Ecosystem Portfolio 3rd
Forest Ecosystem

Biotic Factors






Abiotic factors






What is Carrying Capacity?

Carrying Capacity - the number of people, other living organisms, or crops that a region can support without environmental degradation

The forest population of the organisms change over time by the killing of the animals and the resources that are needed to survive.

Limiting Factors

Limiting Factors - the environmental factor that is of predominant importance in restricting the size of a population.

limiting Factors:

1. Food



The American black bear is a omnivore and its prey is fish. Without its water,food,shelter the american black bear decreases.If the black bear stops eating fish the fish population increases.

Energy Roles

Energy Roles - determined by how the organisms gain their energy and how it interacts with other living things in its ecosystem.

Producers - are also called autotrophs,they receive their energy from the sun,make their own food through photosynthesis,and provide the most energy that feeds the rest of the forest ecosystem. examples: berries

Herbivores - an animal that feeds on plants. examples: rabbit, panda, deer, grasshopper

Omnivores - an animal or person that eats food of both plant and animal origin. examples: bear, raccoon, fox, pig

Carnivores - an animal that feeds on flesh. examples: fox, skunk, tiger, river otter

Decomposers - an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material. examples: bacteria, fungi, worms, algae

Scavenger - an animal that feeds on carrion, dead plant material, or refuse. examples: hyena, elephant, puma, fox

An autotrophic organism capable of producing complex organic compounds from simple inorganic molecules through the process of photosynthesis (using light energy) or through chemo-synthesis (using chemical energy). example: grass

Food Chains and Food Webs

Food Chains Vs. Food Webs - a food chain is hierarchical series of organisms each dependent on the next as a source of food and a food web system of interlocking and interdependent food chains.

When you remove the producer (Marsh Grass, Cattail) the grasshopper will die and soon all the organisms will die off.

Trophic Levels and Energy Pyramids

This Pyramid shows where the organisms get their energy from and as it keeps going up the energy gets less energy for the other organisms.

The producers are the largest in the trophic level because it has the most energy which the producers get the energy from the sun. The predators have the least energy because they get the energy from what they eat.

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