The Desert

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Information about The Desert

Published on September 24, 2008

Author: aSGuest169


The Desert : The Desert By:Nick M. and Ryan C. Global Distribution : Global Distribution Deserts cover about 1/5th of the earth’s land area. The largest desert in the world is the Sahara desert. Occupying 9 million square kilometers. North American deserts cover about 1.3 million square kilometers. Slide 4: from World Book multimedia encyclopedia 2004 Climate : Climate On average most deserts receive less and 25 cm of rain every year. However the amount of perception varies greatly from year to year. Several years may pass with out any rain only to be followed with intense flash flooding. Deserts include some of the hottest places in the world day time summer tempters often reach above 38 °C. At night desert temperatures drop to about 7 °C. Slide 6: Month Climatogram Death Valley, California data source Predominate Autotrophs : Predominate Autotrophs Most desert plants are drought- or salt-tolerant. Some store water in their stems, roots, and leaves. Other desert plants have long tap roots that penetrate the water table, then anchor the soil, and control erosion. In the desert there are many types of plants. The are trees such as Elephant Trees and the Joshua Tree. There are a lot of plants too. There are many different blooming plants that have colors from white to pink to blue to red. There are plants that bloom and ones that do not. Of course there are cactuses. There are a lot of cactuses. A very common type of cactus is Teddy Bear Cholla. Teddy Bear Cholla ← Baja Fairy Duster → Predominate Heterotrophs : Predominate Heterotrophs Deserts surprisingly support a wide range of animal life. Including reptiles, birds, as well insects spiders, and various types of mammals. Deer, foxes, wolfs may visit the desert after a heavy rain in search of food. Slide 9: Kangaroo Rat Horned Lizards Turkey Vulture Symbiotic Relationships : Symbiotic Relationships Mutualism- The yucca moth is the only thing in the wild that pollinates the yucca plant. However the yucca moth also lays its larvae in the yucca plant. Symbiotic Relationships : Symbiotic Relationships Parasitism- Desert mistletoe is commonly seen on desert trees. It may start small but may eventually grow to kill the entire plant Symbiotic Relationships : Symbiotic Relationships Commensalism- Gopher snakes often use abandoned rodent holes for homes. Symbiotic Relationships : Symbiotic Relationships Predation-An example of desert predation is between a gila monster and small rodents (mouse). Slide 14: Adaptations of Organisms •Most of the lizards and reptiles are cold blooded so the heat doesn’t bother them that much and if it does get too hot they simply go in the shade or in a hole. •Most mammals that live in the desert such as foxes, skunks, and most rodents are nocturnal. They sleep in a nice cool den during the day and come out at night when it is a lot cooler. • Most birds breed during the spring and leave the desert during the hot months. • Some animals such as squirrels sleep for days at a time to avoid the hot days and low vegetation and also hibernate in the winter to avoid the cold. • Animals such as the jack rabbit also disperse heat through their ears. •Some reptiles and birds have to retain water. They can get water when it is available and they also get it from underground. The birds can also get water from what they eat. The reptiles and birds keep water by uric acid wasting little water. •Most mammals have light colored skin, fur, or no fur at all. That is a way to reflect the sunlight instead of absorbing it. Slide 15: Adaptations of Organisms Special Attribute : Special Attribute Caliche- Caliche is a hardened deposit of calcium carbonate. It cements sand and gravel in to layers up to 50 meters thick. It can In occurs in deserts more often then other parts of the world because the minerals in the soil are usually less soluble and when water evaporates from the soil layers of Caliche are formed. Artistic endeavor : Artistic endeavor Bibliography : Bibliography World Book multimedia encyclopedia 2004

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