The Forest Ecosystem

The Amazon Rainforest

Biotic Factors

 Animals                                   Plants

Spiders                                  Banana Tree

Hummingbirds                       Bamboo

Sloths                                    Vines

Lemurs                                 Shrubs

Opossums                            Ferns

Wasps                                  Cassava

Bees                                     Orchids

Parrots                                  Orange Tree

Jaguars                                 Avocado Tree

Toco Toucan                          Lemon Tree

Abiotic Factors




Warm temperature

Very little sunlight



Carrying Capacity

Carrying capacity is the largest number of individuals of one species that an environment can support

Resources needed to survive:





Changes in Population

A lemur eats fruit as a primary food source. If the sunlight doesn't reach the bottom of the forest then the fruit plants that the lemurs eat won't get enough sunlight and the lemurs would have to fight its species to survive.

Lemur eating fruit

Limiting Factors

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




Soil Nutrients

Habitat destruction


Predator/Prey Relationship

There is very little sunlight that gets to the bottom floor of the forest. The three toed sloth depends on leaves to provide food and energy so if the trees don't get enough sunlight and die the sloths won't have enough food to survive. If the sloth population lowers then it will effect the jaguars' food source.

Jaguar population once the sloths food source dies

Energy Roles


  • Organisms that make their own food by photosynthesis
  • Examples: Trees, grass, shrubs, ferns, flowers
  • Producers get their energy from the sun
  • Producers get their energy from the sun and they other energy roles depend on the sun energy to be able to move


  • Organisms that do not make their own food
  • Examples: Jaguars, Lemurs, Sloths, Macaws, Snakes
  • Consumers get their energy from producers

4 Types of Consumers

  • Herbivores eat ONLY PLANTS
  • Carnivores eat ONLY ANIMALS
  • Omnivores eat both
  • Scavengers eat the dead


  • Organisms that break waste and dead organisms and return the nutrients back the environment
  • Examples: Saprophytes, Velvet worms,  Vermilion Waxcap Mushrooms, Fungi
  • Decomposers get their energy from consumers
Vermilion Waxcap Mushroom


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

If I remove the white tail deer then there will be an excess in bark and the grey wolf would have one less prey so they would have to eat more of the eastern cottontail rabbit and the tufted titmouse which than means less food for the garter snake and the bald eagle.

Energy Pyramid

The pyramid show that the higher up it gets the least original sun energy there is. As well as the decrease of predators to prey.

Producers have a larger number because they make enough for primary consumers and if there is not a lot of producers then less energy can be transformed. The top predators don't pass on very much energy and they have less to supply with the energy because they have very little sun energy left



Tropism is turning or bending movement of an organism toward or away from an external stimulu

The tropisms help the plants get the resources they need and not get the resources they don't need.

The Role of Decomposers

Decomposers break down dead plants and animals and if they weren't in the ecosystem, the plants would not get nutrients the soil needs, and dead animals, plants, and waste would pile up.

                                                          Types of Decomposers

  • Cup Fungus
  • Oyster Mushrooms (Fungi)
  • Worms
  • Leaf Beetles
  • Vermilion Waxcap Mushrooms
  • Termites
  • Velvet Worm
  • Partula Snail
  • Fungi
  • Ants


         Adaptation is a change or the process of change by which an organism or species becomes better suited to its environment.The purpose of adaptations are to ensure reproduction and  survival of the species. In the rainforest, there are so many animals competing for food, many animals have adapted by learning to eat a particular food eaten by few other animals. Toucans adapt in the rainforest by developing long, large bills. This adaptation allows them to reach fruit on branches that are too small to support the bird's weight. The sloth uses a behavioral adaptation and camouflage to survive in the rainforest. It moves very slowly and spends most of its time hanging upside down from trees. Algae grows on its fur giving the sloth a greenish color and making it more difficult for predators to spot.

Tigers have fanged teeth so they and kill and eat their prey. The venus flytrap has long sharp teeth to let it eat its prey and the color of it helps it camouflage.

If you placed a toucan in the marine ecosystem the bird wouldn't survive because their body isn't meant for large amounts of water. Toucans have bills to get their fruit from small trees but in the ocean there isn't the type of fruit they eat there.

Natural Selection

Natural selection is the process that organisms better adapted to their environment tend to survive. This is important because if the organisms survive they produce more offsprings and the generation continues.

Around 4 million years ago, the tiger species split into two sub species due to a dramatic rise in sea level. The Tigress weber species and Tigress flippos species were both created.The species of tigers with webbed paws still had its same paw structure, so it could travel on dry land efficiently. The species of tigers with flippers instead of paws could swim very fast, but because the structure of its hand changed, it was no longer able to travel on dry land. The species of tigers with flippers were favored for a while because the sea level was so high. Many animals adapted to hunt for food in the water since most of the land was flooded. When the sea levels dropped back to their normal level, it caused this species of tigers to become extinct. The species of tigers with flippers was, and still is, successful and when the sea level rose, it developed webbed paws that were able to navigate through the water easier. Even after the sea levels dropped back to normal, the problem had been solved because it still had its paws unlike the species of tigers with flippers.

Comment Stream

2 years ago

I loved your portfolio and you have a lot of biotic factors. Good job!😊

2 years ago

Caroline, I think you did a good job at prosecuting your ecoportfolio😉

2 years ago

Thanks Tkai

2 years ago

Thanks Grace

2 years ago

Try and be a little more specific on the abiotic factors and see if you can find more clear picures. Yours are slightly blurry.

2 years ago

its good, but the pictures are a little blurry so maybe try to find more clear pictures

2 years ago

I like the way you're going! I would elaborate more when you're explaining your predator/prey example and your changes in population paragraph.😛 😉 😄 😃

2 years ago

like how you organized it with bullet points

2 years ago

I like your ecoportfolio;it is very nice and neat but I would suggest that you get a little bit more clearer pictures. Overall a very nice job!😄

2 years ago

Very good!