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Desert biomes


Desert biomes J Cho Alex M. Max the Man Meehan Hot and Dry (Temp.) The temperatures in the hot and dry deserts are extreme because of the lack of humidity Humidity ... – PowerPoint PPT presentation

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Title: Desert biomes

Desert biomes
  • J Cho
  • Alex M.
  • Max the Man Meehan

Hot and Dry (Temp.)
  • The temperatures in the hot and dry deserts are
    extreme because of the lack of humidity
  • Humidity- air which contains high amounts of
    water vapor
  • Without humidity there is a lack of protection
    from the suns ray
  • Average temp. ranges from 20-25 degrees Celsius
  • Extreme high temp. ranges from 43.5- 49 degrees
  • Min. Temp. can drop to 18 degrees below zero

Hot and Dry (Rainfall)
  • Rainfall is usually limited and only in short
    bursts in between long periods of time
  • Rainfall depends on regional location
  • Ex. Rainfall in Chile is less than 1.5 cm, while
    deserts in the US it averages up to 28 cm

Hot and Dry (Rainfall Cont.)
  • Evaporation rates often exceed rainfall rates
  • Fun Fact once in a while rainfall can sometimes
    evaporate before reaching the ground

Yuma desert valley
Hot and Dry (Vegetation)
  • Plants are mainly ground-hugging shrubs and short
    woody trees.
  • Leaves have water-conserving characteristics.
    They tend to be small, thick and covered with a
    thick cuticle (outer layer).
  • These plants include yuccas, ocotillo,
    turpentine bush, prickly pears, false mesquite,
    sotol, ephedras, agaves and brittlebush.

Hot and Dry (Organisms)
  • The animals include small nocturnal (active at
    night) carnivores.
  • The dominant animals are burrowers and kangaroo
  • There are also insects, arachnids, reptiles and
  • The animals stay inactive in protected hideaways
    during the hot day and come out to hunt at dusk,
    dawn or at night, when the desert is cooler.

Hot and Dry (Food Chains)
  • Hawk
  • Rattlesnake
  • Jack Rabbit
  • Ground Hugging Shrubs

Semi- Arid (Temp/ Rainfall)
  • This helps with the condensation of dew in the
    night, which can exceed the moisture some deserts
    get from rainfall
  • Average Rainfall 2-4 cm annually
  • Avg. Temp. 21- 27 degrees Celsius
  • The temp. rarely gets above 38 degrees Celsius
    and rarely gets below 10 degrees Celsius

Semi- Arid (Vegetation)
  • Spiny nature plants in order to reduce
    transpiration Silvery Glossy leaves
  • Ex. Creosote Bush, Bur Sage, white Thorn, Cat
    Claw, Mesquite, Brittle bush, Lyceums, and jujube

Semi-Arid( Animals)
  • Protection in underground burrows where they are
    insulated from heat and aridity
  • Ex. Kangaroo rates, rabbits, skunks,
    grasshoppers, ants, lizards, snakes, burrowing
    owls, California thrasher

Semi- Arid(Food Chains
  • Snakes
  • Kangaroo rat
  • Grasshopper
  • Forbs

Coastal desert (Temp/ Rainfall)
  • Avg. Temp 13- 24 degrees Celsius
  • Winter 5 degrees Celsius or below
  • Max 35 degrees Celsius
  • Min -4 degrees Celsius
  • Rainfall 8- 13 cm
  • Max 37 cm
  • Min 5 cm

Coastal Desert (Vegetation)
  • They grow in fine textured soil with moderate
    salt content
  • Extensive root systems sloe to the surface
  • Have thickly fleshy leaves or stems to take in
    available water
  • Ex salt bush, buckwheat bush, black bush, rice
    grass, and black sage

Coastal Desert (Animals)
  • Specialized adaptations for dealing with heat and
    lack of rain
  • Ex Coyote, badger, toads, great horned owl,
    golden eagle, bald eagle, lizards, snakes

Coastal Desert (Food Chains)
  • Eagles
  • Snakes
  • Lizards
  • Insects
  • Black sage

Cold Desert (Temp/ Rainfall)
  • Temperature
  • Rainfall
  • Cold winters with high snowfall and high overall
  • Short moist and moderately warm summers with
    fairly long and cold winters
  • Winter -2 to 4 degrees Celsius
  • Summer 21- 26 degrees Celsius
  • Avg. annual precipitation is 15- 26 cm
  • Max 46 cm
  • Min 9 cm

Cold Deserts (Vegetation)
  • Widely scattered
  • 10 percent of the ground is covered with plants
  • The areas of sage bush goes up to 85 percent
  • Heights vary between 15- 122 cm
  • Most are deciduous

Cold Deserts (Animals)
  • Widely distributed
  • Ex jackrabbits, kangaroo rats, kangaroo mice,
    pocket mice, grasshopper mice, antelope, and
    ground squirrels

Cold Deserts (Food Chains)
  • Killer Whale
  • Seals
  • Small fishes
  • phytoplankton

Chaparral Biome
  • Chaparrals exist in a mid latitude climate and
    lie in a belt of prevailing westerly winds

Chaparral Biomes ( Temp/ Rainfall)
  • Temperature
  • Rainfall
  • Hot and dry
  • Winter- mild 10 degrees Celsius
  • Summer- hot and dry up to 40 degrees Celsius
    (fires and droughts are common)
  • 10- 17 inches annually
  • Because of the hot and dry summer only hard
    leaved plants survive and many have adapted to
    have hairy leaves to collect moisture

Chaparral (Vegetation)
  • Have adapted to the fires by allowing their seeds
    to remain dormant until a fire occurs to crack
    the outer shell so that the plant may begin
  • Ex. Blue Oak, Coyote Brush, Common Sagebrush,
    Fairy duster, French boom, King protea, Lebanon,
    Cedar, Manzanita, Mountain Mahogany, Salt marsh
    Birds Beak, Olive tree, Torrey Pine

Chaparral (Animals)
  • Ex Aardwolf, Black tailed Jackrabbit, Cactus
    Wren, Golden Jackal, Grey fox, Island Grey fox,
    Puma, San Joachim kit fox, Spotted skunk, wild

Chaparral (Food Web)
  • Pumas
  • Aardwolf
  • Termites
  • Cacti