The Desert By Kevin, Azaria, Cory, Landry Geography By: Kevin • Deserts are found in these places around the world (Antarctica is technically a cold desert but it is cut off on this map.) Some deserts are full of sand dunes others may look very flat. Off roading is one of many ways that humans impact deserts because They ruin the soil and crush plants and sometimes animals. Wooly Daisy Bonaist Saguaro Catcus How does it grow? Drought plants often grow only about 1/4 before Producing one Head How does a saguaro cactus plant Grow? The Thing that help it is growing thick, column like stems, branches and flower. These thing help The cactus live for 75 years • Prickly Pear Cactus Botanist http://bioweb.uwlax.edu/bio203/s2012/stein_made/Adaptation.htm Adaptation is its defense mechanism, in the intimidating aspect and the painful impact of its barbed spines and bristles. Still another adaptation is the flexibility of its stem. The stem moves, processes and stores water, nutrient solutions, and energizing photosynthetic products. • Prickly Pear Cactus • • • http://www.buzzle.com/articles/barrelcactus-adaptations.html What helps it grow is? A swollen trunk which stores water, a shallow root system to catch water whenever it rains, rounded shape and no leaves to minimise water loss. They also have a special metabolism which allows the stomata to stay closed during daytime when water loss would be greatest, opening at night to release oxygen and absorb carbon dioxide which is stored as malate which is then used in photosynthesis during the day. Barrel Cactus Botanist What Helps it grow The leaves are spirally arranged, with a deeply toothed margin. Some species, notably X. spinosum, are also very thorny with long, slender spines at the leaf bases. • Cocklebur http://scienceray.com/biology/ecology/plants-and-animalsadaptations-to-the-desert-biome/ What Help the Tree Grow? They have a thick waxy layer over the cuticle for even more protection from water loss. The leaf lasts for several years as part of rosette of short pointy leaves at the ends of bra branches.Leaves in the lower rosette are more horizontal and shaded by upper leaves. Leaves in the upper rosette are more vertical to reduce heat and water stress • Joshua Tree Botanist http://oleaeuropea.wordpress.com/2011/07/27/in dian-paintbrush-a-pretty-parasite/ http://www.youaskandy.com/questions-answers/30-articleseries-1970/10659-how-does-a-tumbleweed-live-.html What help it survive? What helps it Grow? Haustoria it diggen to other roots and takes there resource The Brown dead twigs, bowling down the road or over a field. Naturally you wonder how in the world such a plant manages to survive. • Tumble Weed Botanist What helps a cactus grow? Plant the Hedgehog cactus in the spring or fall in full sun. This type of cactus does not respond well to compacted soil that doesn't drain well, or soil that is too fertile. In fact, this cactus plant thrives in rocky or gravelly soil • Hedgehog Cactus What's help it grow? When it flowers, the spike with a cyme of big yellow flowers may reach up to 8 m in height. Its common name likely derives from its semelparous nature of flowering only once at the end of its long life • Century Plant Meteorologist Part 1 Desert Biome Temperature The desert climate is normally dry. It is immensely hot. The average wind speed or velocity for the desert is 11 MPH. The average temperature for a desert is around 40° celsius or 104° fahrenheit. The highest recorded temperature in a desert is 134° in Death Valley a desert in California. The lowest ever for a desert is -128.6° is in the Arctic Desert. Meteorologist Part 2 • DEATH VALLEY ARCTIC DESERT Meteorologist Part 3 Precipitation and Rainfall The desert biome on average receives about 15 centimeters of rainfall a year. That is not a lot at all. But think about it, if your in the one of the most dry places on earth how much rainfall do you expect? Not a lot. The lowest is 1.5 CM of rainfall in the Atacma Desert of Chile. Some years for them are even completely rainless. American deserts get a lot more rainfall around 28 cm. A popular american desert is the Great Basin desert. It is located in 5 different states. Nevada, Oregon, Washington, California, Utah and Idaho. It is mostly in Nevada though. It is the largest North American desert at 184,427 square miles. Meteorologist Part 4 • ATACMA DESERT GREAT BASIN DESERT Meteorologist Part 5 Air Pressure and Humidity Patterns Actually a desert has very high air pressure because dry air is so clear that the sun can easily heat through the ground causing it to have very low humidity. That's also why there is little precipitation in deserts. Indentify significant weather patterns month to month or through out the year. In summer in most deserts its extremely hot during the day and only hot during the night. For us it mostly is warm during the day and cold at night. But then again dont forget the arctic desert where it is cold in the day and freezing at night. But that is because it is in Antarctica. Meteorologist Part 6 How would these patterns impact the enviorment and the organisms living in it? Well it depends on what kind of organisms your talking about. If your talking about animals then it depends if they are nocturnal or if they live in the day. They can live by being heated or they could die of dehydration. They could keep cool at night or freeze to death. Zoologist part 1 • Abiotic factors of the desert are the Sand, water, and temperature these help for hiding places, and protection from predators. • Biotic factors of the desert are cacti, and other plats these help for shade, and cacti give homes for some small animals. • Adaptions: The most common adaptation is staying in the shade of plants or rocks or by burrowing underground in the heat of the day. Many desert animals are nocturnal: they stay inactive in shelter during the day and hunt at night when it is cool. Some animals get all the moisture they need from the insects, plants and seeds they eat, and do not need to drink water. Most pass little moisture out of their bodies. They do not have sweat glands and pass only small amounts of concentrated urine. Fat increases body heat, so some desert animals have concentrated the body's fat in one place, such as a hump or tail, rather than having it all through the body. Some animals develop unique ways of surviving. The Thorny Devil, a lizard that lives in Australian desert areas, has a body that channels raindrops directly into its mouth when rain falls. The waterholding frog spends most of the year under the ground in Australian desert areas, and develops a sort of cocoon that enables them to store water to keep them going through the dry times. When it rains, they emerge to lay their eggs in puddles. The eggs hatch within days and the tadpoles develop quickly, before the water dries out. Camels are one of the few large mammals to survive in the desert, and have many special adaptations to help them. • • • • Zoologist part 2 • Food chains Zooligist Pt 3 • Carnivores: Rattlesnake Vulture Roadrunner Zooligist Pt 4 • Ommivores Desert Rats • Raven • Desert Night Lizard Zooligist Pt 5 • Herbivore • Camel • Desert Cottontail • Desert Tortoise Zooligist Pt 6 • Decomposers Earth worms: The role in the ecosystem they significantly modify the physical, chemical and biological properties of the soil profile. These modifications can influence the habitat and activities of other organisms within the soil ecosystem. Thank You For Watching!