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Desert Biome

Ngoc Bui
by

Rahat Motiwalla

on 17 October 2012

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Transcript of Desert Biome

Unique Desert
Organisms Plants 3 Major Adaptations State of the Biome Average precipitation:
Less than 20 inches per year.
Plants & animals must be able to survive with little water for extended periods of time. Abiotic Factors Solar Radiation
Very few shade-giving plants
Almost all surface area has full exposure to direct sunlight during the day Limiting Factors
Water
there may be reserves of groundwater, however trapped under thousands of layers of rock.
Lack of vegetation due to the lack of water. Climatograms for a Desert Biome desert Jackrabbit Honey-pot Ant Camel Lizard Scorpion CAM Plants CAM Plants, are active during night
These adaptations also enable their owners to thrive in conditions of :
•high daytime temperatures
•intense sunlight
•low soil moisture. Animals Jack Rabbits
To dissapate heat long ears
Fur is a lighter color to better absorb heat than darker colors Desert animals like reptiles have minimized loss of water by excreting waste in the form of an insoluble white compound uric acid.
This adaptation ensures very little wastage of water. Uric Acid as Waste 1994 Congress passed the California Desert Protection Act but:
For instance at Mojave National Preserve
Problems:
Mining and Grazing Ongoing extraction of water and associated lowering of groundwater tables (springs dry up), groundwater contamination (particularly from mining wastes) Average temperature
Huge fluctuations during a 24-hour period.
little moisture
little humidity and cloud cover
ranges from hot during the day to below zero degrees at night.
Organisms that cannot adapt to rapid temperature fluctuations have trouble surviving. Soil composition
Varies greatly
Most have excellent drainage
Loose instead of compacted Geographic Features
Sand Dunes
Make up less than 2% of deserts in North America, 11% of the Sahara and 30% of the Arabian desert.
migrate constantly
migration depends on size of dune and wind speed.
larger dunes become permanent. From this climatogram we see a typical desert biome-some rainfall, dry during hottest months However here's another side to desert Along the 30 degree latitude Latitude/Longitude -Desert biomes are found on all continents except Europe.
-Deserts are most commonly known to be hot, but there are also major cold deserts and seasonal deserts. Biome of Study: Desert Wind Patterns
Global wind patterns carry down dry air from the upper atmosphere. Major Hot deserts include the Sahara desert (Nothern Africa), the Arabian desert, and Austraila. A Major Cold desert is the Gobi Desert, located in Nothern china and Southern Mongolia -"Desert Biomes." Desert Biomes. N.p., n.d. Web. 17 Oct. 2012. <http://www.blueplanetbiomes.org/desert.htm>.
-"Hot Deserts of the World." Hot Deserts of the World. Missouri Botanical Garden, n.d. Web. 17 Oct. 2012. <http://www.mbgnet.net/sets/desert/hot.htm>.
-"The Desert Biome." The Desert Biome. N.p., n.d. Web. 17 Oct. 2012. <http://www.ucmp.berkeley.edu/glossary/gloss5/biome/deserts.html>. Bibliography Air rises at the equator, and falls at the 30 degree mark, creating areas of high pressure and sinking air, allowing no clouds to form, thus no rain.
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