referred to as tribes. A tribe is a community of people linked by race, religion, language or customs. Quite often tribes share the same ancestral lineage, this means they have share relatives from a very long time ago.
The number of tribes globally is decreasing as more and more tribes are leaving their homelands and embracing a more modern way of life.
Kayapo People
The Kayapo people are native to South America, more specifically the south of the Amazon Basin in Brazil. Kayapo is the name that the rest of the world has given to this group of people, this is not the name they give to themselves.
The Kayapo people use black body paint as a way of mimicking their ancestors and to also help them when hunting by acting as a form of camouflage. It is a long held tradition for the older men of the tribe to implement a disk into their lower lip. This is now less common in the newer generations of the tribe. Due to the increasing interactions with modern society it is now very common to see Kayapo people wearing modern clothing and less traditional clothing.
The Kayapo people have been under threat in recent years due to the every growing mining and logging operations that are happening in their regions of the Amazon Basin.
What is Deforestation?
Deforestation is the intentional clearing of forested land by cutting down trees.
People have been chopping down trees for as long as we have existed on planet Earth. We do this for a huge variety of reasons, ranging from collecting fire wood to feeding a growing population of a country.
Deforestation is constantly in the headlines of the global media due to the negative impacts it has on our environment and atmosphere.
Causes of Deforestation
Logging
This is the process of chopping down and processing trees to collect wood to be sold to other countries (normally more developed countries). Not all trees are sought after, this means that quite a large amount of trees are cut down just to get to the trees that are wanted.
Road Building
Industries such as logging and mining require access to bring in machinery and to take out the resources they extract this means roads are built that also requires the clearing of forest. These roads form barriers throughout tropical rainforests that heavily disrupt the local wildlife.
Cattle Ranching/farming
Trees are often cut down to clear the way for agricultural farming or for the raising of animals such as cows. This is often done with a method called slash and burn.
Fuelwood
Many local communities (especially in less economically developed nations) rely of the harvesting and burning of wood to create fire. Fire is needed for heat and cooking.
Impacts of Deforestation
Mining
Land is cleared completely of all trees and soil and normally treated with chemicals. This process not only causes the loss of trees but also leaves the land and area around it scared and unusable for replanting trees afterwards.
Building Dams
Dams are often built in tropical rainforests as they require a large area of land to be flooded and it makes more sense to flood uninhabited land than urban areas and having to rehouse people.
Sustainability and Tropical Rainforests
Restoring cleared areas/Afforestation:
Farmers, families and some organisations have started using the cleared areas of forest in in sustainable ways, such as:
Planting new crops to feed families and local communities
Planting trees and crops in combination to allow areas of forest to regrow
Planting larger hardwood trees as these are the types of trees that are targeted in large scale logging campaigns.
Sustainable Logging:
Instead of stopping logging all together, logging can be conducted in more sustainable ways. If logging is made illegal this will simply create an illegal logging industry and cause conflict. Some of the more sustainable approaches to logging are:
Having designated logging areas so that the process can be monitored and controlled
Introducing laws that make it illegal to harvest all of the trees within a given area
Introducing a replanting scheme in which an equal number of trees must be planted for the number chopped down.
Trees must be of a certain age before they can be chopped down, this allows trees to grow and reach maturity.
Sustainable Tourism:
Attracting tourists to areas that have experienced deforestation, this is a great method of educating people about the dangers of deforestation and can also bring money to communities and organisations that fight against this process. Sustainable tourism is also a fantastic way of allowing people to engage with the wildlife that is being directly effected by deforestation, highlighting why they should be protected.
Sustainable Management:
It is very difficult to monitor what is happening in tropical rainforests as they are so big and widespread. Certain measure can be put into place to make sure logging and other processes that require deforestation is happening in a more sustainable way, some of these are:
Tracking deforestation with satellite imagery
Sub-dividing regions into smaller more manageable zones
Making sure that there are sufficient roads so that industries and farmers do not make their own.