Ecosystem Divisions

Ecosystem Divisions

Alaska, Hawaii, and Puerto Rico divisions...

   120 Tundra Division
         124 Arctic Tundra Province
         125 Bering Tundra (Northern) Province
         126 Bering Tundra (Southern) Province
     M120 Tundra Division - Mountain Provinces
         M121 Brooks Range Tundra--Polar Desert Province
         M125 Seward Peninsula Tundra--Meadow Province
         M126 Ahklun Mountains Tundra--Meadow Province
         M127 Aleutian Oceanic Meadow--Heath Province
   130 Subarctic Division
         131 Yukon Intermontane Plateaus Tayga Forest
         135 Coastal Trough Humid Tayga Province
         139 Upper Yukon Tayga Province
     M130 Subarctic Division - Mountain Provinces
         M131 Yukon Intermontane Plateaus Tayga--Meadow Province
         M135 Alaska Range Humid Tayga--Tundra--Meadow
         M139 Upper Yukon Tayga--Meadow Province
   210 Warm Continental Division
         212 Laurentian Mixed Forest Province
     M210 Warm Continental Division - Mountain Provinces
         M212 Adirondack-New England Mixed Forest--Coniferous Forest--Alpine Meadow Province
   220 Hot Continental Division
         221 Eastern Broadleaf Forest (Oceanic) Province
         222 Eastern Broadleaf Forest (Continental) Province
     M220 Hot Continental Division - Mountain Provinces
         M221 Central Appalachian Broadleaf Forest--Coniferous Forest--Meadow Province
         M222 Ozark Broadleaf Forest--Meadow Province
   230 Subtropical Division
         231 Southeastern Mixed Forest Province
         232 Outer Coastal Plain Mixed Forest Province
         234 Lower Mississippi Riverine Forest Province
     M230 Subtropical Division - Mountain Provinces
         M231 Ouachita Mixed Forest--Meadow Province
   240 Marine Division
         242 Pacific Lowland Mixed Forest Province
     M240 Marine Division - Mountain Provinces
         M242 Cascade Mixed Forest--Coniferous Forest--Alpine Meadow Province
   250 Prairie Division
         251 Prairie Parkland (Temperate) Province
         255 Prairie Parkland (Subtropical) Province
   260 Mediterranean Division
         261 California Coastal Chaparral Forest and Shrub Province
         262 California Dry Steppe Province
         263 California Coastal Steppe, Mixed Forest, and Redwood Forest Province
     M260 Mediterranean Division - Mountain Provinces
         M261 Sierran Steppe--Mixed Forest--Coniferous Forest--Alpine Meadow Province
         M262 California Coastal Range Open Woodland--Shrub--Coniferous Forest--Meadow Province
   310 Tropical/Subtropical Steppe Division
         311 Great Plains Steppe and Shrub Province
         313 Colorado Plateau Semidesert Province
         315 Southwest Plateau and Plains Dry Steppe and Shrub Province
     M310 Tropical/Subtropical Steppe Division - Mountain Provinces
         M313 Arizona-New Mexico Mountains Semidesert-Open Woodland--Coniferous Forest--Alpine Meadow Province
   320 Tropical/Subtropical Desert Division
         321 Chihuahuan Semidesert Province
         322 American Semidesert and Desert Province
   330 Temperate Steppe Division
         331 Great Plains-Palouse Dry Steppe Province
         332 Great Plains Steppe Province
   340 Temperate Desert Division
         M331 Southern Rocky Mountain Steppe--Open Woodland--Coniferous Forest--Alpine Meadow Province
     M340 Temperate Desert Division - Mountain Provinces
         M341 Nevada-Utah Mountains Semidesert--Coniferous Forest--Alpine Meadow Province
         341 Intermountain Semidesert and Desert Province
         342 Intermountain Semidesert Province
   410 Savanna Division
         411 Everglades Province
     M410 Savanna Division - Mountain Provinces
         M411 Puerto Rico Province
   420 Rainforest Division
     M420 Rainforest Division - Mountain Provinces
         M423 Hawaiian Islands Province


Appendix1 - Regional climates, based on the Koppen system of classification (1931)

Appendix 2 - Climate diagrams of representative climate stations

Appendix 3 - Approximate area and proportionate extent of ecoregions at the province level in the United States

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Date last modified: December 7, 2015