Desert #ecosys2



Biotic factors are the living things in the ecosystem. From the tiniest bacteria to the largest mammal. They all need abiotic factors in order to survive. They also need air to breath and light to photosynthesize.


Abiotic means not living. Abiotic factors include temperature, soil, light, aspect, atmospheric gases present, sunlight, wind, wind patterns, precipitation, habitat, season, cloud cover, altitude and location of the ecosystem.

    Carrying capacity and changes in the environment

Carrying capacity is the maximum population size of the species that the environment can sustain indefinitely. Resources needed for population to survive are food, habitat, water, and other necessities found in the environment.

If a camels ecosystem went bad what would they do? Well camels are very adaptable.  They can survive without food for 30 days and without water for two weeks. Meanwhile they can travel to a different area with better food,water,and shelter. Camels can adapt to very hot or cold climates.

Limited factors-the environment factor that tends to restrict the size of a population. A rattlesnake eating a mouse,lizards eating an insect, and coyotes eating a gila monster.

A rattlesnake eating a mouse is lowering the population of the mouse.The limiting factor can effect them by keeping the mice from getting over populated.

                              Energy Roles

Producers in the desert are plants such as the columnar cacti, the prickly pears, the chollas, the yuccas, the agaves, the sotols, the ocotillo and the omnipresent creosote bush. After a producer has captured the sun’s energy it uses it to grow plants for other organisms to come along and eat. This is very important to the survival of consumers.

The primary consumers of the desert are rodents, such as the antelope ground squirrel and the kangaroo rat, as well as rabbits and hares, such as the desert cottontail and blacktail jack rabbit. Examples of each consumer: Herbivore-rabbit, Carnivore-snake,  Omnivore-frog, and Scavenger-hawk.                                 

They receive there energy by the sun and the food that they eat.                                     So they can stay alive so the grasshopper can eat the grass and the frog eats the grasshopper and that snake eats the frog and the hawk eats the snake.

The last part of the energy role is the decomposers. These are organisms that break down dead or decaying organisms. In the desert you find mushrooms, millipedes, and earthworms.

Food chain and Food webs

A food chain is a straight line of links starting with the producers, such as grass or trees and ending with the decomposers. A food web diagram shows the relationships between organisms in an ecosystem. The food web is more detailed and can show exactly what's in your ecosystem. If you removed one population from the food web it would cause other populations to either adapt or die off. Example: If the mouse no longer existed, the snakes and eagles would have to find another food source or die.

                           Energy Pyramid

The producers are shown as the largest part of the pyramid because they are the start of all energy given to everyone else. They are the most important level with the most energy. The predators are in the smallest part of the pyramid because they create the least energy. The use of the pyramid instead of other shapes is because it shows the best increase of energy down to the bottom.




Tropisms-The turning or bending movement of an organism or a part of an organism in a particular direction in response to an external stimulus such as light or gravity.  Examples: A cactus bends towards the sun light or Pholisma Sonorae Flowers pushing through the sand. Tropism helps the plants in the desert survive because it can help the plants move towards the sun and get the energy they need to survive.          

                         Role of Decomposers

Decomposers are important because it breaks down dead plants and animals.

If there were no decomposers there would be dead plants and animals everywhere.

Some decomposers are beetles, earthworms, millipedes ,and mushrooms.

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