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[47]

G (a)

S

III

[68]

R

C

II

[71] [72]

G (b) G (b)

V C

I I

[80] [81] [82]

G G (c) R

S V C

III I

II

TERRESTRIAL ECOREGIONS OF NORTH AMERICA

Temperate Coniferous Forests

(114) Madrean Sky Islands Montane Forests Temperate Grasslands/Savanna/Shrub

(126) Western Gulf Coastal Grasslands Mediterranean Scrub and Savanna

  • (113)

    California Montane Chaparral and Woodlands

  • (159)

    California Coastal Sage and Chaparral

Xeric Shrublands/Deserts

    • (162)

      Sonoran Desert

    • (164)

      Chihuahuan Desert

    • (163)

      Tamaulipan Mezquital

  • (n)

    = Number in modified WWF ecoregions.

[n] Number in (Ricketts et al., 1999).

B =Bioregionally Outstanding,

a Conservation Assessment Word Wildlife Fund (Ricketts et al., 1999)

Biological Distinctiveness

This exercise evaluates and ranks only ecoregions present in Canada and the United States. Nevertheless it provides information on ecoregions stradling the United States and Mexico

G= Globally Outstanding, N =Nationally Important

R =Regionally Outstanding,

border. Major Habitat Type Ecoregion

Biological Final Distinctive. Cons Status

Cons. Class

  • (a)

    Ecoregion designated Globally Outstanding due to rare ecological or evolutionary phenomena because its pronounced local endemism.

  • (b)

    Ecoregion designated Globally Outstanding due to rare habitat type because the global rarity of Mediterranean scrub and savanna habitat type.

  • (c)

    The Chihuahuan Desert together with the Namib-Karoo of Southern Africa are the most diverse warm deserts in the world, with the Chihuahuan Desert ranking globally outstanding in reptile, bird, mammal and cactus richness. (Olson and Dinerstein, 1998)

Final Conservation Status

C = Critical,

E = Endangered,

V = Vulnerable,

S = Relatively Stable,

I = Relatively Intact

Conservation Classes and Recommended Conservation Action

Class I. Globally outstanding ecoregions requiring immediate protection of remaining habitat and extensive restoration. Class II. Regionally outstanding ecoregions requiring immediate protection of remaining habitat and extensive restoration. Class III. Globally or regionally outstanding ecoregions that present rare opportunities to conserve large blocks of intact habitat. Class VI. Bioregionally and nationally important ecoregions requiring immediate protection of remaining habitat and extensive restoration. Class V. Bioregionally and nationally important ecoregions requiring immediate protection of representative habitat blocks and proper management elsewhere for biodiversity conservation.

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