Ecosystem  Portfolio


The Arctic

Biotic Factors: Living in the Arctic

Plants & Animals

Polar Bears
Flowered Plants

Abiotic Factors: Non-Living Factors in the Arctic

Cold Temperatures
Cold Water
Dry air

Carrying capacity

1. Carrying capacity is when a large amount of species can be supported by the environment and food, water, shelter, and space help them survive.

2. In my ecosystem deer have some hard times like sometimes they don't have the resources they need to survive also it makes the population decrease but not all die soon they start to reproduce and more deer are living in the ecosystem.

Limiting factors

1. Limiting factors is any factor or condition that limits the growth of an ecosystem for example  when an ecosystem has a lack of resources the animals will not be able to let their species grow.

2. wolves and caribou both live in the arctic the wolf is the predator and he hunts the caribou to eat for energy. the caribou eats plants to obtain energy.  

Energy Roles

Energy roles is the producers, first level consumers, secondary consumer and third level consumers. The first level consumer eats the producer such as a reindeer eating grass, then comes the polar bear who eats the reindeer. Last but not least you have the Arctic dog that eats the animals that just die naturally.

food webs over food chains

Trophic levels and enery pyramids

A food web is more realistic to use than a food chain because it shows every possibility of how things are eaten. If you took out the population of one organism some of the other organisms populations would go up and some populations would go down.


polar bears are at the top of the the energy pyramid because it eats most of everything they  get 1 k cals. The arctic dogs and seals are next because they are eaten by the polar bear, but they get 100k cals from the animals that they eat. Next under them are the animals that only eat plants they get 100 k cals. Last but not least are the producers and they get 1,000 k cal.

6 co2+ 6 h2o > c6h12o6 + 6 o2 is the chemical equation


Photosynthesis is a process for plants and other organisms use for light also known as chemical energy that is stored and is soon released for all of the organisms that need it from the producer. Photosynthesis takes place inside the chloroplasts.

Trophisms is an orientation of an organism to an external stimulus, as light, especially by growth rather then movement. For example the arctic pine tree uses the sunlight so that it can grow big and tall, soon it lets off stuff for the other organisms to use. In the picture below thigmotrophism is happening

The role of decomposers

Decomposers help my ecosystem stay living, because they help keep the soil and other things in the habitat going. If I did not have decomposers in my ecosystem there really wouldn't be anything because nothing is helping the cycle continue. Some decomposers you would find in my ecosystem are many kinds of bacteria, mold, and various beetles.


With adaptations in the arctic animals have to adapt to the cold weather, food resources and some of the animals. If I place the Arctic Fox in an different ecosystem it would probably not be able to survive because it would not be used to the environment and the things that happen in that different environment.

Natural Selection

Natural selection happens when there is a change in the environment and it is important to have it because if the ice in the arctic starts melting it will help to adapt to the change. An organism that has been naturally selected in my ecosystem is the Polar bear because they have white/cream fear that helps them blend in and survive in the Arctic.

Comment Stream

2 years ago

Nice pictures!

2 years ago

Nice pictures

2 years ago

Good job and very informational!🎩

2 years ago

thanks for all of your nice comments @chloedillard @NIJ321655 and @matthewfranco

2 years ago

Thank you for the cool Tackk.

2 years ago

You did a good job! I liked your pictures

2 years ago

thanks @paytonsmith

2 years ago

@NIJ321655 who are you?

2 years ago

A girl who what to talk.