Ecosystem Portfolio

Forest Ecosystem

Abiotic Factors:
The most abiotic feauture of a forest ecosytem is sunlight.
Abiotic factors include soil,minerals,rocks,and water.

Biotic Factors: The most biotic feauture of any forest ecosystem is it's trees. Biotic factors include shrubs,ferns,mosses,lichens,fungi
mammals,birds,reptiles,insects,        worms,and microbes.
Step 3: Carrying capacity and changes in population.

Carrying capacity is

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

4 resources needed for survival are :

Animals need food, water, shelter, and space to survive.

  • Herbivores can live only where plant food is available.
  • Carnivores can live only where they can catch their food.
  • Omnivores can live in many places because they eat both plants and animals.
  • Habitat is the physical area where an animal lives

    Our precious forests provide many benefits to the human population. They help clean our air, protect our watersheds, are one of the most important renewable resources for meeting many human needs, and provide the place for much of our outdoor recreation. For many of us the forests are a place of spiritual renewal where we go to get away from the business of every day life and connect with the mysteries of the universe. Without our forests human life would be much different. Yet because of the size and growth of the human population we are placing tremendous stress on them. Climate change, acid rain, development, fragmentation, conversion of forest land to agricultural land, and industrial-type forestry practices are all changing the quality of our forests and, in many areas, the quantity of our forests.

    Step 4:
    Limiting Factors/Predator/Prey Relationships:
    Limiting Factors means
    the factor that limits the reaction rate in any physiological process governed by many variables. : the environmental factor that is of predominant importance in restricting the size of a population <lack of winter browse is a limiting factor for many deer herds.An example of a limiting factor is sunlight in the rain forest, where growth is limited to all plants on the forest floor unless more light becomes available.
    An Example of a predator/prey relationship in a forest would be a Red Fox and Arctic Ground Squirrel.

    Step 5:Energy Roles:
      Producers are any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar. An omnivore is a kind of animal that eats either other animals or plants. A herbivore is an animal that gets its energy from eating plants, and only plants.

    Producer: northern red oak

    Herbivore: moose


    Food webs are more realistic than food chains because food chains are

    a hierarchical series of organisms each dependent on the next as a source of

    food,and a food web is

    a system of interlocking and interdependent food chains.

    If you take away a deer for example,the food web/chain would be smaller but better because the deer is biggest consumer.

    Step 7: Trophic Levels and Energy Pyramids:

    The trophic level of an organism is the position it occupies in a food chain,

    A food chain represents a succession of organisms that eat another organism and are, in turn, eaten themselves

    The number of steps an organism is from the start of the chain is a measure of its trophic level. Food chains start at trophic level 1 with primary producers such as plants, move to herbivores at level 2, predators at level 3 and typically finish with carnivores or apex predators at level 4 or 5.

    The path along the chain can form either a one-way flow or a food "web".

    Ecological communities with higher biodiversity form more

    complex trophic paths.

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