Intro California Deserts - Mt & Desert

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12 Terms

1
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3 CA Deserts

  • Great Basin

  • Mojave

  • Colorado/Sonoran

2
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Great Basin Location

  • Most North

  • In rain shadow of Cascade & Sierra Nevada Ranges

<ul><li><p>Most North</p></li><li><p>In rain shadow of Cascade &amp; Sierra Nevada Ranges</p></li></ul><p></p>
3
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Mojave Desert Location

  • Middle, closest to us in SoCal

  • In rain shadow of Transverse Ranges

<ul><li><p>Middle, closest to us in SoCal</p></li><li><p>In rain shadow of Transverse Ranges</p></li></ul><p></p>
4
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Colorado/Sonoran Desert Location

  • Most Southern

  • in rain shadow of Peninsular Ranges

<ul><li><p>Most Southern </p></li><li><p>in rain shadow of Peninsular Ranges</p></li></ul><p></p>
5
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Rain shadows are due to which mountain ranges?

  • Cascade

  • Sierra Nevada

  • Transverse

  • Peninsular 

<ul><li><p>Cascade</p></li><li><p>Sierra Nevada</p></li><li><p>Transverse</p></li><li><p>Peninsular&nbsp;</p></li></ul><p></p>
6
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Desert characteristics

dryness

  • receive less than 10 in of precipitation

  • dry air is clear air with ~90% of sunlight reaching the surface — intense UV rays

wind

  • air rises when warmed and sinks when cool, so desert air moves rapidly and is windy

soils

  • dry & alkaline (high pH)

  • coarse (don’t hold water)

  • little organic matter

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Sagebrush

Dominant plant of GB

  • Artemisia tridentata

  • leaf shape: tri = 3, dentata = teeth

<p>Dominant plant of GB</p><ul><li><p><em>Artemisia tridentata</em></p></li><li><p>leaf shape: <em>tri</em> = 3, <em>dentata</em> = teeth</p></li></ul><p></p>
8
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Joshua Tree

Dominant plant of Mojave (1/2)

  • Yucca brevifolia

  • dominant at lower elevations

<p>Dominant plant of Mojave (1/2)</p><ul><li><p><em>Yucca brevifolia</em></p></li><li><p>dominant at lower elevations</p></li></ul><p></p>
9
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Creosote bush

Dominant plant of Mojave (2/2) & CD (1/4)

<p>Dominant plant of Mojave (2/2) &amp; CD (1/4)</p>
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Agave

Dominant plant of CD (2/4)

  • CA native

  • slow growing

  • stiff, thick leaves; sharp edges & pointed end

  • sends up tall spike w/ yellow flowers at 20-24 yrs

  • attract hummingbirds & insects

<p>Dominant plant of CD (2/4)</p><ul><li><p>CA native</p></li><li><p>slow growing</p></li><li><p>stiff, thick leaves; sharp edges &amp; pointed end</p></li><li><p>sends up tall spike w/ yellow flowers at 20-24 yrs</p></li><li><p>attract hummingbirds &amp; insects</p></li></ul><p></p>
11
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Ocotillo

Dominant plant of CD (3/4)

  • very tiny leaves

    • conserve water

    • drop during dry periods

  • many spines — deter herbivores

  • reduce evaporation & conserves water

  • stem photosynthesis

<p>Dominant plant of CD (3/4)</p><ul><li><p>very tiny leaves</p><ul><li><p>conserve water</p></li><li><p>drop during dry periods</p></li></ul></li><li><p>many spines — deter herbivores</p></li><li><p>reduce evaporation &amp; conserves water</p></li><li><p>stem photosynthesis</p></li></ul><p></p>
12
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Fan Palm

Dominant plant of CD (4/4)

  • at an oasis

<p>Dominant plant of CD (4/4)</p><ul><li><p>at an oasis</p></li></ul><p></p>