Forest Ecosystem

Biotic Factors: Living Factors in an Ecosystem

Animals                                                 Plants

Bear                                                   Grass        Rabbit                                          Trees      squirrels                                              Flowers    sheep                                                   mosses       

Abiotic Factors: Non-Living Factors in an Ecosystem

Warm Temerature  







Carrying capacity

The largest number of individuals of one species that an environment can support. A population needs food,water,shelter, and space to survive. If the rabbit population in the forest went into hibernation, the rabbit population would plummet, but once hibernation is over the resources are available again and the population will have a greater amount.

In this photo the bunny is surrounded by snow and not that many resources, meaning that the population is probably very scarce.
Meanwhile in this photo we see a bunny surrouned by resources and in the sun, meaning that the population is greater than it was in the last

Limiting factors

Any factor that limits the growth of a population in an ecosystem like; temperature, low amounts of food and water, etc. When the population of certain animals are low, it is hard for a bear to saturate his/her hunger. This is an example  of limiting factors.

Energy Roles

Energy roles is what an organism's role is in a food web.

In this photo of a food web of animals that live in the forest, all organisms have a role in the web. For example, in part of the food web the tree (producer) gives energy to the rabbit, the rabbit (1st order heterotroph) gives energy to the wild cat (2nd order heterotroph), and the wild cat gives energy to the lion ( a 3rd order heterotroph). The tree, or producer, is very vital to the forest and the food web, because then the primary consumer wouldn't have anything to eat, then the secondary consumer can't eat anything, and then the top consumer can't eat anything.

Food Chains & Food Webs

It is better to use a food web rather than a food chain, because it makes the diagram show more than just four or five animals and says more information about each organism.

If I removed even one organism from the food web, than either an animals population could grow, or it could decrease. For example, if the deer population drastically decreased than the bear population would have one less population to receive energy from.

Food pyramid\

The reason that an energy pyramid is shaped as a pyramid is because the shape of the pyramid goes biggest to smallest, telling what the biggest consumer is. The producer is at the bottom, because the producer will always wind up giving every organism it's energy (the herbivore gets energy from the producer, the carnivore gets it's energy from it, and the top carnivore gets it's energy from it). The top carnivore is at the top, because no organism can get energy from it.


Chemical Equation: CO2+H20-->C6H1206+02

  Photosynthesis needs carbon dioxide, water, and sunlight. The producer will produce oxygen, because of photosynthesis.


There are plenty of different tropisms in a forest. Phototropisms for example, there are trees, grass, various flowers, etc.

These tropisms help these plants survive by helping them get the resources they require to live.


A forest needs decomposers so that producers can receive energy from the nutrient pool. If the forest had no decomposers, than the producers couldn't take their part in the cycle of matter. There plenty of decomposers in a forest: fungi, worms, slugs, snails, and certain beetles.


Adaptations are important because organisms need to adapt to their environment to survive many things like harsh weather, flying, hiding, etc. A bear adapts to it's teeth to rip it's prey apart, a cameleone can use it's skin to blend into almost any surface.

If took a rabbit out of a forest and put it into a desert, than it would starve because it wouldn't have any producers to eat.

Natural Selection

Natural Selection is when an organism adapts to their environment to survive. A bear uses natural selection by choosing it's food, for example, if a bear goes to a lake and seas 2 types of fish, fast fish and slow fish, than the bear will choose the easiest prey to catch, which makes the population of the fast fish grow and the slow fish's population decreases.

Comment Stream

2 years ago

Look at the spacing of your biotic factors, and you need to add pictures for your biotic and abiotic factors.

2 years ago

looks great keep up the good work :)

2 years ago

Good info and nice pics

2 years ago

Nice pics and good definitions

2 years ago

lots of info and great pics

2 years ago

great pics and awesome information