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Subtropical Desert Biome

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on 18 October 2013

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Transcript of Subtropical Desert Biome

Subtropical Desert Biome
by: Carolyn Pascal
Some desert locations are in North Africa, Mexico, australia, and southwestern U.S.
deserts cover 1/5 of Earth's surface
25-40 degrees North and South latitude
Subtropical deserts are extremely hot in summers with low humidity
winters usually rain fall and tempratures cool down
annual rain fall is no more than 19 inches and usually less than ten inches
Cold air descends then becomes warm but heat from the ground evaporates the water before it come down as rain
ground is hot because sun beats down on it directly
coriolis affect creates sand dunes
Animals: armodilo lizard, bob cat, cactus wren, coyote, bighorn sheep, javelina, cactus Ferruginoug pygmy owl
plants: barrel cactus, brittle bush, soaptree yucca, creosote bush, chainfruit cholla, crimson hedge hog cactus, desert iron wood, joshua tree, ocotillo
most mamals are nocternal to stay out of the extreme heat
high temperatures allows more cold blooded animals
Human Population in the desert
1/6 of earths population (more than one billion people) live in deserts.
some people live in mud houses that need to be well insulated from heat
they shield their skin from any sun
Food web
There is not many animals and plants in the desert. Producers are scarce because cactus is one of the only ones and it cant be eaten by others because of its spikes.
Resource Depletion
The desert has very little amounts of water for living organisms
the desert does have sunlight, copper. uranium, and rocks
there is very little resources because the climate is too harsh for many things to accumulate there
Keystone Species
- wood cutting for fuel
- provides habitat for birds and other animals (mutualism)
kangaroo rats:
- conserve water
- eats seeds which helps other species (mutualism)
- keeps desert shrub land from becoming grass land
- a parasitism is fleas
coyote is a preditor
Food production
when it rains plants take their chance to reproduce very quickly and they absorb moisture to last long periods of time with out rain.
people can grow vegetation in deserts using irrigation from oceans
the soil is typically rocky because there is so little rain than it hardens and then rain can't soke into it causing floods. there is also a lot of sandy deserts
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