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Desert biomes

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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


1
Desert biomes
  • J Cho
  • Alex M.
  • Max the Man Meehan

2
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
    Celsius
  • Min. Temp. can drop to 18 degrees below zero
    Celsius

3
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

4
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
5
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.

6
Hot and Dry (Organisms)
  • The animals include small nocturnal (active at
    night) carnivores.
  • The dominant animals are burrowers and kangaroo
    rats.
  • There are also insects, arachnids, reptiles and
    birds.
  • 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.

7
Hot and Dry (Food Chains)
  • Hawk
  • Rattlesnake
  • Jack Rabbit
  • Ground Hugging Shrubs

8
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

9
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

10
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

11
Semi- Arid(Food Chains
  • Snakes
  • Kangaroo rat
  • Grasshopper
  • Forbs

12
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

13
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

14
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

15
Coastal Desert (Food Chains)
  • Eagles
  • Snakes
  • Lizards
  • Insects
  • Black sage

16
Cold Desert (Temp/ Rainfall)
  • Temperature
  • Rainfall
  • Cold winters with high snowfall and high overall
    rainfall
  • 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

17
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

18
Cold Deserts (Animals)
  • Widely distributed
  • Ex jackrabbits, kangaroo rats, kangaroo mice,
    pocket mice, grasshopper mice, antelope, and
    ground squirrels

19
Cold Deserts (Food Chains)
  • Killer Whale
  • Seals
  • Small fishes
  • phytoplankton

20
Chaparral Biome
  • Chaparrals exist in a mid latitude climate and
    lie in a belt of prevailing westerly winds

21
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

22
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
    sprouting
  • 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

23
Chaparral (Animals)
  • Ex Aardwolf, Black tailed Jackrabbit, Cactus
    Wren, Golden Jackal, Grey fox, Island Grey fox,
    Puma, San Joachim kit fox, Spotted skunk, wild
    goat

24
Chaparral (Food Web)
  • Pumas
  • Aardwolf
  • Termites
  • Cacti
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