Biotic Factors: Living factors in an ecosystem.

Animals                               Plants
sornoran desert toad        barrel cactus
arizona barkscorpion        brittle bush
great roadrunner               chainfruit cholla
spotted hyenas                   joshua tree
sidewinder rattlesnake     soaptree yucca

Abiotic: nonliving factors in an ecosystem


Carrying Capicity: maximum population size of a species that the environment can sustain.

Resources needed to survive: food, water, shelter, and space. Deer need food, water and shelter to survive in the desert. There is not as much of those resources in the desert as in another biome.

Limiting Factors: Any factor or condition that limits the growth of a population in an ecosystem.

Limiting factors in an ecosystem include starvation, disease/parasites, accidents, weather, hunting and predators. A predator/prey relationship in the desert is a lion and a zebra. Limiting factors can affect them because if the zebras can't get food and water and the zebras die out, the lions will also die out.

Energy Roles:The three main energy roles are producers, consumers, decomposers

Cactus:producer; kangaroo rat:1st level consumer; western diamond rattlesnake;2nd level consumer; hawk;3rd level consumer

Each energy role gets its energy from the organism that it ate.

The role of producers in energy transfer is that they have the most energy in them and they help start a food chain.

Food Chains and Food Webs

Food webs are more realistic than food chains because food webs show all of the possibilities in an ecosystem than a food chain.

If I remove the desert hawk population then the Texas Horned Lizard population will grow and the Tarantula population will die out. If the Tarantulas die out, then the cactus wren population will grow, which means the saguaro cactus will vanish.

Trophic Levels and Energy Pyramid

The pyramid is shaped this way because it shows that there is less energy as you go up the pyramid.

The producers are at the base and the top predators are at the top because there is more energy at the base and less energy at the top.


Chemical equation: 6CO2+6H2O=C6H12O6+6O2

You need carbon dioxide, water and sunlight for photosynthesis to happen. It produces glucose and oxygen.

Photosynthesis takes place in the chloroplast within the plant cells

Tropisms: The turning of all or part of an organism in a particular direction in response to an external stimulus.

Examples: Gravitropism, Phototropism, Hydrotropism, Heliotropism

This is an example of gravitropism.                                         

These tropisms help a plant survive because they are reaching out to their resources.            

Decomposers are vital in the desert because they give nutrients to the soil by breaking down dead plants and animals. The affect if there are no decomposers is that dead plants and animals will build up.

Decomposers: Dung beetles, Termites, Fungi, Bacteria, Yeasts, and Ants.

Adaptations are important because they help the animal be better suited for the environment. Some adaptations are hair, feet, hands, and skin protection.

Plant adaptations                                                    animal adaptations                               Water stored in stem/leaves                                      shell for protection                                 Roots spread out wide                                           sharp claws                                                                                                                      long tounge                                needles for protection

Natural Selection: gradual process by which heritable biological traits become either more or less common in a population.

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2 years ago

I liked your graph a lot because it perfectly showed the carrying capacity of the deer.😀

2 years ago

This is a good tackk, Ethan. Keep up the good work!

2 years ago

Good job Ethan there's alot of sand(baby rocks)

2 years ago

Good job your tackk is onrganized well and is informative

2 years ago

I like pictures!

2 years ago

Your tackk is perfect. Nothing that i can see needs to be fixed.

2 years ago

Your tackk is awesome and I don't see anythign wrong

2 years ago

your tack is awesome

2 years ago

@everyonewhocommentedmytackk, thank you very much

2 years ago

I like the pictures and the ecosystem you used!