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HOTSPOTS

Earth’s Biologically Richest and Most Endangered Ecoregions Conservation International (Mittermeier et al., 1999)

According to CI's hotspot analysis, first conducted in 1990, then reviewed and updated in 1996 and 1999, scientists have identified 25 priority biodiversity hotspots, based on two criteria: the number of endemic species an ecosystem contains and the degree of threat it faces. Strikingly, these hotspots occupy less than 2 percent of the Earth's land surface and contain a disproportionately large percentage of biodiversity.

Almost 40 percent of all terrestrial species and roughly 25 percent of terrestrial vertebrate species are endemic to these areas (i.e., are found nowhere else). When considering total species diversity in hotspot ecosystems, they claim more than 50 percent of Earth's terrestrial biodiversity and roughly two-thirds to three-quarters of the most endangered species of plants and animals.

MESOAMERICA

This hotspot has a total area of 1,154,912 Km² comprising 0.77% of the total land surface of planet earth. Out of these, 230,982 Km² (20%) remain intact, of which 138,437 Km² (12%) have protected area status. Out of the total hotspot area 57% equivalent to 662,286 Km² cover 33.9% of Mexico’s total land surface.

Group/Biodivesity

Global Total

Hotspot

% Hot/Glob

Endemism

% End

E Rank

Birds

9,881

1,193

12.07

251

21.0

2nd

Mammals

4,809

521

10.83

210

40.3

1st

Reptiles

7,828

685

8.75

391

57.1

2nd

Amphibians

4,780

460

9.62

307

66.7

19th

Total Non Fish Vert

27,298

2,859

10.47

1,159

40.5

2nd

TROPICAL BROADLEAF FORESTS

Vascular Plants

300,000

24,000

8.00

5,000

20.8

10th

MAJOR ECOSYSTEM TYPE Major Habitat Type Ecoregion ( n) = Number in Mittermeier et al. 1999 book. { n } = Number in Dinnerstein et al., 1995 map

Tropical Moist Broadleaf Forests

  • (21)

    Oaxacan Moist Forests {7}

  • (15)

    Yucatan Moist Forests {9}

  • (14)

    Tehuantepec Moist Forests {8}

(13) Belizean Swamp Forests

{12}

(marginally mapped for Mexico present in the Xcalak Península, Q. Roo)

(12) Sierra Madre Moist Forests {10}

(11) Central America Montane Forests {11}

Tropical Dry Broadleaf Forests

  • (31)

    Sinaloan Dry Forest {65}

  • (27)

    Jalisco Dry Forests {67}

  • (26)

    Veracruz Dry Forests {70}

  • (25)

    Tamaulipas/Veracruz Dry Forests {66}

  • (22)

    Oaxacan Dry Forests {69}

  • (20)

    Balsas Dry Forests {68}

  • (16)

    Yucatan Dry Forests {71}

  • ( 7)

    Central American Pacific Dry Forests {72}

20

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