Desert Food Chains
Food chains allow us to examine the basics of how energy passes through an ecosystem.
A food chain is sequence of plants, herbivores and carnivores, through which energy and materials move
within an ecosystem. Food chains are usually short and not more than three or four links. They usually
consist of a producer, a consumer and a predator, with the predator being the top of the food chain. The
top of the desert food chain does eventually die though, and is returned to the bottom of the chain as nutrients
Typical Desert Food Chains
Desert Food Pyramid
A pyramid representing trends in food consumption, with the lowest level (primary producers) having the greatest total biomass,
Desert Food Webs
The interconnected feeding relationships in an ecosystem. These relationships can be complex; some organisms
Man is the top predator in any desert environment whether by intention or accident. An example of this
is the coyote. The coyote's natural predator was at one time the wolf. The wolf has been extirpated from the
Mojave Desert by man, however, man and his motor vehicles have taken the place of the wolf as the primary killer
The tortoise and the chuckwalla are the largest reptilian herbivores in the Mojave. The tortoise will only
eat plants throughout it's life cycle while young chuckwallas have been known to sample a grasshopper or two.
Mule deer and bighorn sheep are the largest mammalian herbivores in the Mojave. Mule deer are the prefered prey
of the mountain lion, while bighorn sheep are often in areas too vertical and dangerous for the big cats to successfully
attack. Coyotes will sometimes corner and kill an older bighorn as a pack, but prefer to scavenge the carcass of the
sheep killed by it's most dangerous predator- fly larvae. Flies will lay eggs in the nostrils of the bighorn. As the eggs
grow into larvae, the bighorn suffocates.