Ecosystem Portfolio

Desert Ecosystem

Biotic Factors:
1. Cactus
2. Road Runner
3. Snake
4. Birds
5. Mice
6. Flowers

Abiotic Factors:
1. Rocks
2. water
3. Sun
4. Air
5. Sand
6. Dirt

Carrying Capacity:
The number or quantity of people or things that can be conveyed or held by a vehicle or container.
Resources:
1. water
2. food
3. Shelter
4. oxygen

In the desert, there is a limiting amount of water. The animals have to adapt to the environment and only a few animals will get water from some places. Animals sometimes die off because they do not get water and dehydrates.

Limiting Factors: The environmental factor that is of predominant importance in restricting the size of a population
Examples:
1. Not a lot of water
2. lots of predators
3. lots of sand

a predator/prey relationship in the desert is a Hawk and a Squirrel. A limiting factor that effects that is water. If the hawk does not get a lot water then the Squirrel get to live longer. If the squirrel does not get a lot of water then the squirrel will die faster. The hawk will then not have enough food.

Producers: def:is an organism, either a green plant or bacterium, which is part of the first level of a food chain; Cactus, flowers,little bits of grass

Herbivores: def:any organism that eats only plants; pack rat, squrrel

omnivore: def: an animal that only eats plants; Road Runner

carnivores: def:Any animal that only eats meet; Fox

decomposers: def:an organism that breaks down the cells of dead plants and animals into simpler substances; worms, beetles, mushrooms

scavenger: def: an animal that feeds only on dead organic matter; Vultures,raccoon

Food Chains VS. Food Webs

Producers get their energy from the sun, consumers get their energy from the producers and from other animals, decomposers get their energy from the consumers.

Food webs are more realistic because one animal does not only eat one thing. Food chains the energy travels in one direction. Food webs show the energy flowing in all different kinds of directions.

When a population is removed the population(s) that it eats will have more because less animals will be eating it.

Trophic level and energy pyramids

We use a pyramid because each level only 10 percent of the energy goes to the next one. It gets smaller every time.

There are a lot of producers and they give the energy to the consumer. The top consumers are at the top because there is nothing that eats them.

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