The Rainforest

Biotic: Living Factors in an Ecosystem

Animals                               Plants

Sloths                             Rubber Trees                                                                            

Anteaters                        Bamboo Trees

Poison Dart Frogs







Praying Mantis

Leafcutter Ants

Howler Monkeys


Coral Snakes

Abiotic: Nonliving Factors in an Ecosystem

a lot of water

warm temperatures

a lot of sunlight

soil nutrients


Carrying Capacity in the Rainforest

The largest number of individuals of one species that an environment can support. The resources that populations need to survive are food, water, shelter, and space.

One population that lives in the rainforest is toucans. the population of toucans is constantly changing, if one of their resources aren't available then their population will decrease. Another reason why populations decrease is limiting factors. For example, a drought or flood. Populations increase when there are enough resources to provide for all of the organisms in the population.

Limiting Factors in the Rainforest

Any factor or condition that limits the growth of a population in an ecosystem.




too much or too little sunlight

tropical storms

Predator/Prey Relationships

An anteater and ants are an example of a predator/prey relationship. The anteaters are carnivores and eat the ants which are herbivores. An example of a limiting factor affecting them is if the rainforest was experiencing a lack of sunlight. This would cause the plants to decrease which would indirectly cause the ants to decrease which would eventually cause the anteaters to suffer.

Energy Roles

Organisms in the Rainforest




Top carnivore.............................Hawk


All organisms gain their energy from the level BELOW them!!!!!!!!!!

In the ecosystem the sun is the source of all the energy. the plants, being autotrophs, are important to the ecosystem because the are the only organisms that can transform the sun's thermal energy into chemical energy. The other consumers in the ecosystem later transform that energy into mechanical energy and that mechanical energy later turns back into thermal energy.

Food Chains and Food Webs

Food webs are more realistic than food chains because they show more possibilities.

If I removed the jaguar population from this food web then the agouti, golden lion tamarin, and the tair populations would grow because there will no longer be any predators hunting them. this would eventually cause the boa constrictor population to decrease because their predators have suddenly increased. In other words if the jaguar population was eliminated this ecosystem would be way out of balance.

Trophic Levels and Energy Pyramids

The energy pyramid is in the shape of pyramid to show that less and less energy is transferred throughout the levels of the pyramid.

The producer level is the biggest because it gets all of its energy from the sun and has more energy than all other organisms.


Chemical Formulas

Carbon dioxide.......CO2





Light,carbon dioxide,and water are the three things that plants need to produce photosynthesis. Photosynthesis produces glucose and oxygen. Photosynthesis takes place in the plant's leaves. During photosynthesis, the sun's radiant energy gets transformed into chemical energy.


Turning or bending movement of an organism toward or away from an external stimulus, such as light, heat, or gravity

An example of tropism is when a plant grows in the direction of the light.

The different types of tropisms:

Geotropism- gravity causes a response in a plants growth/ both positive and negative

Hydrotropisms- The way a plant grows or bends in response to water/ mostly positive.

Thigmotropisms- Plants bend or grow because of touch/ both positive and negative.

Phototropisms- The way a plant grows or bends in response to light/ mostly positive.

Tropism helps plants by letting them receive all of their resources needed for survival.


Decomposers are important to our environment because they break down materials in an ecosystem and release organic compounds to be used by plants. If there weren't decomposers our world would be filled with waste and plants would not get the nutrients they need to grow.

Some examples of decomposers in the rainforest are: termites, velvet worms, leaf beetles, partula snails, and fungi.


Adaptations are important to organisms because they help them to survive in their ecosystem. An example of an organism using its adaptations in the rainforest is a chameleon. A chameleon uses its camouflage to blend into its surroundings and to avoid predators.

More Examples

1. Since tropical rainforests receive 160 to 400 inches of rainfall per year, most leaves of trees have pointed tips and are very slippery.

2.Lianas are thick, twisted vines which loop around tree trunks to reach the sunlight.This helps, because it speeds up the process of getting to the sunlight, as it is constantly moving from tree to tree while they are growing. This adaptation helps them to achieve more sunlight and grow better.

3.Epiphytes, which are also known as air plants, are small plants which grow on tree branches, rather than in the soil. They have special roots which are different to in the soil, to help them grow on the trees. Therefore on the tree, they are growing a great deal better than in the soil. This adaptation helps them to grow on trees.

4. Many animals of the rainforest are camouflaged which aids them in avoiding predators. An example of this is the South American three-toed sloth. This animal has fur covered with green algae which is perfect camouflage in the forest canopy. This adaptation helps animals to hide in wait for prey.

5. One adaptation quite the opposite of camouflage is that of the brightly colored poison arrow frogs and poison dart frogs. The bright colors of these species serve as a warning to predators not to eat them. These frogs are so poisonous that natives wipe their arrow heads on them to make them more lethal. This adaptation helps them to avoid being eaten by predators.

6. Some animals have adaptations that enable them to eat food that other animals can't. For example parrots have strong beaks that crack the shells of very hard nuts. This helps them to get their food

If you put an organism in another place besides its natural habitat I will die. The organism will die because it is not adapted to live there. For example, polar bears live in the arctic because of their white coats blend into the snow. If they were moved to the desert they would no longer blend into their surroundings and would die.

Natural Selection

Natural selection is how the environment affects the different organisms. The organisms have to adapt to their environment.

Studies found changes from one generation to the next in the distribution of beak shapes with the medium ground finch on the Galápagos island. The birds have inherited variation in the bill shape with some birds having wide deep bills and others having thinner bills. During a period in which rainfall was higher than normal because of an El Niño, the large hard seeds that large-billed birds ate were reduced in number; however, there was an abundance of the small soft seeds which the small-billed birds ate. Therefore, survival and reproduction were much better in the following years for the small-billed birds. In the years following this El Niño, scientists measured beak sizes in the population and found that the average bill size was smaller. Since bill size is an inherited trait, parents with smaller bills had more offspring and the size of bills had evolved to be smaller. As conditions improved larger seeds became more available, the trend toward smaller average bill size ceased.

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2 years ago

Thank you Elena

2 years ago

Love the video at the beginning! Try and put your biotic factors into two columns or a horizontal list of plants and animals to minimize space. Also, check for capitalization on a few things.

2 years ago

Thank you @dianegunnip I will change my biotic factors into 2 columns

2 years ago

your portfolio is great

2 years ago

i like the lots of pics

2 years ago

Great portfolio! Just check for some capitalization stuff but then that, nice work!

2 years ago

Great portfolio. Your pictures and examples were fantastic.

2 years ago
2 years ago

I think everything looks great!

2 years ago

Great job!