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Transcript of The Sahara
The Sahara Desert at over 9,400,000 square kilometers covers most of Northern Africa. Its latitude stretches from approximately 35 degrees N to 15 degrees N. Its longitude extends from approximately 35 degrees W to 15 degrees E.
The Sahara Desert stretches into 9 countries. Egypt, Sudan, Chad, Mali, Algeria, Niger, Tunisia, and Libya. The Sahara Desert is found North Africa. It has many different animals and holds some cool wildlife. The kangaroo mouse
(genus Dipodomys) sand cats
(felis margarita) fennec fox
(Vulpes zerda) Addax
(Addax nasomaculatus) BIOTIC ABIOTIC sand dunes
little amount of water
1/4 of the Sahara is mountainous
Water (Nile river worlds largest river) In Sahara desert, animal population consists of animals such as desert hedgehog, kangaroo mouse, sand cats etc.
cactuses in Sahara desert have thickened their stems in order to hold water for longer period; and reduced their leaves to spines to minimize water loss through the leaf stomata. Some common desert plants are cypress, olive, acacia, while the types of grasses include Pancium and Aristida. specific organism kangaroo mouse Kangaroo rats inhabit a variety of desert niches. These can include open desert scrub, open grasslands, washes, or sandy soils.
Kangaroo mouse requires no water they dervie moisture from the grass and seeds they eat.
They excavate large burrows that are 4 feet deep, and have 12 entrances. During the day the rodents plugs the entrances to keep th etemprature low, and to also camouflage from predators.
The primary diet of the kangaroo rat consists of seeds. Mesquite, creosote bush, purslane, ocotillo and grama grass are some of the seeds that it has been known to eat. The kangaroo rat carries these foods around inside its cheek pouches. ENERGY PYRAMID DECOMPOSERS 5 Decomposer and Scavengers :
Coyotes BIOMASS limiting factors Limiting factors include the lack of
available water in the Sahara, too hot
temperature in day and too low
temperature at night, and too strong
winds Example of Mutualism Bees pollinate cacti flowers.
A Coyote eating a plant fruit and dispersing the seeds elsewhere in their feces. (The animal benefits from eating, and the plant benefits from the seed dispersal.)
Microbes on a cactus help the cactus absorb water. Example of Commensalism Gopher snake use an abandoned rodent hole. It does not affect the rodent hole.
A desert holly shrub providing shade for a young creosote bush.
A cactus wren builds its nest in a cholla cactus to protect its young ones from predators such as raven. There is no harm to the cactus. Example of Parasitism A flea is a parasite on a coyote. The flea benefits by drinking the coyote's blood, but the coyote, by losing blood and acquiring discomfort and potential disease, is harmed.
Mistletoe is parasitic on the desert ironwood. competition The population of snakes (prey) effect the population of hawks (predator) due to time lag. The cycle begins when the snake population decreases as the hawks eat the snakes. Then the hawk population decreases as available snakes run out. The cycle continues as the decreased number of hawks allows more snakes to survive, and the snake population rebounds. Then, the hawk population increases because it now has an abundant food supply. The hawks reduce the snake population and the cycle begins again. ENVIRONMENT CONCERN One of the main reasons that it has such a small population (2 million people) is due to the little rainfall it receives. Being the size of the United States, and one of the hottest places on earth, lots of Desertication happens.
The weather is very unpredictable
The more trees and other plants get cut down, the less rainfall there is. This also increases the air borne dust which makes the place hotter.
Many harmful insects such as the Desert Locust, harm peoples homes and food. HUMAN INTERFERENCE The desert is so unfriendly to human life has helped preserve it from being overrun by those who could destroy its ecological balance. links http://www2.newcanaan.k12.ct.us/education/components/scrapbook/default.php?sectiondetailid=10938
http://www.galeschools.com/environment/biomes/desert/human.htm BY ELI MAPIS